{"title":"Apochromatic Refractors","description":null,"products":[{"product_id":"explore-scientific-ed80-fcd100-series-triplet-apo-refractor","title":"Explore Scientific ED80-FCD100 Series Triplet APO Refractor","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eApochromatic Triplet Refractor\u003c\/li\u003e\n\u003cli\u003eGenuine HOYA FCD100 ED Glass\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Optical Design\u003c\/li\u003e\n\u003cli\u003eProprietary EMD Multi-Layer Coatings\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty Hexagonal Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific ED80-FCD100 Series Triplet APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED80-FCD100 Series Triplet APO Refractor uses an air-spaced triplet optical design with genuine HOYA FCD100 extra-low dispersion glass to deliver exceptional chromatic aberration correction. This design produces true-to-life color fidelity and sharp, high-contrast views of everything from fine lunar details to deep-sky objects. Its proprietary EMD multi-layer coatings further optimize light transmission for brilliant, clear images across the entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eApochromatic Triplet Optics with HOYA FCD100 Glass\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the ED80 is an air-spaced triplet lens assembly featuring HOYA FCD100 glass, a material with optical properties comparable to the highly-regarded Ohara FPL-53. This apochromatic design virtually eliminates chromatic aberration, preventing false color fringing around bright objects like Jupiter and bright stars. The result is a pure, high-contrast image with accurate color rendition, allowing you to see subtle planetary details and resolve tight double stars with confidence.\u003c\/p\u003e\n\u003cp\u003eTo maximize image brightness, all optical surfaces receive Explore Scientific's Enhanced Multilayer Deposition (EMD) coatings. These specialized coatings are designed to boost light transmission, ensuring that the faintest wisps of nebulosity and distant galaxies reach your eye or camera sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHeavy-Duty Hexagonal Focuser for Astrophotography\u003c\/h3\u003e\n\u003cp\u003eDesigned for the demands of imaging, the ED80-FCD100 is equipped with a rugged hexagonal focuser. This robust design provides a stable, flex-free platform for camera payloads, capable of supporting a full imaging train including a DSLR or dedicated astronomy camera, filter wheel, and off-axis guider. The focuser action is smooth and precise, allowing for critical focus adjustments necessary for high-resolution planetary and deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Versatile Grab-and-Go or Guiding Instrument\u003c\/h3\u003e\n\u003cp\u003eThe compact and lightweight nature of the ED80-FCD100 makes it an exceptional \"grab-and-go\" telescope for quick observing sessions or travel to dark-sky sites. While its portable design is a key advantage, it doesn't sacrifice optical integrity, serving as a high-end primary instrument. This portability also makes it a superb choice as a guide scope, mounting easily alongside a larger primary telescope to provide precise guiding for long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Explore Scientific ED80-FCD100 an \"Apochromatic\" (APO) refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn apochromatic refractor brings three wavelengths of light (red, green, and blue) to the same focal point. The \u003cstrong\u003eExplore Scientific ED80-FCD100\u003c\/strong\u003e achieves this using a three-element (triplet) lens design that incorporates a special lens made from \u003cstrong\u003eHOYA FCD100 extra-low dispersion (ED) glass\u003c\/strong\u003e. This virtually eliminates chromatic aberration, or false color, resulting in significantly sharper, higher-contrast images than standard achromatic refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HOYA FCD100 glass in the ED80-FCD100 perform?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD100 is a premium optical glass known for its extremely low dispersion properties, which are critical for color correction. Its performance is widely considered to be on par with Ohara's FPL-53 glass, another benchmark material for high-end apochromatic refractors. This allows the ED80-FCD100 to deliver views with true-to-life color and excellent contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the focuser on the ED80-FCD100 suitable for astrophotography with a DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The telescope features a heavy-duty hexagonal focuser specifically designed to handle the weight of an astrophotography setup. It provides a rigid and stable platform that prevents sagging or flexure, even with a DSLR, filter wheel, or dedicated astronomy camera attached, ensuring your focus remains sharp throughout an imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Explore Scientific ED80-FCD100 be used for both visual observing and imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The ED80-FCD100 is designed as a versatile, high-end instrument. Its superb color correction and contrast make it a joy for visual observation of the Moon, planets, and bright deep-sky objects. At the same time, its robust focuser and clean optics make it an excellent astrophotography platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the ED80-FCD100 perform visually on a target like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eOn the Orion Nebula (M42), the ED80-FCD100's apochromatic optics would provide a high-contrast view with pinpoint stars. The lack of chromatic aberration means the bright stars of the Trapezium cluster at the nebula's core would resolve cleanly without distracting purple halos. You could expect to see fine details and structure within the nebulosity against a dark sky background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ED80-FCD100 as a guide scope on a larger SCT for imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the ED80-FCD100 is an excellent choice for a high-quality guide scope. Its lightweight and compact design make it easy to mount on a larger instrument, like a Schmidt-Cassegrain Telescope (SCT). When paired with a guide camera, its sharp optics will provide the precise tracking necessary for long-exposure images of large targets like the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e8122570176076\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207371037,"sku":"ES-FCD100-0806-02","price":1567.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-ED80-FCD100-Series-Air-Spaced-Triplet-Refractor-FCD100-0806-01-FCD100-0806-01-1__55037.1594240386.1280.1280.jpg?v=1684339015"},{"product_id":"explore-scientific-ed102-fcd100-series-triplet-apo-refractor","title":"Explore Scientific ED102-FCD100 Series Triplet APO Refractor","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm Aperture\u003c\/li\u003e\n\u003cli\u003e714mm Focal Length (f\/7)\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Design\u003c\/li\u003e\n\u003cli\u003eGenuine HOYA FCD100 ED Glass Element\u003c\/li\u003e\n\u003cli\u003e2.5\" HEX Focuser with 10 lb Capacity\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific ED102-FCD100 Series Triplet APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED102-FCD100 Series Triplet APO Refractor combines a 102mm aperture with a 714mm focal length for a versatile f\/7 optical system that excels at both wide-field imaging and high-magnification visual work. Its air-spaced triplet objective uses genuine HOYA FCD100 glass to deliver textbook color correction, while the robust 2.5\" HEX focuser supports imaging payloads up to 10 lbs on an optical tube assembly that weighs only 12 lbs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 102mm Triplet with FCD100 Glass: True Apochromatic Correction\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the ED102 is an air-spaced triplet objective featuring a genuine HOYA FCD100 extra-low dispersion (ED) glass element. This design achieves a true apochromatic level of performance, virtually eliminating the chromatic aberration (false color) that can plague simpler doublet designs. The result is a pristine, high-contrast view with pinpoint stars on a black background and no distracting purple halos around bright objects like Jupiter or Vega.\u003c\/p\u003e\n\u003cp\u003eAll optical surfaces receive Explore Scientific's proprietary EMD (Enhanced Multilayer Deposition) coatings to maximize light transmission and contrast. This ensures that the subtle coloration of planetary cloud bands and the faint, wispy details in nebulae are rendered with stunning fidelity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: A 2.5\" Focuser and 12 lb Portability\u003c\/h3\u003e\n\u003cp\u003eBuilt for astrophotography, the ED102 is equipped with a heavy-duty 2.5\" hexagonal rack-and-pinion focuser. This rigid design prevents flexure and slippage even when carrying a 10 lb imaging train consisting of a camera, filter wheel, and off-axis guider. The smooth, dual-speed controls allow for precise focus adjustments critical for capturing sharp stellar images.\u003c\/p\u003e\n\u003cp\u003eThe entire optical tube assembly weighs a manageable 12 lbs, making it an ideal \"grab-and-go\" instrument on a mid-sized equatorial mount. Its compact form factor also allows it to serve as a premium, large-aperture guide scope or a secondary imaging scope mounted alongside a larger instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWhy a Triplet? The ED102-FCD100 vs. Standard ED Doublets\u003c\/h3\u003e\n\u003cp\u003eWhile a standard ED doublet refractor provides a significant step up from an achromat, it still exhibits a degree of residual false color. The Explore Scientific ED102-FCD100's third lens element, made from high-refractive-index glass, is specifically engineered to correct this remaining chromatic aberration. This provides a distinct advantage for imagers and discerning visual observers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Astrophotography:\u003c\/strong\u003e The triplet design produces smaller, tighter star images with no blue or violet bloat. This allows for more accurate color data acquisition and results in images with higher resolution and better overall aesthetics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFor Visual Observing:\u003c\/strong\u003e On the lunar limb or the cloud tops of Jupiter, the triplet's superior color correction delivers a sharper, higher-contrast image. The absence of color fringing makes it easier to resolve fine details at high magnification.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Explore Scientific ED102-FCD100's triplet design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eair-spaced triplet objective with HOYA FCD100 glass\u003c\/strong\u003e in the ED102-FCD100 provides a higher level of color correction than standard ED doublets. This third lens element virtually eliminates chromatic aberration, resulting in sharper stars, higher contrast, and more faithful color rendition, which is especially critical for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does HOYA FCD100 glass in the ED102 refractor compare to FPL-53?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD100 is an extremely high-quality extra-low dispersion glass with optical properties comparable to Ohara's renowned FPL-53. Both are considered premier glasses for apochromatic refractors, offering exceptional correction of false color for pristine, high-contrast images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the 2.5\" HEX focuser on the ED102-FCD100 handle a full imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e2.5\" hexagonal rack-and-pinion focuser\u003c\/strong\u003e is specifically designed for imaging. It has a stated capacity of \u003cstrong\u003e10 lbs\u003c\/strong\u003e, which is more than sufficient to support a typical setup including a cooled astronomy camera, a filter wheel, and an off-axis guider without sagging or focus shift.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is needed for the Explore Scientific ED102-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith an optical tube weight of only \u003cstrong\u003e12 lbs\u003c\/strong\u003e, the ED102-FCD100 is quite versatile. For visual use, a mount in the Celestron AVX or Sky-Watcher HEQ5 class is ideal. For serious astrophotography, stepping up to a mount with a 30-40 lb payload capacity, such as a Celestron CGEM II or Sky-Watcher EQ6-R Pro, is recommended to ensure stability and precise tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the ED102-FCD100 perform on planetary targets like Jupiter from the city?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ED102-FCD100 is an excellent planetary telescope, even from light-polluted areas. Its apochromatic optics deliver a high-contrast image, allowing you to easily resolve Jupiter's main cloud belts, the Great Red Spot, and the shadows of its Galilean moons. The \u003cstrong\u003e714mm focal length\u003c\/strong\u003e provides ample magnification with standard eyepieces or a Barlow lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the f\/7 focal ratio of the ED102-FCD100 good for imaging large nebulae like the Veil Nebula (NGC 6960)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe f\/7 focal ratio of the ED102 is a versatile sweet spot. It is fast enough to capture significant signal on nebulae in a reasonable time, while the \u003cstrong\u003e714mm focal length\u003c\/strong\u003e provides a field of view that can frame large targets like the Veil Nebula or the Andromeda Galaxy (M31) with most modern astronomy cameras. For even wider fields, a dedicated focal reducer can be added.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e102mm (4\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e714mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD100 ED Element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multilayer Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" Dual-Speed Hexagonal Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Capacity\u003c\/td\u003e\n\u003ctd\u003e10 lbs (4.5 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e12 lbs (5.4 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017614\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207436573,"sku":"ES-FCD100-10207-02","price":2379.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-ED102-FCD100-Series-Air-Spaced-Triplet-Refractor-Telescope-FCD100-10207-01-FCD100-10207-01-1__31373.1594240388.1280.1280.jpg?v=1684339028"},{"product_id":"explore-scientific-ed102-fcd100-series-triplet-telescope-carbon-fiber","title":"Explore Scientific ED102-FCD100 Series Triplet Telescope - Carbon Fiber","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e102mm Aperture\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003ePremium HOYA FCD100 ED Glass\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Optical Tube Assembly\u003c\/li\u003e\n\u003cli\u003e2.5\" Hexagonal Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific ED102-FCD100 Series Triplet Telescope - Carbon Fiber\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED102-FCD100 Carbon Fiber telescope combines a 102mm air-spaced triplet objective with premium HOYA FCD100 glass to deliver true apochromatic views, free of false color. Its lightweight carbon fiber construction and robust 2.5\" HEX focuser create a portable and exceptionally stable platform for high-resolution astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eApochromatic Triplet Optics: 102mm of FCD100 Glass\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the ED102-FCD100 is a 102mm air-spaced triplet objective. This design uses three lenses to bring all visible wavelengths to a single, sharp focus. The inclusion of a genuine HOYA FCD100 ED (Extra-low Dispersion) glass element virtually eliminates chromatic aberration, resulting in images with pinpoint stars on a black background and high-contrast details on planetary surfaces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe ED102's Carbon Fiber Advantage: Lightweight and Thermally Stable\u003c\/h3\u003e\n\u003cp\u003eThe carbon fiber tube reduces the overall weight of the optical tube assembly, making it easier to transport and compatible with a wider range of mid-sized equatorial mounts. Beyond weight savings, carbon fiber's low coefficient of thermal expansion means the telescope holds focus more reliably during long imaging sessions as ambient temperatures drop, a critical advantage for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eHeavy-Duty Imaging: The 2.5\" HEX Focuser\u003c\/h3\u003e\n\u003cp\u003eTo handle modern imaging trains, the ED102-FCD100 is equipped with a rigid 2.5\" hexagonal rack-and-pinion focuser. This design prevents the flexure and image shift that can plague lesser focusers when loaded with a heavy DSLR, cooled CMOS camera, filter wheel, and off-axis guider. The result is a solid, repeatable focusing mechanism that can carry a heavy payload without compromise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eED102 FCD100 Triplet vs. a 102mm ED Doublet: Color Correction\u003c\/h3\u003e\n\u003cp\u003eWhile a high-quality ED doublet refractor is a capable instrument, it is often more affordable and lighter than a triplet. However, the ED102-FCD100's triplet design provides a superior level of color correction. The third lens element allows for a more precise convergence of the light paths, especially in the challenging blue-violet end of the spectrum. For an imager or visual observer, this means:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Chromatic Aberration:\u003c\/strong\u003e Bright stars like Vega or Sirius resolve as sharp points without any distracting purple halos.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Contrast:\u003c\/strong\u003e By eliminating unfocused violet light that can wash out an image, subtle details like the Cassini Division in Saturn's rings or faint dust lanes in galaxies become more visible.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the main advantages of the Explore Scientific ED102-FCD100's carbon fiber tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe carbon fiber tube offers two key benefits. First, it is \u003cstrong\u003esignificantly lighter\u003c\/strong\u003e than an equivalent aluminum tube, making the telescope easier to handle and placing less strain on your mount. Second, it has \u003cstrong\u003esuperior thermal stability\u003c\/strong\u003e, meaning it expands and contracts very little with temperature changes, which helps maintain sharp focus during long astrophotography sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HOYA FCD100 glass in the ED102 triplet improve images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD100 is a premium Extra-low Dispersion (ED) glass that has optical properties very similar to fluorite. In the ED102's triplet lens design, it is the key element responsible for \u003cstrong\u003eeliminating chromatic aberration\u003c\/strong\u003e (false color). This results in razor-sharp stars, higher contrast, and true-to-life colors, which is essential for both high-resolution imaging and critical visual observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 2.5\" HEX focuser on the ED102-FCD100 suitable for a full astrophotography setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The 2.5\" HEX focuser is specifically designed to support the weight of a heavy imaging train. Its hexagonal drawtube and rack-and-pinion mechanism prevent sagging and flexure, ensuring that your camera, filter wheel, and guider remain perfectly aligned with the optical axis. This rigidity is crucial for achieving sharp, round stars across the entire image frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Explore Scientific ED102-FCD100 perform on a bright target like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe ED102-FCD100 will provide exceptional views of the Orion Nebula (M42). Its apochromatic optics will render the stars of the Trapezium cluster as distinct, pinpoint diamonds of light without any color fringing. You will be able to resolve the delicate structures and wisps of nebulosity with high contrast against a dark sky background, making it an ideal instrument for both viewing and imaging this deep-sky showpiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the ED102-FCD100 for high-magnification planetary viewing of Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the ED102-FCD100 is an excellent planetary telescope. Its freedom from chromatic aberration allows you to push the magnification high on nights of good seeing. You can expect to see fine details like the cloud bands and Great Red Spot on Jupiter, and the Cassini Division in Saturn's rings, with crisp, high-contrast views.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is recommended for the Explore Scientific ED102-FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use, a medium-duty alt-azimuth mount would be sufficient. For astrophotography, a mid-sized German Equatorial Mount (GEM) with GoTo capability is recommended to handle the telescope and associated imaging gear. Look for mounts in the payload class of the Celestron AVX, Sky-Watcher EQ6-R Pro, or iOptron CEM40 for stable, long-exposure imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257018420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207469341,"sku":"ES-FCD100-10207-CF-01","price":2659.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-ED102-FCD100-Series-Air-Spaced-Triplet-Telescope-in-Carbon-Fiber-FCD100_25E2_2580_259310207-CF-FCD100-10207-CF-1__24574.1594240388.1280.1280.jpg?v=1684339033"},{"product_id":"explore-scientific-fcd100-series-127mm-f-7-5-triplet-apo-refractor-aluminum-with-2-5-hex-focuser","title":"Explore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Aluminum with 2.5\" HEX Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e127mm (5\") Aperture\u003c\/li\u003e\n\u003cli\u003ef\/7.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003eHOYA FCD100 ED Glass Element\u003c\/li\u003e\n\u003cli\u003e2.5\" Hexagonal Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Aluminum with 2.5\" HEX Focuser\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor combines a large, diffraction-limited objective with premium optical materials to deliver pristine, high-contrast images. Its air-spaced triplet lens and robust 2.5\" HEX focuser create an exceptional platform for both demanding visual observation and advanced astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e127mm FCD100 Triplet Optics: Apochromatic Views at f\/7.5\u003c\/h3\u003e\n\u003cp\u003eAt the heart of this refractor is a 127mm air-spaced triplet objective featuring genuine HOYA FCD100 glass. This extra-low dispersion (ED) element virtually eliminates chromatic aberration, resulting in images free of false color and purple fringing around bright stars and planetary limbs. Combined with Explore Scientific's EMD enhanced multi-layer coatings, the optical system delivers maximum light transmission for brilliant, true-to-life views.\u003c\/p\u003e\n\u003cp\u003eThe f\/7.5 focal ratio provides a versatile balance, offering enough magnification for fine details on Jupiter's cloud bands and Saturn's rings while remaining wide enough to frame many deep-sky targets. Stars resolve to sharp, pinpoint dots against a dark sky, revealing subtle structures in nebulae and galaxies that lesser optics would smear.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2.5\" HEX Focuser: A Smooth and Stable Imaging Platform\u003c\/h3\u003e\n\u003cp\u003eThe telescope includes a rigid 2.5\" hexagonal rack-and-pinion focuser designed to prevent flexure and slippage, even with heavy camera setups. This design offers greater stability than conventional Crayford focusers, ensuring your imaging train remains securely aligned throughout a long exposure. The smooth, precise motion allows for critical focus adjustments necessary for high-resolution planetary imaging and sharp deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 127mm Tube Assembly: Integrated for Field Use\u003c\/h3\u003e\n\u003cp\u003eThe aluminum optical tube is engineered for both durability and portability. It incorporates several features designed for practical use in the field, minimizing setup time and improving your observing sessions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable Dew Shield:\u003c\/strong\u003e An integrated dew shield slides forward to prevent moisture from forming on the objective lens and blocks stray light from degrading image contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCradle Rings \u0026amp; Handle:\u003c\/strong\u003e The included cradle ring assembly provides a secure mounting point and features a top-mounted handle, making the 127mm optical tube easy to carry and mount.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVixen-Style Dovetail:\u003c\/strong\u003e A standard V-style dovetail plate ensures compatibility with a wide range of common astronomical mounts right out of the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFCD100 vs. FPL-53 Glass: The Apochromatic Difference\u003c\/h3\u003e\n\u003cp\u003eIn the world of apochromatic refractors, two glass types stand out for their exceptional color correction: Ohara FPL-53 and HOYA FCD100. Both are elite extra-low dispersion glasses that allow optical designers to bring the entire visual spectrum to a single, sharp focus point. Choosing between them is less about one being superior and more about the specific optical design it enables.\u003c\/p\u003e\n\u003cp\u003eBy using FCD100 in this 127mm triplet, Explore Scientific achieves a level of apochromatic correction that produces textbook-perfect star images and neutral color rendition. For an observer, this means the highest possible contrast and sharpness that the 127mm aperture can deliver, uncompromised by distracting chromatic aberration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Explore Scientific FCD100 127mm APO perform on planets like Jupiter and Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis telescope excels at planetary observation. The 127mm aperture resolves fine details, while the apochromatic FCD100 optics ensure maximum contrast without false color. You can expect to clearly see Jupiter's main cloud bands, the Great Red Spot, and the Cassini Division in Saturn's rings under steady seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Explore Scientific 127mm Triplet suitable for imaging a large nebula like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will likely need a focal reducer. At its native f\/7.5 focal ratio, the telescope is well-suited for smaller nebulae and galaxies. To fit very large objects like the North American Nebula or the Andromeda Galaxy (M31) into a single frame, adding a 0.7x or 0.8x reducer\/flattener is recommended to widen the field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Explore Scientific FCD127 APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use, a medium-duty equatorial mount like a Celestron AVX or Sky-Watcher HEQ5 is sufficient. For astrophotography, a more robust mount in the payload class of a Sky-Watcher EQ6-R Pro or Celestron CGX is strongly recommended to ensure stability for long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 2.5\" HEX focuser on the FCD100 127mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 2.5\" HEX focuser uses a hexagonal drawtube and a rack-and-pinion mechanism. This design is significantly more rigid than typical Crayford focusers, preventing tilt or flex when loaded with a heavy camera, filter wheel, and off-axis guider. It ensures your entire imaging train remains perfectly orthogonal to the light path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does HOYA FCD100 glass compare to FPL-53 in this refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eHOYA FCD100 and Ohara FPL-53 are considered functional equivalents in their ability to correct for chromatic aberration. Both are premier ED glass types that, when used in a triplet objective lens design, produce a true apochromatic image with virtually no color fringing. The FCD100 glass in this 127mm refractor ensures it delivers performance on par with other premium APOs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2\" eyepieces and accessories with the Explore Scientific 127mm FCD100?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 2.5\" focuser terminates with a standard 2\" adapter, allowing you to use any 2\" diagonal, eyepiece, or imaging accessory. A 1.25\" adapter is also typically included for use with smaller format eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromatic Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e127mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD100 ED Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" Hexagonal Rack-and-Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017621\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207829789,"sku":"ES-FCD100-127075-02","price":3499.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-FCD100-Series-127mm-f-7-5-Aluminum-Air-Spaced-Triplet-ED-APO-Refractor-with-2-5-inch-HEX-Focuser-FCD100-127075-01-1__30104.1594240394.1280.1280.jpg?v=1684338887"},{"product_id":"explore-scientific-fcd100-series-127mm-f-7-5-triplet-apo-refractor-carbon-fiber-with-2-5-hex-focuser","title":"Explore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Carbon Fiber with 2.5\" HEX Focuser","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e127mm Aperture\u003c\/li\u003e\n\u003cli\u003ef\/7.5 Focal Ratio \/ 952mm Focal Length\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromat with FCD100 Glass\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Optical Tube\u003c\/li\u003e\n\u003cli\u003e2.5\" HEX Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eExplore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor - Carbon Fiber with 2.5\" HEX Focuser\u003c\/h2\u003e\n      \u003cp\u003eThe Explore Scientific FCD100 Series 127mm f\/7.5 Triplet APO Refractor combines a 952mm focal length with an air-spaced triplet optical system for high-contrast planetary and deep-sky imaging. Its 2.5\" HEX focuser delivers rigid, precise control over the focal plane, while the premium HOYA FCD100 ED glass element ensures true apochromatic correction.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 127mm FCD100 Triplet: Apochromatic Correction\u003c\/h3\u003e\n      \u003cp\u003eThe heart of this refractor is its 127mm air-spaced triplet objective, which uses a genuine HOYA FCD100 ED glass element to achieve true apochromatic correction. This design brings all wavelengths of light to a single focal point, virtually eliminating the chromatic aberration seen as purple fringing in lesser instruments. The result is pinpoint stars on a black background and high-contrast detail on planets like Saturn and Jupiter, all enhanced by EMD coatings for maximum light transmission.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCarbon Fiber OTA: Thermal Stability at f\/7.5\u003c\/h3\u003e\n      \u003cp\u003eThe optical tube is constructed from carbon fiber, a material chosen for its high strength-to-weight ratio and low coefficient of thermal expansion. This ensures the 952mm focal length remains stable during long imaging sessions on cooling nights, minimizing the need for refocusing. The lightweight construction makes this 127mm aperture manageable, though it still requires a medium-class equatorial mount for stability.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003e2.5\" HEX Focuser: Heavy Imaging Payloads\u003c\/h3\u003e\n      \u003cp\u003eAstrophotography with heavy imaging trains requires a focuser that won't slip or tilt. The 2.5\" hexagonal rack-and-pinion design meets this demand, ensuring zero image shift and repeatable, precise focus adjustments. This robust construction is essential when using large format cameras, filter wheels, and off-axis guiders.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Explore Scientific 127mm FCD100 refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Explore Scientific 127mm FCD100 is a substantial optical tube and requires a robust equatorial mount for stable imaging. A mount in the 40-50 lb payload capacity class, such as an Explore Scientific EXOS-2GT or Sky-Watcher EQ6-R Pro, is recommended. The specific mounting plate is not listed as an included accessory, so you must ensure you have the correct dovetail bar for your mount.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the FCD100 glass in this 127mm refractor compare to FPL-53?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003e\u003cstrong\u003eHOYA FCD100\u003c\/strong\u003e is optically equivalent to Ohara's FPL-53, one of the most respected extra-low dispersion (ED) glasses available. Both are considered premium materials for building triplet objectives that achieve apochromatic correction. The final color correction depends on the entire optical design, but FCD100 glass places this telescope in the top tier of refractors.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat can I expect to see of the Orion Nebula (M42) with the Explore Scientific 127mm FCD100?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eWith its 127mm aperture and apochromatic optics, you will resolve fine detail within the Orion Nebula (M42). The Trapezium cluster at its heart will be cleanly split into its four primary stars, and the faint, nebulous \"wings\" of the nebula will show intricate structure and excellent contrast against a dark sky background.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 952mm focal length of the ES 127mm FCD100 a good match for imaging Andromeda (M31) with an APS-C sensor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe 952mm focal length provides an excellent image scale for many deep-sky objects. While the Andromeda Galaxy (M31) is exceptionally large, this focal length will perfectly frame its bright core and extensive dust lanes on a typical APS-C sensor. To capture the full extent of M31 in a single frame, a focal reducer would be required.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the carbon fiber tube on the Explore Scientific 127mm FCD100 important for astrophotography?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eCarbon fiber has a very low coefficient of thermal expansion. This means that as the ambient temperature drops overnight, the telescope tube does not shrink significantly, which keeps the focal point stable. This minimizes focus shift during a long imaging session, resulting in sharper stars from start to finish.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat accessories do I need to start using the Explore Scientific 127mm FCD100 refractor?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThis product is an optical tube assembly (OTA) only. At a minimum, you will need a mount, a diagonal, eyepieces for visual use, and a finder scope. The manufacturer does not specify any included accessories, so you should plan on supplying all necessary components to complete your telescope setup.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e127mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.5\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e952mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD100 ED\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" Dual-Speed HEX Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eTube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eEMD (Enhanced Multilayer Deposition)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e812257017812\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eExplore Scientific 127mm FCD100 Carbon Fiber OTA\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207862557,"sku":"ES-FCD100-127075-CF-01","price":3919.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Explore-Scientific-FCD100-Series-127mm-f-7-5-Carbon-Fiber-Triplet-ED-APO-Refractor-Telescope-with-2-5-inch-HEX-Focuser-FCD100-127075-CF-1__10510.1594240395.1280.1280.jpg?v=1684338893"},{"product_id":"explore-scientific-ed152-triplet-in-carbon-fiber","title":"Explore Scientific ED152 Triplet in Carbon Fiber","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e152mm (6\") Aperture\u003c\/li\u003e\n\u003cli\u003ef\/8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003eHOYA FCD1 Extra-Low Dispersion Glass\u003c\/li\u003e\n\u003cli\u003eCarbon Fiber Optical Tube\u003c\/li\u003e\n\u003cli\u003e20.5 lbs Optical Tube Assembly Weight\u003c\/li\u003e\n\u003cli\u003e3.3\" Dual-Speed Focuser\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eExplore Scientific ED152 Triplet in Carbon Fiber\u003c\/h2\u003e\n\u003cp\u003eThe Explore Scientific ED152 Triplet combines a large 152mm aperture with an f\/8 optical system to deliver high-contrast, color-pure images for serious observers and astrophotographers. Its air-spaced triplet design incorporates genuine HOYA FCD1 glass to virtually eliminate chromatic aberration, while the advanced carbon fiber tube reduces the total weight to a remarkable 20.5 lbs. This instrument gathers 44% more light than a 127mm refractor, providing the resolving power needed for detailed planetary observation and deep-sky imaging from a surprisingly manageable platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e152mm f\/8 Triplet Optics: Apochromatic Correction with HOYA FCD1 Glass\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the ED152 is an air-spaced triplet objective lens featuring HOYA FCD1 extra-low dispersion glass. This apochromatic design corrects false color to an exceptional degree, ensuring that bright stars like Vega or Sirius resolve as sharp, white points without distracting purple halos. The f\/8 focal ratio provides a well-corrected field for imaging while keeping the optical tube a practical length, resulting in high-contrast views of lunar rilles, Jupiter's cloud bands, and the faint tendrils of nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCarbon Fiber Construction: A 20.5 lb Six-Inch Refractor\u003c\/h3\u003e\n\u003cp\u003eA six-inch refractor is typically a heavy instrument, but the ED152's carbon fiber tube brings its weight down to just 20.5 lbs. This significant weight reduction makes the telescope compatible with a wider range of mid-sized equatorial mounts, such as the Losmandy G11, reducing the total payload requirement for a stable imaging setup. Carbon fiber also offers superior thermal stability, minimizing focus shift during long imaging sessions as ambient temperature drops.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 3.3\" Focuser and 2\" Diagonal\u003c\/h3\u003e\n\u003cp\u003eEngineered for demanding imaging applications, the ED152 is equipped with a robust 3.3\" focuser. This large-aperture focuser is designed to handle heavy cameras, filter wheels, and off-axis guiders without flexure, ensuring a rigid and reliable optical train. A 2\" diagonal is included for visual use, allowing you to take full advantage of wide-field 2\" eyepieces for sweeping views of the Milky Way or large objects like the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e125% More Light Than an ED102: The Power of a 152mm Aperture\u003c\/h3\u003e\n\u003cp\u003eThe 152mm objective provides a significant jump in light-gathering power over smaller refractors. Compared to the popular 102mm format, the ED152 collects 125% more light, and 44% more than the 127mm model. This light-gathering advantage translates directly to brighter images and shorter exposure times, allowing you to resolve fainter stars in globular clusters like M13 and capture more detail in the spiral arms of distant galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the carbon fiber tube on the ED152 improve performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe carbon fiber tube offers two main advantages. First, it reduces the optical tube's weight to just \u003cstrong\u003e20.5 lbs\u003c\/strong\u003e, making it usable on lighter, more portable equatorial mounts. Second, carbon fiber has a very low coefficient of thermal expansion, which means it resists shrinking or expanding with temperature changes, keeping the focal point stable during long imaging sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Explore Scientific ED152 CF?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGiven its \u003cstrong\u003e20.5 lbs\u003c\/strong\u003e weight, the ED152 Carbon Fiber version works well on mounts with a payload capacity of 40 lbs or more for visual use, and 50 lbs or more for stable astrophotography. Mounts like the Losmandy G11 or similar-class mounts are excellent choices.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the ED152 triplet suitable for planetary viewing of Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The \u003cstrong\u003e152mm\u003c\/strong\u003e apochromatic triplet optics are ideal for high-magnification planetary viewing. The HOYA FCD1 glass provides superb color correction, allowing you to see fine details like Jupiter's Great Red Spot, the Cassini Division in Saturn's rings, and subtle surface shadings on Mars with exceptional contrast and clarity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the advantages of the 152mm aperture for deep-sky objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe large \u003cstrong\u003e152mm\u003c\/strong\u003e aperture gathers significantly more light than smaller refractors (\u003cstrong\u003e125% more\u003c\/strong\u003e than a 102mm), which is crucial for faint deep-sky objects. On the Orion Nebula (M42), this means you'll resolve the Trapezium cluster into more distinct stars and see fainter, more intricate structures within the surrounding gas clouds, both visually and in images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"air-spaced triplet\" mean for the ED152's optics?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \"air-spaced triplet\" refers to an objective lens made of three individual glass elements separated by a thin cushion of air. This design gives optical engineers more variables to work with to correct for chromatic aberration (false color) and other optical errors, resulting in the sharp, high-contrast, apochromatic images the \u003cstrong\u003eED152\u003c\/strong\u003e produces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the HOYA FCD1 glass in the ED152 affect image quality?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eHOYA FCD1\u003c\/strong\u003e is a high-grade, extra-low dispersion (ED) glass that has optical properties similar to fluorite. Its primary function is to bend different colors of light to the same focal point. This drastically reduces chromatic aberration, leading to images that are free from color fringing and have much higher contrast and sharpness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromatic Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e152mm (6\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eHOYA FCD1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Material\u003c\/td\u003e\n\u003ctd\u003eCarbon Fiber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.3\" Dual-Speed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Diagonal\u003c\/td\u003e\n\u003ctd\u003e2\" Dielectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e20.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGTIN\u003c\/td\u003e\n\u003ctd\u003e811803035102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/explore-scientific-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eExplore Scientific Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Explore Scientific","offers":[{"title":"Default Title","offer_id":44967207895325,"sku":"ES-TED15208CF-HEX33","price":5599.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Explore-Scientific-ED152-Air-Spaced-Triplet-in-Carbon-Fiber-TED15208CF-HEXDD3-TED15208CF-HEXDD3-1__94308.1594240396.1280.1280.jpg?v=1684338895"},{"product_id":"william-optics-fluorostar-132","title":"William Optics Fluorostar 132","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e132mm Aperture, 910mm Focal Length (f\/6.9)\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet Apochromatic Objective\u003c\/li\u003e\n\u003cli\u003ePremium FPL-53 Glass for Superior Color Correction\u003c\/li\u003e\n\u003cli\u003eHeavy-Duty 3.7\" Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003e360° Rotatable Focuser for Easy Framing\u003c\/li\u003e\n\u003cli\u003eFully CNC-Machined Aluminum Tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Fluorostar 132 APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Fluorostar 132 combines a 132mm aperture with a 910mm focal length (f\/6.9) to serve as a premier instrument for high-resolution astrophotography and critical visual observation. Its air-spaced triplet objective lens uses premium FPL-53 glass to achieve apochromatic correction, while the massive 3.7-inch Rack \u0026amp; Pinion focuser provides zero-flexure support for full-frame imaging systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e132mm f\/6.9 FPL-53 Triplet: Pure Color Correction\u003c\/h3\u003e\n\u003cp\u003eAt the core of the Fluorostar 132 is a three-element objective lens featuring FPL-53 glass, the gold standard for color error correction. This apochromatic design virtually eliminates chromatic aberration, ensuring there is no spurious purple or green fringing around bright stars like Vega or on the limb of Jupiter. With high-transmission STM coatings, the FLT132 delivers exceptionally high contrast, revealing subtle planetary details and rendering stars as sharp, color-pure points against a black-sky background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3.7\" Rack \u0026amp; Pinion Focuser: 360° of Imaging Precision\u003c\/h3\u003e\n\u003cp\u003eDesigned for the demands of modern astrophotography, the FLT132 is equipped with a heavy-duty 3.7\" rack and pinion focuser. This large-aperture focuser can carry heavy imaging trains—including large-format cameras, filter wheels, and off-axis guiders—without sagging or flexure. For perfect composition, the entire focuser assembly rotates a full 360 degrees, allowing you to frame targets like the North American Nebula (NGC 7000) exactly as you wish without ever loosening your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Robust 132mm OTA with CNC-Machined Precision\u003c\/h3\u003e\n\u003cp\u003eThe optical tube is crafted from solid CNC-machined aluminum, providing a rigid and thermally stable platform essential for consistent focus through long imaging sessions. The powder-painted white tube is durable and presents a classic, clean aesthetic. Every Fluorostar 132 includes a high-quality soft carrying case, protecting your investment during transport to dark-sky sites and making this powerful 132mm refractor surprisingly manageable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFLT132 vs. Standard 130mm Refractors: The 3.7\" Focuser Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile many refractors in the 130mm class deliver excellent optical views, the Fluorostar 132 sets itself apart with its imaging-centric design, most notably its focuser.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTypical Refractors:\u003c\/strong\u003e Many competitors use 2.5\" or 3\" focusers, which are adequate for smaller sensors but can become a bottleneck for flexure and illumination with larger cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFluorostar 132:\u003c\/strong\u003e The 3.7\" focuser provides a wider, unvignetted light path for full-frame and larger sensors, especially when paired with a compatible reducer or flattener. Its robust build quality means you can invest in a heavy imaging setup without needing to budget for an immediate focuser upgrade.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Fluorostar 132 perform on planetary targets like Jupiter with its 910mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eWilliam Optics Fluorostar 132\u003c\/strong\u003e is an excellent planetary instrument. Its 910mm focal length provides ample image scale for planets, and the FPL-53 triplet optics deliver the high-contrast, color-free views needed to resolve fine details like Jupiter's Great Red Spot, cloud bands, and the Cassini Division in Saturn's rings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the FLT132 suitable for imaging large deep-sky objects like the Andromeda Galaxy (M31) with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. At its native 910mm focal length, the FLT132 will frame the core of M31 beautifully. When paired with a compatible field flattener or reducer, it provides a flat, well-corrected field for full-frame sensors. The large 3.7\" focuser is specifically designed to prevent vignetting and support the weight of a full-frame imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the FPL-53 triplet objective in the Fluorostar 132 superior to a doublet?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003etriplet objective\u003c\/strong\u003e with \u003cstrong\u003eFPL-53 glass\u003c\/strong\u003e corrects for chromatic aberration (false color) across a much wider spectrum than a standard doublet. This results in significantly higher contrast, sharper stars with no color fringing, and more faithful color rendition in astrophotos, which is especially critical for imaging and observing bright objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 3.7\" focuser on the William Optics FLT132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e3.7\" Rack \u0026amp; Pinion focuser\u003c\/strong\u003e offers two main advantages for astrophotography:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Payload Capacity:\u003c\/strong\u003e It can hold heavy cameras, filter wheels, and other accessories without flexing or slipping, ensuring consistent focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Illumination:\u003c\/strong\u003e The large diameter prevents vignetting (darkening of the corners) on large camera sensors, such as full-frame DSLRs or dedicated astronomy cameras.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat field flatteners are compatible with the FLT132?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe William Optics Fluorostar 132 is designed to be compatible with several of their high-quality field flatteners and reducers, including the \u003cstrong\u003eP-FLAT68III\u003c\/strong\u003e, \u003cstrong\u003eP-Flat7A\u003c\/strong\u003e, and \u003cstrong\u003eP-Flat8\u003c\/strong\u003e. Using one of these accessories is recommended for astrophotography to ensure pinpoint stars across the entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Fluorostar 132 come with a case for transport?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the William Optics FLT132 includes a high-quality soft carrying case. This padded case is designed to protect the telescope during storage and transport to your observing location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e132mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e910mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Apochromatic Triplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Glass\u003c\/td\u003e\n\u003ctd\u003eFPL-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eSTM Coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.7\" Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Rotation\u003c\/td\u003e\n\u003ctd\u003e360 degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Construction\u003c\/td\u003e\n\u003ctd\u003eCNC-machined Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Flatteners\u003c\/td\u003e\n\u003ctd\u003eP-FLAT68III, P-Flat7A, P-Flat8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Colors\u003c\/td\u003e\n\u003ctd\u003eRed, Gold, Grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFluorostar 132 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red \/ 3.3\" R\u0026P","offer_id":44967227457821,"sku":"WO-A-F132RDIII-RP33R","price":6304.0,"currency_code":"CAD","in_stock":true},{"title":"Red \/ 3.5\" Feather Touch","offer_id":44967227556125,"sku":"WO-A-F132RDIII-FTR","price":8162.0,"currency_code":"CAD","in_stock":true},{"title":"Gold \/ 3.3\" R\u0026P","offer_id":44967227425053,"sku":"WO-A-F132GDIII-RP33R","price":6304.0,"currency_code":"CAD","in_stock":true},{"title":"Gold \/ 3.5\" Feather Touch","offer_id":44967227490589,"sku":"WO-A-F132GDIII-FTR","price":8162.0,"currency_code":"CAD","in_stock":true},{"title":"Grey \/ 3.3\" R\u0026P","offer_id":48966062702877,"sku":"WO-A-F132TGIV-RP37","price":6897.0,"currency_code":"CAD","in_stock":true},{"title":"Grey \/ 3.5\" Feather Touch","offer_id":48966062735645,"sku":"WO-A-F132TGIV-FT","price":8162.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-FLT132-1.jpg?v=1722277044"},{"product_id":"william-optics-fluorostar-156","title":"William Optics Fluorostar 156","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e156mm Aperture Triplet Apochromat\u003c\/li\u003e\n\u003cli\u003e1217mm Focal Length (f\/7.8)\u003c\/li\u003e\n\u003cli\u003eFPL-53 \u0026amp; Lanthanum Glass Elements\u003c\/li\u003e\n\u003cli\u003e3.7\" Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eThermally Stable Steel Objective Cell\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask in Dust Cover\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Fluorostar 156 f\/7.8 Triplet APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Fluorostar 156 combines a large 156mm aperture with a 1217mm (f\/7.8) focal length in a precision-engineered, air-spaced triplet optical system. Featuring premium FPL-53 glass and a Lanthanum element, this apochromatic refractor suppresses false color to undetectable levels, supported by a massive 3.7\" Rack \u0026amp; Pinion focuser for precise, no-slip focusing with heavy imaging payloads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 156mm f\/7.8 Triplet APO: Color-Free Views with FPL-53 Glass\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Fluorostar 156 lies an air-spaced triplet objective that sets the standard for color correction and contrast. By combining a key element of FPL-53 glass with another of Lanthanum, the optical design brings all wavelengths of visible light to a single, sharp focal point. This eliminates the distracting purple fringing seen on bright stars in lesser instruments, delivering crisp, high-contrast views of planetary details and pinpoint stars across the entire field for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThermally Stable Steel Cell: Maintaining Collimation at 156mm\u003c\/h3\u003e\n\u003cp\u003eA large 156mm objective lens is susceptible to subtle shifts as ambient temperature drops, which can degrade image sharpness. William Optics addresses this with a robust steel objective cell that mitigates thermal expansion and contraction. This ensures the triplet lens elements remain in perfect alignment throughout a long imaging session, preserving the exquisite optical correction from dusk until dawn.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: A 3.7\" Focuser and Integrated Bahtinov Mask\u003c\/h3\u003e\n\u003cp\u003eThe Fluorostar 156 is built from the ground up for serious astrophotography. The heavy-duty 3.7\" rack and pinion focuser provides a rigid, stable platform for large cameras and filter wheels, eliminating flexure and focus shift. For achieving perfect focus, the lens cap features an integrated Bahtinov mask—a critical tool for hitting sharp focus in seconds. The entire optical tube is secured by three CNC-machined rings and a standard Losmandy-style dovetail plate, creating a solid foundation for any capable equatorial mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the William Optics Fluorostar 156?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eDue to its aperture and focal length, the Fluorostar 156 is a substantial instrument. A robust equatorial mount with a payload capacity of at least 50-60 lbs (22-27 kg) or more is strongly recommended for stable imaging and visual use. Mounts in the Celestron CGX, Losmandy G11, or Software Bisque Paramount MYT class are appropriate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the FPL-53 and Lanthanum glass in the Fluorostar 156 benefit astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis combination of exotic glass types provides exceptional apochromatic performance. For astrophotography, this means:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Chromatic Aberration:\u003c\/strong\u003e Bright stars like Vega or Sirius will not have distracting blue or purple halos, resulting in cleaner, more natural-looking star fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Contrast:\u003c\/strong\u003e By focusing all colors to the same point, fine details in nebulae and galaxies are not smeared or washed out, leading to sharper and more detailed images.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Spectrographic Use:\u003c\/strong\u003e The clean color correction makes this an excellent instrument for use with narrowband filters (H-alpha, OIII, SII), as stars will be tight and round across all filtered channels.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the integrated Bahtinov mask on the Fluorostar 156?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Bahtinov mask, integrated directly into the dust cover, is a significant convenience for astrophotographers. It creates a distinctive diffraction pattern around a bright star that instantly shows you when you have achieved perfect focus. This eliminates the guesswork of trying to find the point of sharpest focus by eye, saving valuable imaging time and ensuring your data is critically sharp every time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Fluorostar 156 for visual observation as well as imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While optimized for imaging, the Fluorostar 156 is a superb visual instrument. Its 156mm aperture provides brilliant, high-resolution views of the Moon, planets, and deep-sky objects. The apochromatic optics deliver a pure, high-contrast image that is free of false color, making it ideal for discerning subtle cloud bands on Jupiter or resolving tight double stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Fluorostar 156 perform on faint details in the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Fluorostar 156's combination of 156mm aperture and high-contrast optics makes it an exceptional tool for M42. Visually, you can expect to resolve the E and F stars in the Trapezium cluster under good seeing conditions. For imaging, the 1217mm focal length perfectly frames the nebula's core while the sharp optics will capture the faint, intricate structures of the surrounding nebulosity with stunning clarity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 1217mm focal length of the Fluorostar 156 suitable for imaging smaller galaxies like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 1217mm focal length is an excellent match for medium-to-small deep-sky objects like M51, the Hercules Cluster (M13), or the Ring Nebula (M57). It provides enough image scale to resolve spiral arms, dust lanes, and individual stars in globular clusters, especially when paired with a modern astronomy camera with small pixels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e156mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1217mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eAir-Spaced Triplet Apochromat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Composition\u003c\/td\u003e\n\u003ctd\u003eFPL-53 \u0026amp; Lanthanum Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.7\" Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Cell Construction\u003c\/td\u003e\n\u003ctd\u003eSteel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Accent Colors\u003c\/td\u003e\n\u003ctd\u003eRed, Gold, Space Grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFluorostar 156 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e3.7\" Rack \u0026amp; Pinion Focuser\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov Mask Cover\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCNC Tube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 3\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLosmandy-style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":44967228080413,"sku":"WO-A-F156RD-RP37","price":10653.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":44967228014877,"sku":"WO-A-F156GD-RP37","price":12417.0,"currency_code":"CAD","in_stock":true},{"title":"Grey","offer_id":44967228047645,"sku":"WO-A-F156TG-RP37","price":12417.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-FLT156-1.jpg?v=1722277379"},{"product_id":"william-optics-gran-turismo-71-apo-triplet","title":"William Optics Gran Turismo 71 APO Triplet","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e71mm Triplet Apochromatic Lens\u003c\/li\u003e\n\u003cli\u003e419mm Focal Length at f\/5.9\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003e2.5\" Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eOTA Weight: 2.95 kg (6.5 lbs)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Gran Turismo 71 APO Triplet\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Gran Turismo 71 APO Triplet combines a 71mm aperture with a 419mm focal length in a fast f\/5.9 optical design. Its triplet objective lens, featuring FPL-53 glass, delivers sharp, high-contrast images free of false color, illuminating a full-frame 44mm image circle. Weighing just 2.95 kg, the GT71 is engineered for premium wide-field astrophotography on portable, lightweight tracking mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTriplet APO Optics: 419mm at f\/5.9 with FPL-53 Glass\u003c\/h3\u003e\n\u003cp\u003eThe core of the GT71 is its air-spaced triplet apochromatic lens. This design uses an FPL-53 glass element to virtually eliminate chromatic aberration, ensuring star colors are rendered accurately and details are resolved with high contrast. The native 419mm focal length at f\/5.9 provides a versatile field of view, ideal for capturing large nebulae and star clusters while maintaining a manageable image scale for galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 2.5\" R\u0026amp;P Focuser and 44mm Image Circle\u003c\/h3\u003e\n\u003cp\u003eBuilt for modern astrophotography, the Gran Turismo 71 is equipped with a heavy-duty 2.5\" rack-and-pinion focuser. This focuser provides 93mm of travel and can handle heavy imaging trains without slipping, while being directly compatible with electronic focusers like the ZWO EAF. The optical system is designed to produce a flat, well-illuminated 44mm image circle, fully covering full-frame sensors from edge to edge with the addition of an optional flattener.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Compatibility:\u003c\/strong\u003e The 44mm image circle supports Full Frame, APS-C, and M4\/3 sensors, offering flexibility for your current and future cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional Reducers:\u003c\/strong\u003e Choose the FLAT GT 1.0x for edge-to-edge correction at the native 419mm focal length, or the FLAT 6AIII 0.8x reducer to transform the scope into a faster f\/4.7 system for even wider fields.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Angle Adjuster:\u003c\/strong\u003e A 360° camera angle adjuster is included, allowing for precise framing of your target without altering focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eGrab-and-Go Design: 2.95 kg with Vixen\/Arca-Swiss Dovetail\u003c\/h3\u003e\n\u003cp\u003eThe entire optical tube assembly weighs only 2.95 kg (6.5 lbs), making the GT71 an ideal choice for portable setups like the Sky-Watcher Star Adventurer or iOptron SkyGuider Pro. Its adjustable tube length, from 392mm to 470mm, allows for compact storage and travel. The integrated dovetail bar features both a Vixen-style rail for astronomy mounts and an Arca-Swiss profile for direct attachment to standard photographic tripods, adding to its field versatility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the William Optics GT71 be used with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Gran Turismo 71 is designed with a \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to fully illuminate a standard full-frame sensor (typically 43mm diagonal) without vignetting. For optimal edge-of-field star shapes, pairing it with a dedicated flattener like the FLAT GT 1.0x or the FLAT 6AIII 0.8x reducer is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Gran Turismo 71?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith an OTA weight of only \u003cstrong\u003e2.95 kg (6.5 lbs)\u003c\/strong\u003e, the GT71 is exceptionally versatile. It performs well on robust star trackers like the Sky-Watcher Star Adventurer GTi or small equatorial mounts in the EQ3\/EQM-35 class. For more serious imaging with autoguiding, a mount from the HEQ5\/CEM26 class is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the GT71 perform on the North American Nebula (NGC 7000) with the 0.8x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe GT71 is an excellent choice for this target. With the optional \u003cstrong\u003eFLAT 6AIII 0.8x reducer\u003c\/strong\u003e, the focal length becomes approximately 335mm at f\/4.7. Paired with an APS-C sensor, this combination can easily frame the entire North American Nebula and the adjacent Pelican Nebula (IC 5070) in a single shot with high resolution.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the GT71 suitable for visual astronomy on objects like the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While optimized for imaging, the GT71's triplet APO lens provides superb, high-contrast views for visual use. On the Orion Nebula (M42), you can expect sharp, pinpoint stars across the Trapezium cluster and clear views of the surrounding nebulosity. With a low-power, wide-field eyepiece, the \u003cstrong\u003e419mm focal length\u003c\/strong\u003e will frame the entire nebula beautifully.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the GT71's f\/5.9 focal ratio?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAn \u003cstrong\u003ef\/5.9 focal ratio\u003c\/strong\u003e is considered \"fast\" in astronomical terms. This allows the telescope to collect a significant amount of light in a shorter period compared to slower f\/8 or f\/10 systems. For imagers, this means you can capture more signal and detail in your sub-exposures, reducing total integration time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapters are included with the William Optics Gran Turismo 71?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe GT71 includes two visual adapters. The first is an \u003cstrong\u003eM63 to 2\" adapter\u003c\/strong\u003e, allowing you to attach standard 2\" diagonals and eyepieces. The second is a \u003cstrong\u003e2\" to 1.25\" adapter\u003c\/strong\u003e, which steps down the connection to accommodate 1.25\" accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Type\u003c\/td\u003e\n\u003ctd\u003eTriplet APO Prime Lens\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e71 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e419 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.5\" R\u0026amp;P Focuser Compatible with EAF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e93 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Format Support\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptional Flattener\/Reducer\u003c\/td\u003e\n\u003ctd\u003eFLAT GT 1.0x, FLAT 6AIII 0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Type\u003c\/td\u003e\n\u003ctd\u003eVixen \u0026amp; Arca-Swiss Compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e392 mm (retracted) - 470 mm (extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.95 kg \/ 6.5 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eGran Turismo 71 APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM63 to 2\" Visual Back Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Visual Back Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e360° Camera Angle Adjuster (CAA63)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Rings \u0026amp; Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLens Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":44967229260061,"sku":"WO-A-F71GTII-RD","price":1515.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-GT71-1.jpg?v=1722276408"},{"product_id":"william-optics-zenithstar-61ii-apo","title":"William Optics Zenithstar 61II APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e61mm Aperture Apochromatic Doublet Refractor\u003c\/li\u003e\n\u003cli\u003eOhara FPL-53 ED Glass Element\u003c\/li\u003e\n\u003cli\u003eFast f\/5.9 Focal Ratio for Wide-Field Imaging\u003c\/li\u003e\n\u003cli\u003eIncludes Flat61A Field Flattener\u003c\/li\u003e\n\u003cli\u003e2-inch Dual-Speed Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask in Lens Cap\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Zenithstar 61II APO Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Zenithstar 61II APO packages a color-free FPL-53 glass doublet and a precise 2-inch dual-speed focuser into a compact, portable optical tube. Designed as a complete wide-field imaging solution, this f\/5.9 refractor includes the essential Flat61A field flattener, delivering an instrument ready for demanding astrophotography right out of its included soft case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFPL-53 APO Doublet for Apochromatic Imaging\u003c\/h3\u003e\n\u003cp\u003eAt the core of the Zenithstar 61II is an air-spaced doublet objective featuring a genuine Ohara FPL-53 ED glass element. This apochromatic design virtually eliminates chromatic aberration, ensuring stars are rendered as sharp, high-contrast points of light without distracting purple fringing. The result is cleaner raw data with truer color fidelity, whether you're imaging emission nebulae or capturing the subtle hues in a star cluster.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eField-Ready Portability and CNC Mechanicals\u003c\/h3\u003e\n\u003cp\u003eEngineered for the traveling imager, the Z61II is built from CNC-machined aluminum for a rigid yet lightweight frame that holds collimation. The scope includes a Vixen-style dovetail for compatibility with a wide range of popular mounts, and a unique saddle handle bar that simplifies transport while also serving as a mounting point for guide scopes or other accessories. A custom-fit soft carrying case protects the instrument during travel to your favorite dark-sky site.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready with a 2-Inch Focuser and Flat61A Flattener\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics delivers the Z61II as a complete imaging system, not just an optical tube. The 2-inch dual-speed focuser provides the fine adjustment needed for critical focus, a process made simple by the Bahtinov mask cleverly integrated into the lens cap. Crucially, the package includes the matched Flat61A field flattener, which corrects for field curvature to ensure your images have sharp, pinpoint stars from the center to the corners of the frame—an essential component often sold separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics Zenithstar 61II ready for astrophotography out of the box?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e The Zenithstar 61II is packaged as a complete imaging solution. It includes the essential \u003cstrong\u003eFlat61A field flattener\u003c\/strong\u003e to ensure sharp stars across your sensor, a precise \u003cstrong\u003e2-inch dual-speed focuser\u003c\/strong\u003e for accurate adjustments, and an integrated \u003cstrong\u003eBahtinov mask\u003c\/strong\u003e in the lens cap for achieving critical focus easily.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the FPL-53 glass in the Zenithstar 61II benefit imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Ohara \u003cstrong\u003eFPL-53 ED glass\u003c\/strong\u003e element provides apochromatic (APO) color correction. This minimizes chromatic aberration, or false color, which can appear as purple halos around bright stars. For imagers, this means sharper stars, higher contrast, and more accurate color data directly from the camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Zenithstar 61II a good portable or travel telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Z61II is designed for portability. Its compact size, lightweight CNC-machined aluminum body, and included padded soft carrying case make it easy to transport. It's an ideal \"grab-and-go\" scope for taking to dark sky sites or on trips.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Zenithstar 61II frame a large target like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Zenithstar 61II's wide field of view is perfectly suited for large deep-sky objects. When paired with a camera using an APS-C or smaller sensor, it can easily capture the entirety of massive targets like the North American Nebula (NGC 7000) or the Andromeda Galaxy (M31) in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Zenithstar 61II for visual observing on a small tracking mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While optimized for imaging, the Z61II is also an excellent visual instrument. Its light weight and Vixen dovetail make it a perfect match for portable tracking mounts like the Sky-Watcher Star Adventurer. With a 2-inch diagonal and a low-power, wide-field eyepiece, it provides stunning, expansive views of the Milky Way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the saddle handle bar on the Zenithstar 61II?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe handle bar serves two functions. It provides a secure and balanced grip for carrying the telescope and placing it on a mount. It also features a Vixen-style saddle, allowing you to mount accessories like a small guide scope or a red dot finder directly on top of the optical tube.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003eGrey, Gold\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eZenithstar 61 II APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFlat61A Field Flattener\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Rings with Saddle Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVixen-Style Dovetail Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLens Cap with Integrated Bahtinov Mask\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Grey","offer_id":44967230898461,"sku":"WO-A-Z61IITG","price":962.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":51501958594845,"sku":"WO-A-Z61IIGD","price":962.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/WO-Z-61-II-Grey-1.jpg?v=1722104068"},{"product_id":"apm-140mm-f-7-fpl-53-doublet-apo-lens-in-cell","title":"APM 140mm F\/7 FPL 53 Doublet APO - Lens in Cell","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet SD Apo 140 f\/7 FPL53 and Lanthanium H-LAF53 Lens in Cell\u003cbr\u003e\u003cbr\u003e\u003c\/b\u003eThe new APM 140mm Doublet is a mold breaker with high quality. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 140mm SD-Apo features a Doublet lens cell using SD glass FPL-53 to maximize performance. . As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003eWith 980mm focal length, the 140mm SD-Apo is an impressive all-rounder. \u003cbr\u003e\u003cbr\u003eWith the new 140mm SD optic we believe we have created an Apo of incomparable performance and value in its category.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003cbr\u003e\u003c\/b\u003e\u003cul\u003e\u003cli\u003e140 mm f\/7 Lens in Cell\u003c\/li\u003e\u003c\/ul\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL-53 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e140 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e980 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eMulticoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.83\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.5 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e280 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eca. 4.4 lb\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665762589,"sku":"APM140-7Lens","price":2850.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-140mm-F-7-FPL-53-Doublet-APO-Lens-in-Cell-1__65430.1600124047.1280.1280.jpg?v=1684345494"},{"product_id":"apm-140mm-f-7-fpl-53-doublet-apo-refractor-2-5-focuser","title":"APM 140mm F\/7 FPL 53 Doublet APO Refractor - 2.5\" Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet SD Apo 140 f\/7 FPL53 \u0026amp; Lanthanium H-LAF53 Optical Tube\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003eThe new APM 140mm f\/980mm Doublet is a mold breaker with high quality. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 140- SD Apo features a Doublet lens cell using SD glass FPL-53 to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cu\u003e\u003cb\u003e\u003cspan\u003eThe special feature of the 140mm SD APO:\u003c\/span\u003e\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003c\/span\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery high quality processed and of convincingly good optical quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cspan\u003eColorless optics with FLP53 glass and \u003c\/span\u003e\u003c\/span\u003e\u003cspan\u003e\u003cspan\u003eLanthan H-LAF53 \u003c\/span\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003ePrecise 2.5\" focuser with 1:10 mirco reduction for heavy accessories\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eWith f \/ 7 ideal for visual and photographic purposes\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCNC tube rings\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCarry handle\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery good value for money\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\u003cspan\u003eWith 980mm focal length, the 140-SD Apo is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eTraditional APM quality has been applied in all areas. The new 2.5\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs.\u003cspan\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cspan\u003eAs optional photo accessory for the SD APO 140 f \/ 7, we recommend our Riccardi Flattener APO Reducer 0.75xM82 (the focal length is reduced to 735mm at f \/ 5.25) or our Riccardi APO Flattener Model 2 for APO's. (please look recommended products)\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eWith the new 140 mm SD Apo we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings with handle\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2.5\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLosmandy-Style Dovetail\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/apm-140mm-doublet-apo-refractor-r3161\"\u003eReview (Cloudy Nights)\u003c\/a\u003e\u003c\/div\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL-53 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e140 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e980 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eMulticoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.83\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.5 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e280 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2.5\" APM Focuser, 360° rotatable, with 1:10 Micro Focusing\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e157 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1030 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e830 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength of dewcap:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e290 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e9,0 kg ( with Tuberings, handle, 3\" dovetail )\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665795357,"sku":"APM140-7-2.5ZTA","price":4977.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-140mm-F-7-FPL-53-Doublet-APO-Refractor-2-5-inch-Focuser-1__82048.1600124047.1280.1280.jpg?v=1684345498"},{"product_id":"apm-140mm-f-7-fpl-53-doublet-apo-refractor-3-7-zta-focuser","title":"APM 140mm F\/7 FPL 53 Doublet APO Refractor - 3.7\" ZTA Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet SD Apo 140 f\/7 FPL53 Optical Tube\u003cbr\u003e\u003c\/b\u003e\u003cbr\u003eThe new APM 140mm f\/980mm Doublet is a mold breaker with high quality. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 140- SD Apo features a Doublet lens cell using SD glass FPL-53 to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cu\u003e\u003cb\u003e\u003cspan\u003eThe special feature of the 140mm SD APO:\u003c\/span\u003e\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003c\/span\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery high quality processed and of convincingly good optical quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eColorless optics with FLP53 glass\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003ePrecise 3.7 \"focuser with 1:10 mirco reduction for heavy accessories\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eWith f \/ 7 ideal for visual and photographic purposes\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCNC tube rings\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCarry handle\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery good value for money\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003eWith 980mm focal length, the 140-SD Apo is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003cbr\u003e\u003cbr\u003eTraditional APM quality has been applied in all areas. The new 3.7\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs. \u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cspan\u003eAs optional photo accessory for the SD APO 140 f \/ 7, we recommend our Riccardi Flattener APO Reducer 0.75xM82 (the focal length is reduced to 735mm at f \/ 5.25) or our Riccardi APO Flattener Model 2 for APO's. (please look recommended products)\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003eWith the new 140 mm SD Apo we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings with handle\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e3.7\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLosmandy-Style Dovetail\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/apm-140mm-doublet-apo-refractor-r3161\"\u003eReview (Cloudy Nights)\u003c\/a\u003e\u003c\/div\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL-53 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e140 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e980 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eMulticoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.83\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.5 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e280 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e3.7\" R\u0026amp;P Focuser, Rotation 360°\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e152 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1030 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e830 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength of dewcap:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e290 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e9.8Kg (with tuberings)\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665828125,"sku":"APM140-7-3.7ZTA","price":5391.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/APM-140mm-F-7-FPL-53-Doublet-APO-Refractor-3-7-inch-ZTA-Focuser-1__50236.1600124048.1280.1280.jpg?v=1684345500"},{"product_id":"apm-152mm-f-8-fpl-51-doublet-apo-lens-in-cell","title":"APM 152mm F\/8 FPL 51 Doublet APO Lens in Cell","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet ED Apo 152 f\/7.9 Optic\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003eThe new APM 152-1200 Doublet is a mold breaker in the 6\" Refractor category. We have painstakingly engineered an optical solution to bring you APM quality at an unheard price. The new 152-1200ED features a Doublet lens cell using ED glass equivalent to FPL-51 complimented by a Lanthanum coated element to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a lens of this price. As with all APM optics consistency is assured and each lens goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003eWith a generous 1200mm focal length, the 152-1200ED is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new optic will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\u003cli\u003eLens 152 mm f\/7.9 Doublet\u003cbr\u003e\n\u003c\/li\u003e\u003c\/ul\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL51 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e152 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7.9\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1200 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eBroadband Mulitcoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.76\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.7 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e300 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665893661,"sku":"APM-152-1200-FPL51\/La-D","price":2902.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-152mm-F-8-FPL-51-Doublet-APO-Lens-in-Cell-1__25485.1600124048.1280.1280.jpg?v=1684345525"},{"product_id":"apm-152mm-f-8-fpl-51-doublet-apo-refractor-2-5-focuser","title":"APM 152mm F\/8 FPL 51 Doublet APO Refractor - 2.5\" Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Doublet ED Apo 152 f\/7.9 Optical Tube with Accessories\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eThe  APM 152-1200 Doublet is a mold breaker in the 6\" Refractor category. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 152-1200ED features a Doublet lens cell using ED glass of FPL-51 complimented by a Lanthanum  element to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003eWith a generous 1200mm focal length, the 152-1200ED is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003cbr\u003e\u003cbr\u003eThe new 152-1200ED is also supplied with extensive accessories. Inside the quality Aluminium transport case you will find not only a fantastic value telescope but also a newly designed 2.5\" focuser, CNC tube rings incorporating a carrying handle, 330mm Losmandy style dovetail and finder bracket.\u003cbr\u003e\u003cbr\u003eTraditional APM quality has been applied in all areas. The new 2.5\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs. Of course, if you would like to use a Starlight Instruments Feather Touch (model FTF3035B-A) then this can be supplied as an option, for that reason the tube end has an thread M109 x 1 and M95 x 1 to accept a 3\" or 2.5\" Starlight focuser.\u003cbr\u003e\u003cbr\u003eImaging accessories for the 152-1200 include a 2.5\" (Order Nr. TSFlat2,5) field flattener which maintains focal length. There is also a dedicated Massimo Riccardi designed APM Reducer (Order Nr.  APM-RIRED152-1200S-2L or APM-RIRED152-1200-2L). This changes the focal length by a factor of x0.75, resulting in a 900mm focal length and fast f5.9 aperture.\u003cbr\u003e\u003cbr\u003eWith the new 152-1200ED we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2,5\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2\"\/1,25\" del. adapter\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCarrying Case\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/review-of-the-apm-152-ed-serial-number-245-r3175\"\u003eReview (Cloudy Night)\u003c\/a\u003e\u003c\/div\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL51 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e152 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7.9\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1200 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eBroadband Mulitcoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.76\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.7 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e300 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e2.5\" Rack and Pinion Focuser with 1:10 Micro Focusing\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eM68, 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e156 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1220 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1020 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e23.6 lb incl. Tuberings and 3\" Dovetail, 18.6 lb Tube only without Caps\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eyes\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e26.4 lb\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e55,66\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eEyepiece adapter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eto 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967665926429,"sku":"APM-152-1200-FPL51\/La-D-2.5ZTA","price":4977.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/APM-152mm-F-8-FPL-51-Doublet-APO-Refractor-2-5-inch-Focuser-1__31812.1600124049.1280.1280.jpg?v=1684345527"},{"product_id":"apm-152mm-f-8-fpl-51-doublet-apo-refractor-3-7-zta-focuser","title":"APM 152mm F\/8 FPL 51 Doublet APO Refractor - 3.7\" ZTA Focuser","description":"\u003c!-- more --\u003e\u003cb\u003eAPM Refractor Telescope Doublet ED Apo 152 f\/7.9 OTA with 3.7\" focuser\u003c\/b\u003e\u003cbr\u003e\u003cbr\u003eThe new APM 152-1200 Doublet is a mold breaker in the 6\" Refractor category. We have painstakingly engineered an optical and tube solution to bring you APM quality at an unheard price. The new 152-1200ED features a Doublet lens cell using ED glass equivalent to FPL-51 complimented by a Lanthanum  element to maximize performance. Our innovative combination of materials and design has resulted in optical performance far beyond the normal for a telescope of this price. As with all APM telescopes consistency is assured and each telescope goes through an interferometrical test at the 532nm (green) wavelength before shipping.\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cu\u003e\u003cb\u003e\u003cspan\u003eThe special feature of the 152 mm ED APO:\u003c\/span\u003e\u003c\/b\u003e\u003c\/u\u003e\u003cbr\u003e\u003c\/span\u003e\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery high quality processed and of convincingly good optical quality\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eColorless optics with FLP51 glass\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003ePrecise 3.7 \"focuser with 1:10 mirco reduction for heavy accessories\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eWith f \/ 7 ideal for visual and photographic purposes\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCNC tube rings\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eCarry handle\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cspan\u003eVery good value for money\u003c\/span\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003eWith a generous 1200mm focal length, the 152-1200 ED is an impressive all-rounder. From intricate double star observing to high contrast detailed planetary views, this new scope will introduce a whole new group of Astronomy enthusiasts to APM quality.\u003cbr\u003e\u003cbr\u003eThe new 152-1200ED is also supplied with extensive accessories. Inside the quality Aluminium transport case you will find not only a fantastic value telescope but also a newly designed 3,7\" focuser, CNC tube rings incorporating a carrying handle, 330mm Losmandy style dovetail and finder bracket.\u003cbr\u003e\u003cbr\u003eTraditional APM quality has been applied in all areas. The new 3,7\" focuser is a Rack and Pinion type, with 1:10 focusing. It remains rigid under high loads making it suitable for imaging. The attention to detail extends to areas like the 2\" and 1.25\" eyepiece adapters. These use a new design of collar clamp, far superior to the common brass compression rings found on lesser designs. Also new is our 2\" APM  Fast Lock adapter now .\u003cbr\u003e\u003cbr\u003e\u003cspan\u003e\u003cspan\u003eAs optional photo accessory for the ED Apo 152 f\/1200 , we recommend our Riccardi Flattener APO Reducer 0.75xM82 (the focal length is reduced to 900mm at f \/ 5.9) or our Riccardi APO Flattener Model 2 for APO's. (please look recommended products)\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003eWith the new 152-1200ED we believe we have created an Apochromatic Refractor of incomparable performance and value in its category.\u003cbr\u003e\u003cbr\u003e\u003cb\u003eDelivery contains:\u003c\/b\u003e\u003cbr\u003e\u003cul\u003e\n\u003cli\u003eOptical Tube\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1 Pair of Tuberings\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e3,7\" Focuser with 1:10 Microfocusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2\"\/1,25\" del. adapter\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShoe for Finderbracket\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCarrying Case\u003c\/li\u003e\n\u003cli\u003eAdapter M82 x 1 ID ( Backfokus 230 mm )\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdapter M82 x 1 OD to M68 x 1 ID\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdapter M68 x 1 OD to M63 x 1 ID\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdapter M63 x 1 OD to 2\" APM Fast Lock  ( backfocus 180 mm )\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv\u003e\u003ca href=\"https:\/\/www.cloudynights.com\/articles\/cat\/user-reviews\/review-of-the-apm-152-ed-serial-number-245-r3175\"\u003eReview (Cloudy Night)\u003c\/a\u003e\u003c\/div\u003e\u003ci\u003e\u003c\/i\u003e\u003cbr\u003e\u003cbr\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eType of telescope:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED-Apochromat\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLens:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eDoublet ED Apo with FPL51 Element\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eColor:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eblack \/ white\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube material:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eAluminium\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eAperture:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e152 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal ratio:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003ef\/7.9\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocal length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1200 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCoating:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eBroadband Mulitcoated\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eResolution:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e0.76\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLimit value:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e12.7 mag\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eMax. useful visual power:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e300 x\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eBackfokus:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e180 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eFocuser:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e3.7\" R\u0026amp;P Focuser, Rotation 360°\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eConnection to eyepiece:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eM68, 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eViewfinder:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003enone supplied\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e156 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eLength during observing:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1220 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTransportation length:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e1020 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eDewcap diameter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e186 mm\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eyes\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eCase weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e26.4 lb\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTotal weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e55,66\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eEyepiece adapter:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003eto 2\" and 1.25\"\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cb\u003eTube weight:\u003c\/b\u003e\u003c\/div\u003e\n\u003cdiv\u003e25.6 lb incl. Tuberings and 3\" Dovetail, 20.6 lb Tube only without Caps\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"APM","offers":[{"title":"Default Title","offer_id":44967666155805,"sku":"APM-152-1200-FPL51\/La-D-3.7ZTA","price":5184.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/APM-152mm-F-8-FPL-51-Doublet-APO-Refractor-3-7-inch-ZTA-Focuser-1__58999.1600124049.1280.1280.jpg?v=1684345549"},{"product_id":"sharpstar-94edph-f-5-5-triplet-apo","title":"SharpStar 94EDPH f\/5.5 Triplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eAperture: 94mm\u003c\/li\u003e\n\u003cli\u003eFocal Ratio: f\/5.5\u003c\/li\u003e\n\u003cli\u003eFocal Length: 517mm\u003c\/li\u003e\n\u003cli\u003eOptical Design: Triplet APO with Two ED Elements\u003c\/li\u003e\n\u003cli\u003eWeight: 3.3KG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 94EDPH f\/5.5 Triplet APO\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 94EDPH f\/5.5 Triplet APO combines a 94mm aperture with a 517mm focal length in a lightweight 3.3KG optical tube assembly. Its air-spaced triplet objective, featuring two ED glass elements, achieves a theoretical resolution of 1.28 arc-seconds down to a limiting magnitude of 11.62, delivering high-contrast, color-pure images for discerning astrophotographers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e94mm f\/5.5 Triplet APO: Dual ED Glass for Aberration-Free Images\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 94EDPH is an air-spaced triplet objective incorporating two pieces of extra-low dispersion (ED) glass. This design aggressively corrects chromatic aberration, eliminating the color fringing around bright stars that can soften images from lesser optics. The result is a sharp, high-contrast view with pinpoint stars across the field.\u003c\/p\u003e\n\u003cp\u003eThe native f\/5.5 focal ratio is fast enough for efficient deep-sky imaging, reducing required exposure times to capture faint details. This optical system is engineered to produce images where the only limit is the seeing conditions, resolving fine structures down to 1.28 arc-seconds.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eField-Ready at 3.3KG: A Compact Grab-and-Go Astrograph\u003c\/h3\u003e\n\u003cp\u003eWeighing only 3.3KG and measuring just 468mm in length, the SharpStar 94EDPH is built for portability. Its low weight and compact size allow it to be carried securely by a wide range of mid-sized equatorial mounts, reducing the need for a heavy, observatory-class setup. This makes it an ideal choice for traveling to dark-sky sites.\u003c\/p\u003e\n\u003cp\u003eThe telescope includes a robust set of mounting hardware right out of the box. A pair of CNC-machined tube rings, a Vixen-style dovetail plate, and a sturdy carrying handle ensure the optical tube is secure and easy to manage, both on and off the mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e517mm Focal Length: Framing Nebulae and Galaxies at f\/5.5\u003c\/h3\u003e\n\u003cp\u003eThe 517mm focal length provides a versatile field of view that is perfectly suited for many of the most popular deep-sky targets. With a modern APS-C or Micro Four Thirds sensor, you can easily frame large objects like the Andromeda Galaxy (M31) or the entire North American Nebula (NGC 7000) in a single shot.\u003c\/p\u003e\n\u003cp\u003eFor imagers seeking an even wider and faster system, an optional dedicated reducer brings the focal ratio down to f\/4.4. This accessory transforms the 94EDPH into an exceptionally fast astrograph capable of illuminating full-frame sensors, making it possible to capture vast nebulae complexes and star fields with significantly shorter exposure times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSharpStar 94EDPH vs. 80mm APOs: The Impact of 94mm Aperture\u003c\/h3\u003e\n\u003cp\u003eWhile 80mm refractors are a popular starting point, the 94mm aperture of the 94EDPH offers a significant step up in light-gathering power and resolution. This directly translates to brighter images, shorter sub-exposure times, and the ability to resolve finer details in galactic dust lanes and planetary nebulae.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigher Resolution:\u003c\/strong\u003e The 94EDPH resolves down to 1.28 arc-seconds, a noticeable improvement over the ~1.45 arc-second limit of a typical 80mm refractor, revealing more intricate structures in your targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreater Light Grasp:\u003c\/strong\u003e The larger 94mm objective collects substantially more photons per second than an 80mm lens. This allows you to capture faint, extended objects with better signal-to-noise ratio in the same amount of imaging time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintained Portability:\u003c\/strong\u003e Despite its larger aperture, the 94EDPH remains highly portable at just 3.3KG, occupying a similar weight class to many fully-equipped 80mm imaging setups.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of objects is the SharpStar 94EDPH best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SharpStar 94EDPH excels at imaging medium to large deep-sky objects. Its \u003cstrong\u003e517mm focal length\u003c\/strong\u003e provides an ideal field of view for targets like the Andromeda Galaxy (M31), the Orion Nebula (M42), the North American Nebula (NGC 7000), and large open star clusters like the Pleiades (M45).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need the optional reducer for the SharpStar 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe optional reducer is recommended if you plan to use a \u003cstrong\u003efull-frame camera\u003c\/strong\u003e or want to capture very large targets in a single frame. It also speeds up the optical system to f\/4.4, reducing exposure times. For cameras with APS-C or smaller sensors, the native \u003cstrong\u003ef\/5.5 focal ratio\u003c\/strong\u003e and 517mm focal length are excellent for a wide range of nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size mount do I need for the SharpStar 94EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a bare optical tube weight of only \u003cstrong\u003e3.3KG\u003c\/strong\u003e, the 94EDPH is not demanding. For astrophotography, a mid-sized equatorial mount with a payload capacity of around 30 lbs (13.6 kg), such as a Sky-Watcher HEQ5 or iOptron CEM26, is a perfect match and will provide stable, accurate tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 94EDPH good for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The triplet apochromatic objective with two ED elements delivers sharp, high-contrast, and color-free views. It performs beautifully as a rich-field telescope for sweeping the Milky Way, observing open clusters, and viewing larger nebulae with appropriate filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SharpStar 94EDPH frame the Andromeda Galaxy (M31) with an APS-C sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 517mm focal length is an excellent match for framing the Andromeda Galaxy on a typical APS-C sensor. You will be able to capture the bright galactic core, its extensive dust lanes, and its two main satellite galaxies, M32 and M110, all within a single, well-composed frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SharpStar 94EDPH for high-resolution planetary imaging on Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the 94EDPH is primarily a wide-field instrument, it can be used for planetary viewing and imaging. Its \u003cstrong\u003e1.28 arc-second resolution\u003c\/strong\u003e is capable of revealing details like cloud bands on Jupiter and the Cassini Division in Saturn's rings. For imaging, you will need to add a high-quality 3x or 5x Barlow lens to increase the image scale sufficiently for a planetary camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e94mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e517mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens Design\u003c\/td\u003e\n\u003ctd\u003eTriplet air-spaced APO (two ED glass elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e1.28 arc-seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e11.62\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Length\u003c\/td\u003e\n\u003ctd\u003e468mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Diameter\u003c\/td\u003e\n\u003ctd\u003e118mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e3.3KG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967741128989,"sku":"SSO-94EDPH","price":2303.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-94EDPH-1__34426.1650566400.1280.1280.jpg?v=1684345758"},{"product_id":"sharpstar-100qii-f-5-8-quadruplet-apo","title":"SharpStar 100QII f\/5.8 Quadruplet APO","description":"\u003c!-- more --\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cspan\u003eCompare with the first generation products, it has the following features:\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e1 The optical design has changed, in addition to the original F5.8 focal ratio, F4.3 full-frame reducer lens can be used.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e2. The appearance becomes more stylish and streamlined.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e3. Change of focuser: use 3.2-inch focuser, plus a 360-degree rear CAA, and the angle adjuster.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e4. Add a nice-looking and practical handle.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003ePRODUCT DETAILS：\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eFeatures of SharpStar 100Q ED APO refractor: \u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•100MM f\/5.8 quartette doublet air-spaced optical design\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•Includes one special ED lens\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•Brand-new 3.2\" dual-speed rack and pinion focuser, 10:1 fine focus\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•2\" and 1.25\" universal interfaces, M82 thread interface, M82 screw M48 photographic taper interface (sold separate)\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•Angle adjuster for 360 degree rotation\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•Universal (Vixen-style) dovetail bar with tube rings\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•Push-fit drawtube Dew-shield is provided with slidelock\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e•Add finderscope mounting devotail interface\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eSHARPSTAR 100QII ED APO apochromatic refractor tube features a quartette doublet air-space design that includes one special ED lens and the full-surface multi-coated is adopted. The quartette optical design makes SHARPSTAR 100QII an excellent imaging and observing performance. The image circle of not less than 44mm makes the 100QII a good match to any full-frame camera, giving you unparalleled shooting quality. The use of special ED glass offers excellent chromatic aberration control, not only reflected in high quality imaging, but takes observation with the 100QII into a new realm. No matter its sharpness, contrast, or chromatic aberration control, it has quite excellent performance.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eSHARPSTAR 100QI ED APO provides a wonderful observing and astrophotography system thanks to the proper focal ratio. The unique quartette design incorporates special ED APO lens for excellent chromatic aberration control, sharp stars and overall sharper images.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eSHARPSTAR 100QII ED APO also offers an impressive focusing system while providing an excellent optical system. SHARPSTAR 100QII ED APO has a two-speed 3-inch rack and pinion focuser with 1:10 focusing ratio. Compared with many refractors on the market, the use of a rack and pinion focuser offers larger payload and a stronger hold, so that your focuser will not slip when using heavy-duty observation accessories or camera. Worried about being out of focus or badly framed image? The 360-degree rotator allows you to easily rotate the shooting angle and correct the framing to your own satisfaction. More importantly, its 3-inch focusing tube is more robust and more stable than most commercially available 3-inch focusing tubes. It also provides good upgrades for heavy-duty accessories such as large-caliber field flatteners.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eIn addition, the newly improved load-bearing adjustment screw on the body of the focuser lets you to adjust your focuser according to the weight of the attachment.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_100QII_Backfocus.jpg?v=1684345733\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_100QII_Dimensions.jpg?v=1684345735\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_100QII_Spot.jpg?v=1684345736\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_94EDPH_Dimensions.jpg?v=1684345729\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_94EDPH_Spot.jpg?v=1684345731\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\u003cp\u003eAperture: 100mm\u003cbr\u003eFocal Length: 580mm\u003cbr\u003eLimiting star magnitude: 11.8\u003cbr\u003eFocal ratio: F5.8\u003cbr\u003eResolution：1.16 arc seconds\u003cbr\u003eTube length: 508mm (dew-shield indended), 600mm (dew-shield extended)\u003cbr\u003eAccessories: A piece of tube ring, a dovetail plate, a handle\u003cbr\u003eMain tube outer diameter: 114mm\u003cbr\u003eOTA Weight: 4.3k\u003cbr\u003eTotal Weight (with rings, dovetail plate and handle): 5.2kg\u003cbr\u003eObjective type: Quadruplet air-spaced APO\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967741292829,"sku":"SSO-100QII","price":3339.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-100QII-1__41727.1609003092.1280.1280.jpg?v=1684345753"},{"product_id":"sharpstar-121sdq-f-5-6-quintuplet-apo","title":"SharpStar 121SDQ f\/5.6 Quintuplet APO","description":"\u003c!-- more --\u003e\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cspan\u003eThis product is a new generation of independent design of quintuple air-spaced high quality refractor telescope which take the form of dual after triplet. One of the triplet lens is ultra-low dispersion ED glass, which fully optimizes the function of photography, the range of image can reach the 60mm influence circle of medium frame, and the image peripheral dimming control is excellent. For most amateur astronomer it will be the device of choice for astrophotography.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eConsidering the importance of photographic focal plane, this product leaves 145mm space for the connection of professional high performance imaging equipment and accessories.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThe 4-inch large focuser is belong to domestic initiation, the abundant threaded interface makes it easy for various joints and accessories\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThis product is a beautiful, fashion style professional design and manufacturing to bring good product experience.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_121SDQ_Dimensions.jpg?v=1684345739\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/t\/7\/assets\/description_image_SharpStar_121SDQ_Spots.jpg?v=1684345741\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003cdiv data-custom-tab\u003e\n\u003cp data-custom-tab-title\u003eSpecifications\u003c\/p\u003e\n\u003cdiv\u003e\u003cp\u003eAperture: 121mm\u003cbr\u003eFocal Length: 678mm\u003cbr\u003eLimiting star magnitude: 12.1\u003cbr\u003eFocal ratio: F5.6\u003cbr\u003eResolution：0.97 arc seconds\u003cbr\u003eTube length: 598mm (dew-shield indended), 698mm (dew-shield extended)\u003cbr\u003eAccessories: A piece of tube ring, a dovetail plate, a handle\u003cbr\u003eMain tube outer diameter: 130mm\u003cbr\u003eNet Weight: 7.98kg\u003cbr\u003eObjective type: Quintuplet air-spaced APO\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967742210333,"sku":"SSO-121SDQ","price":5319.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-121SDQ-1__19472.1609006233.1280.1280.jpg?v=1684345756"},{"product_id":"sharpstar-140ph-f-6-5-triplet-apo","title":"SharpStar 140PH f\/6.5 Triplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e140mm Aperture\u003c\/li\u003e\n\u003cli\u003e910mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/6.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eTriplet Air-Spaced APO Objective with Two ED Elements\u003c\/li\u003e\n\u003cli\u003e0.83 arc-seconds Resolution\u003c\/li\u003e\n\u003cli\u003e10.1kg Net Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 140PH f\/6.5 Triplet APO\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 140PH delivers exceptional apochromatic imaging with a 140mm aperture and a 910mm focal length. Its f\/6.5 triplet objective incorporates two ED glass elements to achieve a theoretical resolution of 0.83 arc-seconds with virtually zero chromatic aberration. The optical tube assembly (OTA) has a net weight of 10.1kg and measures a transportable 738.6mm with its dew shield retracted, reaching down to a limiting magnitude of 11.5 for both visual and photographic pursuits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e140mm Triplet APO Optics with Dual ED Glass\u003c\/h3\u003e\n\u003cp\u003eAt the core of the 140PH is an air-spaced triplet objective featuring two pieces of extra-low dispersion (ED) glass. This dual-ED design provides a level of color correction superior to standard doublet or single-ED triplet systems, ensuring stars are sharp, high-contrast points of light without distracting purple fringing. This allows the 140mm objective to perform at its theoretical limit, resolving details down to 0.83 arc-seconds under ideal conditions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced Aberration Control:\u003c\/strong\u003e The use of two ED elements significantly suppresses chromatic aberration, delivering true-to-life star colors and enhancing contrast on subtle planetary and deep-sky details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Contrast Views:\u003c\/strong\u003e By focusing all wavelengths of light to a single point, the image is sharper and the sky background appears darker, making faint structures in nebulae and galaxies easier to discern.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e10.1kg OTA with a 738.6mm Retracted Length\u003c\/h3\u003e\n\u003cp\u003eEngineered for stability and field use, the SharpStar 140PH features a robust mechanical build with a net weight of 10.1kg. The main tube has an outer diameter of 148mm and retracts to a length of just 738.6mm, making it manageable for transport and setup. The gross weight, including the supplied tube rings, dovetail plate, and handle, is 11.7kg, requiring a medium-class equatorial mount for stable imaging.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable Dew Shield:\u003c\/strong\u003e Helps prevent moisture from forming on the objective lens during long nights and blocks stray light from entering the optical path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Mounting Hardware:\u003c\/strong\u003e Comes ready to mount with a matched pair of tube rings, a universal Vixen\/Losmandy-style dovetail plate, and a rigid carrying handle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame Astrograph at f\/6.5\u003c\/h3\u003e\n\u003cp\u003eThe 140PH is designed as a premium astrograph with its native f\/6.5 focal ratio providing an excellent balance between image scale and brightness. The 910mm focal length is ideal for framing medium-to-large deep-sky objects like the Andromeda Galaxy (M31) or the Orion Nebula (M42) on full-frame sensors. For imagers seeking a wider field or faster acquisition, an optional 0.73x reducer transforms the scope into a fast f\/4.8 system, significantly cutting down exposure times.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisual and Photographic Versatility:\u003c\/strong\u003e While optimized for imaging, the superb optics also make the 140PH a powerful visual instrument, capable of reaching a limiting magnitude of 11.5.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional Speed Reduction:\u003c\/strong\u003e The availability of a dedicated reducer adds flexibility, allowing you to adapt the telescope's focal ratio to your specific target and imaging conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the SharpStar 140PH's dual ED glass objective special?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe triplet objective in the SharpStar 140PH uses \u003cstrong\u003etwo ED (Extra-low Dispersion) glass elements\u003c\/strong\u003e instead of the more common single element. This provides a higher degree of color correction, virtually eliminating chromatic aberration (false color fringing) for sharper stars, higher contrast, and more accurate color rendition in astrophotos.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 140PH portable for field use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile not a lightweight \"grab-and-go\" scope, the 140PH is designed to be transportable. Its \u003cstrong\u003enet weight is 10.1kg\u003c\/strong\u003e and it has a retracted length of \u003cstrong\u003e738.6mm\u003c\/strong\u003e, allowing it to fit in most vehicles. It requires a stable equatorial mount capable of handling the 11.7kg gross weight with accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the SharpStar 140PH perform on planetary targets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SharpStar 140PH excels at high-resolution planetary viewing and imaging. Its \u003cstrong\u003e140mm aperture\u003c\/strong\u003e and apochromatic optics deliver high-contrast, color-pure images, allowing you to resolve fine details like the cloud bands of Jupiter and the Cassini Division in Saturn's rings, approaching its theoretical \u003cstrong\u003e0.83 arc-second resolution\u003c\/strong\u003e limit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is needed for the SharpStar 140PH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor stable astrophotography, you will need a robust equatorial mount with a payload capacity of at least 15-20kg (33-44 lbs). This ensures the mount can comfortably handle the \u003cstrong\u003e11.7kg gross weight\u003c\/strong\u003e of the telescope plus any additional cameras, guide scopes, and other accessories without compromising tracking accuracy.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the SharpStar 140PH be used for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While designed as an astrograph, its premium optics provide stunning visual views. With a \u003cstrong\u003elimiting magnitude of 11.5\u003c\/strong\u003e, it can reveal faint deep-sky objects, and its high-contrast, color-free performance makes it an excellent instrument for observing the Moon, planets, and bright double stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of using the optional reducer with the SharpStar 140PH for imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Andromeda Galaxy is a large target. At the native \u003cstrong\u003ef\/6.5\u003c\/strong\u003e focal ratio, you get a detailed view of its core. By adding the optional 0.73x reducer, you change the focal ratio to a much faster f\/4.8. This provides two benefits: it widens the field of view to better frame the entire galaxy and its spiral arms, and it reduces required exposure times by more than 40%.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture Size\u003c\/td\u003e\n\u003ctd\u003e140mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e910mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eTriplet air-spaced APO (including two ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.83 arc-seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Magnitude\u003c\/td\u003e\n\u003ctd\u003e11.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Tube Length (Retracted)\u003c\/td\u003e\n\u003ctd\u003e738.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain Tube Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e148mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e10.1kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e11.7kg (Including tube ring, dovetail plate and handle)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eA Pair of specialized tube ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eA universal dovetail\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eA handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SharpStar_140PH_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44967742406941,"sku":"SSO-140PH","price":6159.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-140PH-1__93181.1609007115.1280.1280.jpg?v=1684345761"},{"product_id":"askar-fra400-72mm-f-5-6-quintuplet-apo","title":"Askar FRA400 72mm f\/5.6 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e72mm Aperture Quintuplet APO Lens\u003c\/li\u003e\n\u003cli\u003e400mm Focal Length at f\/5.6\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003e140mm Available Back Focus\u003c\/li\u003e\n\u003cli\u003e3\" Rack-and-Pinion Focuser with 360° Rotator\u003c\/li\u003e\n\u003cli\u003e2.88kg Total Weight with Rings and Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA400 72mm f\/5.6 Quintuplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar FRA400 is a portable imaging instrument designed around a 72mm f\/5.6 quintuplet objective that delivers a natively flat 44mm image circle without requiring an external flattener. Its 400mm focal length provides an ideal image scale for large nebulae and star fields, while the entire optical tube assembly weighs just 2.56kg. With a generous 140mm of back focus and a total weight of 2.88kg including its mounting hardware, this Flat-field Refractive Astrograph (FRA) is engineered for full-frame imaging from the moment you take it out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuintuplet Optics: A 44mm Flat Field with Zero Hassle\u003c\/h3\u003e\n\u003cp\u003eThe core of the FRA400 is its 5-element Petzval-like optical design, which incorporates two ED glass elements to achieve apochromatic color correction. This design corrects for field curvature internally, eliminating the need to purchase and correctly space a separate field flattener. The result is a 44mm image circle, fully illuminating full-frame sensors with sharp, pinpoint stars from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging Mechanics: 3\" Focuser and 360° Rotator\u003c\/h3\u003e\n\u003cp\u003eBuilt for modern astrophotography, the FRA400 features a robust 3-inch rack-and-pinion focuser that can handle heavy imaging trains without flexure or slippage. A 360-degree rotator allows for precise framing of your target without disturbing focus, while a fine-focus knob enables critical adjustments. The entire assembly, measuring just 317mm with its dew shield retracted, is built for stability and portability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e140mm Back Focus: Room for Any Imaging Train\u003c\/h3\u003e\n\u003cp\u003eOne of the FRA400's most significant advantages is its 140mm of available back focus, measured from the M68x1 male thread on the rotator. This extensive travel provides ample room to accommodate complex imaging setups, including filter wheels, off-axis guiders, and rotators. Askar includes a conical M68-M48 adapter, as well as 2-inch and 1.25-inch adapters, ensuring compatibility with virtually any camera or accessory right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"FRA\" mean for the Askar FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eFRA\u003c\/strong\u003e stands for \u003cstrong\u003eF\u003c\/strong\u003elat-field \u003cstrong\u003eR\u003c\/strong\u003eefractive \u003cstrong\u003eA\u003c\/strong\u003estrograph. This means the Askar FRA400 is designed with a built-in optical element that corrects for field curvature, so you do not need a separate field flattener. It produces a flat, sharp image across its entire 44mm image circle natively.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to buy a separate field flattener for the Askar FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The quintuplet (5-element) objective lens design provides a corrected 44mm image circle without any additional accessories. You can attach your full-frame or smaller camera directly and achieve sharp stars across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar FRA400's 44mm image circle work with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard full-frame sensor has a diagonal of approximately 43.3mm. The Askar FRA400's specified \u003cstrong\u003e44mm image circle\u003c\/strong\u003e fully illuminates these sensors, preventing vignetting (darkening of the corners) and ensuring your entire frame is usable for imaging large targets like the Andromeda Galaxy (M31) or the Veil Nebula complex.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar FRA400 suitable for a portable \"grab-and-go\" setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. With an optical tube weight of \u003cstrong\u003e2.56kg\u003c\/strong\u003e and a total weight of \u003cstrong\u003e2.88kg\u003c\/strong\u003e with rings and dovetail, the Askar FRA400 is extremely lightweight. Its compact 317mm length makes it easy to transport and mount on lighter-duty equatorial mounts, making it an excellent choice for field imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the 140mm back focus on the Askar FRA400?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e140mm back focus\u003c\/strong\u003e provides extensive space for accessories. This is critical for imagers who use:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Wheels:\u003c\/strong\u003e Easily fits large filter wheels for LRGB or narrowband imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-Axis Guiders (OAGs):\u003c\/strong\u003e Provides enough room to place an OAG in the optical path for precise guiding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotators:\u003c\/strong\u003e Accommodates electronic rotators for automated framing.\u003c\/li\u003e\n\u003c\/ul\u003e\nThis flexibility allows you to build a sophisticated imaging train without worrying about running out of focus travel.\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar FRA400 for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While designed as an astrograph, the Askar FRA400 performs very well for visual use. The included 2\" and 1.25\" adapters allow you to use standard diagonals and eyepieces for wide-field views of star clusters and nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e72mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuintuplet dual ED air-spaced APO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e140mm (from M68x1 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e317mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.56kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight (with rings \u0026amp; plate)\u003c\/td\u003e\n\u003ctd\u003e2.88kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003eM68x1 Male Thread, 2\" Adapter, 1.25\" Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar FRA400 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM68-M48 Conical Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInspection List\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_FRA400C_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967765082397,"sku":"ASK-FRA400","price":1679.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA400-1__17210.1610295680.1280.1280.jpg?v=1684345825"},{"product_id":"askar-fra600-108mm-f-5-6-quintuplet-apo","title":"Askar FRA600 108mm f\/5.6 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e108mm Aperture\u003c\/li\u003e\n\u003cli\u003e600mm Focal Length (f\/5.6)\u003c\/li\u003e\n\u003cli\u003eQuintuplet Flat-Field APO Optical Design\u003c\/li\u003e\n\u003cli\u003e66mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eTotal Weight of 6.5kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA600 108mm f\/5.6 Quintuplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar FRA600 is a purpose-built astrograph featuring a 108mm quintuplet objective that delivers a massive 66mm flat-field image circle at a native f\/5.6 focal ratio. Its Petzval design, incorporating two ED glass elements, requires no separate flattener, providing pinpoint stars across the largest camera sensors from a compact 493mm optical tube. With a total instrument weight of 6.5kg and an expansive 160mm of back focus, the FRA600 is engineered for serious wide-field imagers who demand optical correction and mechanical stability in a single, integrated package.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuintuplet Petzval Optics: A 66mm Flat-Field Image Circle\u003c\/h3\u003e\n\u003cp\u003eThe core of the FRA600 is its 5-element (quintuplet) optical system. This advanced Petzval design uses a front triplet and a rear doublet, including two ED elements, to achieve a high degree of apochromatic correction. The result is a 600mm focal length system that produces a 66mm image circle, fully illuminating and correcting for field curvature on sensors far larger than the APS-C format, including full-frame and medium-format chips.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in Flattener:\u003c\/strong\u003e Unlike traditional refractors that require a separate, correctly-spaced flattener, the FRA600's correction is integral to the design. This eliminates a common source of tilt and spacing errors in the imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApochromatic Correction:\u003c\/strong\u003e The inclusion of two ED (Extra-low Dispersion) glass elements minimizes chromatic aberration, ensuring that stars are tight, high-contrast points without distracting purple or green fringing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Illumination:\u003c\/strong\u003e The rear lens group is intentionally oversized to reduce vignetting and maintain even field illumination out to the edge of the 66mm circle, critical for producing clean, gradent-free images.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Portable 493mm Design with a 6.5kg Payload\u003c\/h3\u003e\n\u003cp\u003eEngineered for both backyard and field use, the FRA600 packs its 108mm aperture into a surprisingly compact and manageable form factor. With its dew shield retracted, the optical tube measures just 493mm in length, making it easy to transport and mount. The total weight, including the supplied tube rings and dovetail, is only 6.5kg, placing it well within the capacity of many modern portable equatorial mounts.\u003c\/p\u003e\n\u003cp\u003eA robust rack-and-pinion focuser provides the rigidity needed to carry heavy imaging trains without slipping or flexure. The focuser features a 1:10 micro-adjustment knob for precise critical focus, a 360-degree rotator for camera framing, and a series of threaded adapters to ensure a solid connection to your equipment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e160mm Back Focus and a Multi-Thread Adapter System\u003c\/h3\u003e\n\u003cp\u003eThe FRA600 provides a generous 160mm of back focus measured from the M90x1 thread on the focuser rotator. This ample distance accommodates complex imaging setups, including off-axis guiders, filter wheels, and rotators. To simplify connections, Askar includes a conical adapter that provides M68x1, M54x0.75, and M48x0.75 male threads, covering the most common standards for flatteners, cameras, and other accessories.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure Threaded Connections:\u003c\/strong\u003e The system is designed around threaded adapters rather than compression rings, preventing camera tilt and ensuring a rigid optical path from the focuser to the sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Adapter Versatility:\u003c\/strong\u003e The conical adapter directly accommodates full-frame cameras with M48 threads and provides larger M54 and M68 threads for connecting to other specialized equipment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 2\" and 1.25\" Adapters:\u003c\/strong\u003e For visual use or connecting planetary cameras, standard 2\" and 1.25\" adapters are also included, making the scope ready for observation out of the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar FRA600 vs. Triplet APOs: The Built-in Flattener Advantage\u003c\/h3\u003e\n\u003cp\u003eWhile a premium 108mm triplet APO can deliver excellent color correction, it almost always requires an external field flattener to produce a flat field for astrophotography. The Askar FRA600's quintuplet design integrates this function into the main optics, offering distinct advantages.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Simplicity:\u003c\/strong\u003e You don't need to purchase and correctly space a separate flattener. The FRA600 is flat by design, simplifying your imaging train and reducing potential points of failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Correction:\u003c\/strong\u003e The optical prescription is a single, cohesive system. The lenses are designed from the ground up to work together, providing correction across a massive 66mm circle that is often difficult to achieve with bolt-on accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost-Effectiveness:\u003c\/strong\u003e When factoring in the cost of a high-quality, large-format field flattener for a comparable triplet, the integrated design of the FRA600 often represents a superior value for the dedicated astro-imager.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the Askar FRA600's 66mm image circle?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003e66mm image circle\u003c\/strong\u003e is exceptionally large, capable of covering full-frame (44mm diagonal) and even some medium-format camera sensors without significant vignetting or distorted stars at the edges. This makes the Askar FRA600 ideal for capturing vast, high-resolution mosaics of nebulae and star fields.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my full-frame DSLR or mirrorless camera to the Askar FRA600?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can connect your camera using the included conical adapter. This adapter terminates in a standard \u003cstrong\u003eM48x0.75 male thread\u003c\/strong\u003e. You will need a camera-specific M48 T-ring to attach your camera body. Ensure your total spacing, including the T-ring's optical depth, matches the standard 55mm back focus from the M48 thread.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar FRA600's quintuplet design better than a triplet with a flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt's a different approach designed for simplicity and optical optimization. The \u003cstrong\u003eintegrated Petzval design\u003c\/strong\u003e of the Askar FRA600 ensures the flattening is perfectly matched to the objective lenses. This eliminates the need to calculate and test spacing for an external flattener, reducing potential sources of tilt and error in your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Askar FRA600 be used for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The Askar FRA600 is an excellent visual instrument. Its apochromatic optics provide high-contrast, color-pure views of planets, the Moon, and deep-sky objects. It includes standard \u003cstrong\u003e2\" and 1.25\" adapters\u003c\/strong\u003e to accommodate any standard diagonal and eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar FRA600 frame large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its \u003cstrong\u003e600mm focal length\u003c\/strong\u003e, the Askar FRA600 is perfectly suited for large celestial objects. When paired with a full-frame camera sensor, it can easily frame the entirety of the North American Nebula (NGC 7000) and the neighboring Pelican Nebula (IC 5070) in a single shot, with plenty of room to spare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 6.5kg weight of the Askar FRA600 suitable for a portable mount like a ZWO AM5?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. At a total weight of \u003cstrong\u003e6.5kg\u003c\/strong\u003e including rings and dovetail, the Askar FRA600 is well within the payload capacity of mounts in the AM5 or Sky-Watcher HEQ5 class. When you add a camera and guide scope, the total imaging payload will remain manageable for these popular and portable mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e108mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e600mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Type\u003c\/td\u003e\n\u003ctd\u003eQuintuplet flat-field APO (including two ED elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e66mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e160mm (from the end of rotator M90x1 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e493mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e6.5kg (Including tube ring \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard Packing Weight\u003c\/td\u003e\n\u003ctd\u003e7.8kg (not including Aluminum case)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack-end Adapter\u003c\/td\u003e\n\u003ctd\u003eM108x1 male thread (no rotator), M90x1 male thread, 2\" adapter \/ 1.25\" adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConical Adapter Threads\u003c\/td\u003e\n\u003ctd\u003eM90×1 to M68×1 to M54x0.75 to M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFRA600 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSectional Conical Tube Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInspection List\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInstruction Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967778779421,"sku":"ASK-FRA600","price":3639.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA600-1__27560.1610296043.1280.1280.png?v=1684345835"},{"product_id":"william-optics-fluorostar-91","title":"William Optics Fluorostar 91","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e91mm Aperture Apochromatic Triplet\u003c\/li\u003e\n\u003cli\u003eFPL-53 Glass for Superior Color Correction\u003c\/li\u003e\n\u003cli\u003eStrehl Ratio Exceeding 0.95\u003c\/li\u003e\n\u003cli\u003e3.3\" Dual-Speed Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003e360° Field Rotator for Image Framing\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask in Lens Cap\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Fluorostar 91 APO Triplet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Fluorostar 91 refractor combines a 91mm FPL-53 triplet objective with apochromatic correction, delivering images that demonstrate a Strehl ratio exceeding 0.95. Its robust 3.3\" rack and pinion focuser supports heavy imaging trains without flexure, while the 4.2 kg base tube weight ensures portability for demanding use in the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e91mm FPL-53 Triplet Optics: Strehl Ratio \u0026gt; 0.95 for High-Contrast Imaging\u003c\/h3\u003e\n\u003cp\u003eAt the core of the Fluorostar 91 is an air-spaced triplet objective featuring premium FPL-53 glass. This design virtually eliminates chromatic aberration, producing tack-sharp stars with pure color rendition. With a guaranteed Strehl ratio of over 0.95, this optic delivers maximum contrast, making it ideal for resolving fine planetary detail and capturing faint nebulosity against a dark sky background.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3.3\" Rack \u0026amp; Pinion Focuser with 360° Field Rotator\u003c\/h3\u003e\n\u003cp\u003eEngineered for astrophotography, the FLT91 is equipped with a heavy-duty 3.3\" rack and pinion focuser. The dual-speed mechanism allows for coarse and fine adjustments, critical for achieving perfect focus with a camera. The entire focuser assembly includes a 360° field rotator for precise image framing, and the optical train terminates in a 2\" Rotolock adapter that provides a secure, self-centering grip on diagonals and cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Focused Design: Integrated Bahtinov Mask \u0026amp; 4.2 kg Tube Weight\u003c\/h3\u003e\n\u003cp\u003eEvery feature of the Fluorostar 91 is designed with the imager in mind. The lens cap contains an integrated Bahtinov mask, simplifying the process of achieving critical focus. An integrated saddle handle provides a secure grip and a mounting point for guide scopes or other accessories. Weighing only 4.2 kg (5.6 kg fully equipped), the FLT91 is easily managed by mid-sized equatorial mounts, creating a powerful yet portable deep-sky imaging system that comes protected in its own soft carry case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the William Optics Fluorostar 91 an \"apochromatic triplet\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Fluorostar 91 is an \u003cstrong\u003eapochromatic triplet\u003c\/strong\u003e because it uses a three-element objective lens, including one element made from high-performance \u003cstrong\u003eFPL-53 glass\u003c\/strong\u003e. This combination brings the red, green, and blue wavelengths of light to the same focal point, eliminating distracting color fringing (chromatic aberration) for sharp, high-contrast images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 360° rotator on the FLT91 help with astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e360° field rotator\u003c\/strong\u003e allows you to change the orientation of your camera without loosening any screws or affecting focus. This is essential for composing your shot, letting you frame celestial objects like the Veil Nebula or the Rho Ophiuchi cloud complex perfectly within your sensor's field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhich field flatteners are compatible with the Fluorostar 91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe William Optics FLT91 is designed to be compatible with several William Optics flatteners, allowing for precise back-focus adjustments and a corrected field for various sensor sizes. Recommended models include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFlat 6AIII\u003c\/li\u003e\n\u003cli\u003eFlat 68III\u003c\/li\u003e\n\u003cli\u003eUltra Flat 91\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fluorostar 91 perform on emission nebulae like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe FLT91's FPL-53 optics provide excellent color correction, especially in the red end of the spectrum where hydrogen-alpha emissions from nebulae like NGC 7000 are dominant. This results in tight, well-defined stars without the blue or violet halos that can plague lesser refractors, allowing the faint details of the nebula to stand out.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the William Optics FLT91 for high-magnification planetary viewing of Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The high Strehl ratio (\u003cstrong\u003e\u0026gt; 0.95\u003c\/strong\u003e) of the Fluorostar 91 ensures maximum contrast and sharpness. When seeing conditions are good, you can push the magnification to view fine details like the cloud bands of Jupiter, the Cassini Division in Saturn's rings, and subtle surface features on Mars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the integrated Bahtinov mask in the FLT91's lens cap?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe integrated \u003cstrong\u003eBahtinov mask\u003c\/strong\u003e is a focusing aid that creates a distinct diffraction pattern around a bright star. When the central spike is perfectly centered between the other two, you have achieved critical focus. This built-in tool saves time and removes the guesswork from focusing, ensuring your astrophotos are as sharp as possible.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eApochromatic Triplet Refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e91mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Glass\u003c\/td\u003e\n\u003ctd\u003eFPL-53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStrehl Ratio\u003c\/td\u003e\n\u003ctd\u003e\u0026gt; 0.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e3.3\" Dual-Speed Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Rotator\u003c\/td\u003e\n\u003ctd\u003e360°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnection\u003c\/td\u003e\n\u003ctd\u003e2\" Rotolock Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFeatures\u003c\/td\u003e\n\u003ctd\u003eIntegrated Saddle Handle, Built-in Bahtinov Mask\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (Tube Only)\u003c\/td\u003e\n\u003ctd\u003e4.2 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (Fully Equipped)\u003c\/td\u003e\n\u003ctd\u003e5.6 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Colors\u003c\/td\u003e\n\u003ctd\u003eGrey, Gold, Red\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Grey","offer_id":44967782088989,"sku":"WO-T-FLT-91SG-RP33","price":3033.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":44967782023453,"sku":"WO-T-FLT-91GD-RP33","price":2877.0,"currency_code":"CAD","in_stock":true},{"title":"Red","offer_id":44967782056221,"sku":"WO-T-FLT-91RD-RP33","price":2877.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Williamo-Optics-FLT91-1.jpg?v=1722276083"},{"product_id":"william-optics-fluorostar-120","title":"William Optics Fluorostar 120","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e120mm Aperture\u003c\/li\u003e\n\u003cli\u003eFPL-53 Triplet Apochromatic Optics\u003c\/li\u003e\n\u003cli\u003e3.3\" Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eBuilt-in Camera Angle Rotator\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eWilliam Optics Fluorostar 120 Triplet APO Refractor\u003c\/h2\u003e\n      \u003cp\u003eThe William Optics Fluorostar 120 refractor combines a 120mm apochromatic triplet objective made with FPL-53 glass and a robust 3.3\" rack and pinion focuser for high-contrast, color-free astrophotography. Its imaging train begins with a native M92 thread and includes adapters for a 2\" RotoLock and a 1.25\" visual back, ensuring broad compatibility with your cameras and accessories.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eA 120mm FPL-53 Triplet for Pure-Color Imaging\u003c\/h3\u003e\n      \u003cp\u003eAt the heart of the Fluorostar 120 lies an air-spaced triplet objective featuring premium FPL-53 glass. This apochromatic design provides outstanding correction of chromatic aberration, eliminating the false color halos around bright stars that can compromise contrast and detail in lesser refractors. The result is a pristine, high-contrast image with pinpoint stars on a dark background, essential for capturing the subtle colors of nebulae and galaxies.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eThe 3.3\" Rack \u0026amp; Pinion Focuser and Rotator System\u003c\/h3\u003e\n      \u003cp\u003eBuilt to handle heavy imaging loads, the heavy-duty 3.3\" rack and pinion focuser provides a rigid, zero-flexure platform for large cameras, filter wheels, and off-axis guiders. A built-in rotator allows you to frame your target perfectly without loosening the camera. The robust build necessary to support a full imaging rig means this is not a lightweight instrument; you will need a substantial mount to carry it effectively.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eNative Connection:\u003c\/strong\u003e The focuser drawtube terminates in a secure M92 thread.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003e2-Inch Adapter:\u003c\/strong\u003e An included adapter steps the connection down to a William Optics 2\" RotoLock, a self-centering system for accessories.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003e1.25-Inch Adapter:\u003c\/strong\u003e For visual use or smaller guide cameras, a final adapter provides a standard 1.25\" visual back.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eIntegrated Design: From M92 Threads to a Losmandy Plate\u003c\/h3\u003e\n      \u003cp\u003eThe Fluorostar 120 is engineered with practical features that streamline your imaging sessions. An integrated, patented Bahtinov Mask, built into the lens cap, is significantly lighter than traditional metal masks and makes achieving critical focus simple. The CNC-machined saddle handle bar not only provides a secure grip but also accepts Vixen-style mounting for guidescopes like the William Optics Uniguide. The entire optical tube assembly is secured by a sturdy Losmandy-style dovetail plate for a solid connection to your equatorial mount.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Fluorostar 120's FPL-53 triplet design ideal for astrophotography?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003eFPL-53 glass\u003c\/strong\u003e in the Fluorostar 120's triplet lens system provides excellent correction of chromatic aberration. This means stars appear as sharp, color-pure points of light without distracting purple or blue halos, resulting in higher contrast and more natural-looking astrophotos.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the integrated Bahtinov mask on the Fluorostar 120 simplify focusing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe patented Bahtinov Mask is built directly into the lens cap of the Fluorostar 120. To use it, you simply uncap the telescope, aim at a bright star, and adjust focus until the central diffraction spike is perfectly centered between the other two. This provides a fast, precise, and repeatable method for achieving critical focus every time you set up.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of imaging train can the Fluorostar 120's 3.3\" focuser support?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe heavy-duty \u003cstrong\u003e3.3\" rack and pinion focuser\u003c\/strong\u003e is designed to handle significant weight without slipping or flexing. It can easily support a full astrophotography setup, including a cooled astronomy camera, a large filter wheel, and an off-axis guider, ensuring your entire imaging train remains stable throughout the night.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Fluorostar 120 perform when imaging the hydrogen-alpha regions in the Cygnus Loop (Veil Nebula)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Fluorostar 120's apochromatic optics excel at imaging emission nebulae like the Veil Nebula. The high-contrast views and excellent color correction allow the fine, filamentary details of the hydrogen-alpha structures to be captured with exceptional clarity against a dark sky background, especially when paired with narrowband filters.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the benefits of the Fluorostar 120's rotator when framing a large target like the Andromeda Galaxy (M31) with a full-frame camera?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe built-in camera angle rotator on the Fluorostar 120 lets you adjust the orientation of your camera without having to loosen any other components in the imaging train. This is crucial for large targets like M31, as it allows you to precisely align the galaxy's long axis with your camera sensor's diagonal for the most compelling composition.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat mounting hardware is included with the William Optics Fluorostar 120?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe William Optics Fluorostar 120 comes with essential mounting hardware for immediate setup. This includes a CNC-machined handle that doubles as a Vixen-style saddle for accessories, mounting rings, and a Losmandy-style dovetail plate for secure attachment to a compatible equatorial mount.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eAvailable Options\u003c\/td\u003e\n\u003ctd\u003eRed, Gold, Space Gray\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eM92 Rotator Adapter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eM92 to 2\" RotoLock Adapter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003e2\" to 1.25\" Visual Back Adapter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":44967917682973,"sku":"WO-A-F120RD-RP33","price":4965.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":44967917650205,"sku":"WO-A-F120GD-RP33","price":4965.0,"currency_code":"CAD","in_stock":true},{"title":"Space Gray","offer_id":44967917715741,"sku":"WO-A-F120TG-RP33","price":4965.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-FLT120-1.jpg?v=1722276874"},{"product_id":"askar-fra500-90mm-f-5-6-quintuplet-apo","title":"Askar FRA500 90mm f\/5.6 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e90mm Aperture Quintuplet APO Optics\u003c\/li\u003e\n\u003cli\u003e500mm Focal Length at f\/5.6\u003c\/li\u003e\n\u003cli\u003eMassive 55mm Flat-Field Image Circle\u003c\/li\u003e\n\u003cli\u003eIncludes Two ED Glass Elements\u003c\/li\u003e\n\u003cli\u003eTotal Assembled Weight of 5.2kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA500 90mm f\/5.6 Quintuplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar FRA500 Astrograph combines a 90mm aperture and 500mm focal length into a portable f\/5.6 optical system designed for serious deep-sky imaging. Its quintuplet air-spaced APO objective, which includes two ED glass elements, delivers a massive 55mm corrected image circle, fully illuminating full-frame sensors and beyond with no additional flattener required. With a total weight of just 5.2kg including rings and plate, the FRA500 is engineered for field portability without compromising on optical stability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuintuplet APO Optics: A Flat 55mm Image Circle\u003c\/h3\u003e\n\u003cp\u003eThe core of the FRA500 is its 5-element Petzval-style optical design, which provides a natively flat field without the need for a separate flattener. The front triplet objective, featuring two pieces of extra-low dispersion (ED) glass, ensures excellent color correction, while the rear doublet corrects for field curvature. This produces sharp, pinpoint stars across an exceptionally wide 55mm image circle, exceeding the diagonal of a standard 44mm full-frame sensor and providing ample room for framing large targets or accommodating larger format cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Design: A 3.5\" Focuser and 158mm of Back Focus\u003c\/h3\u003e\n\u003cp\u003eBuilt for the demands of modern astrophotography, the FRA500 features a robust 3.5-inch rack-and-pinion focuser with 1:10 dual-speed control for precise adjustments, even with heavy camera payloads. The system simplifies imaging train configuration by offering generous, fixed back focus distances. You have 158mm of focus travel from the base of the M86x1 rotator thread and 85mm from the base of the included M48x0.75 conical adapter, eliminating the guesswork of spacing and adapters. This allows you to directly attach your camera, filter wheel, and off-axis guider with confidence.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eField-Ready Mechanics: A Portable 5.2kg Imaging Platform\u003c\/h3\u003e\n\u003cp\u003eEngineered for transport and stability, the FRA500's optical tube weighs only 4.1kg and measures just 452mm with its dew shield extended (407mm retracted). The complete package, including the CNC-machined tube rings, carry handle, and Losmandy-style dovetail plate, comes in at a manageable 5.2kg. This makes the astrograph an ideal choice for portable setups on mid-range equatorial mounts, allowing you to travel to dark-sky sites without sacrificing the optical power needed for high-resolution imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar FRA500 vs. FRA400 \u0026amp; FRA600: Finding the Sweet Spot\u003c\/h3\u003e\n\u003cp\u003eThe FRA500 is strategically positioned within Askar's Flatfield Refractor Astrograph series to offer a balanced solution for many imagers. It provides a significant step up in aperture and light-gathering power over the smaller FRA400, giving you more resolving power for distant galaxies and fine nebula detail. Compared to the larger FRA600, the FRA500 is substantially lighter and more compact, requiring a less demanding mount and making it a far more practical choice for travel and quick setup. For many astrophotographers, the FRA500 represents the ideal compromise between aperture, focal length, and portability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of camera sensor is the Askar FRA500's 55mm image circle for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e55mm image circle\u003c\/strong\u003e is designed to fully illuminate and correct for sensors larger than standard full-frame (44mm diagonal). This makes the Askar FRA500 an excellent match for full-frame DSLR\/mirrorless cameras and dedicated astronomy cameras with large sensors like the ZWO ASI6200 or QHY600, ensuring pinpoint stars and no vignetting at the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate field flattener for the Askar FRA500?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Askar FRA500 features an integrated \u003cstrong\u003equintuplet (5-element) Petzval optical design\u003c\/strong\u003e. This design inherently corrects for field curvature, providing a flat field across the entire 55mm image circle without the need for any additional flattener or reducer lenses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar FRA500 frame large targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its \u003cstrong\u003e500mm focal length\u003c\/strong\u003e, the Askar FRA500 provides an ideal image scale for large deep-sky objects. When paired with a full-frame sensor, it can comfortably frame the entirety of the Andromeda Galaxy (M31), the North American Nebula (NGC 7000), or the Veil Nebula complex in a single shot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Askar FRA500's 5.2kg weight?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe total imaging weight is \u003cstrong\u003e5.2kg\u003c\/strong\u003e for the telescope, rings, and plate. Once you add a guide scope, camera, and other accessories, your total payload will likely be around 7-9kg. A mid-range equatorial mount with a payload capacity of 13kg (30 lbs) or more, such as a Sky-Watcher HEQ5 or iOptron CEM26\/GEM28, would be a stable platform for imaging with the FRA500.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the 85mm and 158mm back focus distances on the FRA500 for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThese are the two primary connection options for your imaging train. The \u003cstrong\u003e158mm distance\u003c\/strong\u003e is measured from the M86x1 thread on the rotator, giving you maximum space for complex setups. The \u003cstrong\u003e85mm distance\u003c\/strong\u003e is measured from the M48x0.75 thread on the included conical adapter, which is a more common connection for DSLRs or cameras with integrated filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar FRA500 for imaging the Orion Nebula (M42) from a portable setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The Orion Nebula (M42) is a perfect target for this telescope. Its f\/5.6 focal ratio is fast enough to capture faint nebulosity quickly, and its 500mm focal length will resolve fine details in the Trapezium region. Given its total weight of 5.2kg, the FRA500 is an excellent choice for a high-performance portable imaging rig.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e90mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e500mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuintuplet air-spaced APO (including two ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e85mm (from M48x0.75 thread); 158mm (from M86x1 thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Thread\u003c\/td\u003e\n\u003ctd\u003eM86x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConical Adapter\u003c\/td\u003e\n\u003ctd\u003eM48x0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e452mm (407mm with dew shield contracted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e4.1kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e5.2kg (including tube rings \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFRA500 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar Losmandy Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eConical Extender (M48x0.75)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44967965425949,"sku":"ASK-FRA500","price":2799.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA500__40204.1641245267.1280.1280.jpg?v=1684347331"},{"product_id":"askar-fra300-60mm-f-5-quintuplet-apo","title":"Askar FRA300 Pro 60mm f\/5 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e60mm Aperture Quintuplet APO Astrograph\u003c\/li\u003e\n\u003cli\u003e300mm Focal Length at a Fast f\/5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003eIntegrated Petzval Corrector Design\u003c\/li\u003e\n\u003cli\u003e2.5\" Dual-Speed Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eTotal Assembled Weight: 3.12kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar FRA300 Pro 60mm f\/5 Quintuplet APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar FRA300 Pro combines a 60mm aperture with a fast f\/5 native focal ratio to create an incredibly portable imaging platform. Its 300mm focal length is ideal for wide-field targets, while the advanced quintuplet Petzval optical design illuminates a 44mm full-frame image circle with sharp stars edge-to-edge. Weighing just 2.26kg for the optical tube, the FRA300 Pro is built for imagers who need uncompromising optical quality in a package that travels anywhere.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e60mm f\/5 Quintuplet Petzval Optics with a 44mm Image Circle\u003c\/h3\u003e\n\u003cp\u003eThe optical system is the core of the FRA300 Pro. Its five-element, fully air-spaced design includes one ED glass element to deliver apochromatic performance with no false color. The f\/5 focal ratio gathers light significantly faster than typical f\/6 or f\/7 refractors, reducing your total exposure time on faint nebulae.\u003c\/p\u003e\n\u003cp\u003eBecause it is a native Petzval design, the flattener is built directly into the optical tube. This removes the need for complex back-focus calculations; as long as your camera sensor is near the specified 67mm to 71mm working distance, you will achieve a corrected field across a full-frame 44mm sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e2.5\" Rack-and-Pinion Focuser and 3.12kg Assembly\u003c\/h3\u003e\n\u003cp\u003eTo support full-frame camera packages, the FRA300 Pro is equipped with a heavy-duty 2.5-inch rack-and-pinion focuser. It features dual-speed 10:1 reduction knobs for precise adjustments and can handle the weight of a filter wheel and cooled camera without slipping. The entire optical tube assembly is just 303mm long and weighs 2.26kg (3.12kg with rings and plate), making it an ideal match for portable tracking mounts.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e360° Rotator:\u003c\/strong\u003e The rear of the focuser includes a 360° rotator, allowing you to frame your target perfectly without rotating your entire imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machined Rings:\u003c\/strong\u003e The included tube rings, handle, and 300mm Vixen-style dovetail plate are CNC machined for a secure and lightweight fit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated Corrector and Full-Frame Connectivity\u003c\/h3\u003e\n\u003cp\u003eThe FRA300 Pro is built as a complete imaging system, ready for your camera out of the box. The rear of the focuser terminates in a standard M48x0.75 male thread, but Askar also includes M54 and M42 adapters to ensure compatibility with a wide range of cameras and accessories. This flexibility allows you to achieve the optimal connection for your specific setup.\u003c\/p\u003e\n\u003cp\u003eThe fixed optical corrector simplifies your workflow immensely. Unlike systems requiring separate flatteners or reducers, the FRA300 Pro delivers its corrected 44mm image circle natively. You simply attach your camera, focus, and begin imaging, confident that the field is flat and the stars are sharp.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the Petzval design of the Askar FRA300 Pro mean for my imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \u003cstrong\u003ePetzval\u003c\/strong\u003e design means the field-flattening optical elements are built directly into the main telescope tube. For you, this eliminates the need to buy a separate flattener and, more importantly, removes the headache of calculating a precise back-focus distance. As long as your camera's sensor is within the recommended range, the 44mm image circle will be fully corrected.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the FRA300 Pro frame the Andromeda Galaxy (M31) with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its \u003cstrong\u003e300mm focal length\u003c\/strong\u003e, the Askar FRA300 Pro is perfectly suited for large targets like the Andromeda Galaxy (M31). On a full-frame sensor (36x24mm), it provides a field of view of approximately 6.8° x 4.5°, which is wide enough to capture the entire galaxy and its satellite companions, M32 and M110, with ample space for framing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the f\/5 focal ratio on the FRA300 Pro?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe fast \u003cstrong\u003ef\/5 focal ratio\u003c\/strong\u003e allows the telescope to collect the same amount of light in a shorter period compared to slower f\/6 or f\/7 systems. This means you can achieve deep signal on faint nebulae with shorter individual sub-exposures, reducing the demands on your mount's tracking accuracy and letting you complete projects faster.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 60mm aperture of the FRA300 Pro enough for faint deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. While aperture is important, the fast f\/5 focal ratio is key for imaging faint, extended objects like the North America Nebula (NGC 7000) or the Veil Nebula complex. The \u003cstrong\u003e60mm aperture\u003c\/strong\u003e provides high-resolution detail, while the f\/5 speed efficiently captures faint nebulosity, making it a powerful tool despite its compact size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Askar FRA300 Pro's 3.12kg weight?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a total weight of only \u003cstrong\u003e3.12kg\u003c\/strong\u003e including the rings and dovetail plate, the FRA300 Pro is an excellent match for high-quality portable tracking mounts. Mounts rated for a payload of 5-7kg (11-15 lbs) or more, such as a Sky-Watcher Star Adventurer GTI or ZWO AM3, will provide a very stable platform for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar FRA300 Pro for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the FRA300 Pro is optically optimized as an astrograph for imaging, it can be used for low-power visual observation with a 1.25\" or 2\" diagonal and eyepiece. However, its primary strength lies in providing a flat, corrected field for camera sensors, which is a different design goal than a dedicated visual telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Design\u003c\/td\u003e\n\u003ctd\u003eQuintuplet fully air-spaced Petzval APO (with one ED glass element)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm (Full-Frame)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus \/ Working Distance\u003c\/td\u003e\n\u003ctd\u003e71mm from M42×0.75 male thread\u003cbr\u003e67mm from M48×0.75 male thread\u003cbr\u003e71mm from M54×1 male thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Thread (Focuser)\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 Male Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e303mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.26kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e3.12kg (Including tube ring \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFRA300 Pro OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 300mm Vixen Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54x0.75 Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM42x0.75 Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWarranty Card\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInstruction Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Drivers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968028897565,"sku":"ASK-FRA300","price":1329.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-FRA300-Pro-1__97100.1656532375.1280.1280.jpg?v=1684348071"},{"product_id":"askar-107phq-f-7-quadruplet-apo","title":"Askar 107PHQ f\/7 Quadruplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e107mm Quadruplet APO Optical Design\u003c\/li\u003e\n\u003cli\u003e749mm Focal Length at f\/7\u003c\/li\u003e\n\u003cli\u003e44mm Corrected Image Circle for Full-Frame Sensors\u003c\/li\u003e\n\u003cli\u003eIntegrated Field Flattener for Simplified Imaging\u003c\/li\u003e\n\u003cli\u003e6.9kg Total Weight with Rings and Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 107PHQ f\/7 Quadruplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar 107PHQ f\/7 Quadruplet APO Astrograph integrates a field flattener directly into its 107mm quadruplet optical design, delivering a perfectly flat 44mm image circle without the need for complex accessories. Its 749mm focal length resolves fine detail in distant galaxies, while the air-spaced objective with two ED glass elements ensures superb color correction from edge to edge. At a total weight of just 6.9kg including its 300mm Vixen dovetail, the 107PHQ is a complete, grab-and-go imaging platform for full-frame sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 44mm Flat Field with Zero Back-Focus Hassle\u003c\/h3\u003e\n\u003cp\u003eThe core of the 107PHQ is its Petzval-like quadruplet design, which places a correcting lens group permanently within the optical tube. This eliminates the single most common point of failure in astrophotography setups: calculating and setting the correct back-focus distance. With the 107PHQ, you simply attach your camera using the included adapters, achieve focus, and the entire 44mm image circle is corrected, ensuring pinpoint stars across a full-frame sensor without any guesswork.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ef\/7 Imaging at 749mm for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe 749mm focal length and f\/7 ratio provide an ideal image scale for a vast range of deep-sky objects, from the spiral arms of the Andromeda Galaxy (M31) to the turbulent structures within the Orion Nebula (M42). The two ED glass elements in the objective lens suppress chromatic aberration, rendering stars as sharp, color-pure points. This optical system is engineered to deliver high-contrast images that retain fine detail, even when using modern high-resolution astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 6.9kg Imaging Platform with 300mm Vixen Plate\u003c\/h3\u003e\n\u003cp\u003eEngineered for stability, the Askar 107PHQ weighs 5.7kg as an OTA and 6.9kg fully equipped with its included tube rings, handle, and 300mm Vixen-style dovetail plate. This manageable weight makes it compatible with a wide range of mid-sized equatorial mounts. The retractable dew shield allows the scope to shrink to a compact 603mm for transport, extending to 754mm to block stray light and prevent dew formation during long imaging sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVersatile Connectivity from M86 to M48\u003c\/h3\u003e\n\u003cp\u003eThe 107PHQ includes a comprehensive set of four adapters to connect virtually any imaging device. The focuser terminates in a native M86×1 thread, which can be stepped down using the included rings to M68×1, M54×0.75, M52×0.75, and finally to the universal M48×0.75 thread used by most T-rings and dedicated astronomy cameras. The final M48 adapter is also threaded to accept standard 2-inch filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar 107PHQ vs. Triplet + Flattener: The Integrated Advantage\u003c\/h3\u003e\n\u003cp\u003eAn imager considering a traditional 100-110mm APO triplet must also purchase a separate, matched field flattener. This introduces complexity, potential for tilt, and critical back-focus spacing requirements that can change with filters or other accessories.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompetitor's Advantage:\u003c\/strong\u003e A triplet with a separate flattener\/reducer offers more flexibility in focal length. You can image at the native focal length or a reduced, faster focal ratio.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar 107PHQ's Advantage:\u003c\/strong\u003e The 107PHQ offers perfect, factory-set field correction out of the box. There is zero chance of spacing errors, and the rigid, integrated design minimizes potential tilt, resulting in a more reliable and frustration-free imaging experience, especially for those new to the hobby.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"PHQ\" in Askar 107PHQ mean for my astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"PHQ\" signifies a \u003cstrong\u003equadruplet Petzval-style optical design\u003c\/strong\u003e with a built-in field flattener. This means you do not need to buy a separate flattener or worry about calculating back-focus distance. You simply attach your camera and the entire 44mm image circle is corrected for sharp, flat-field images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Askar 107PHQ fully illuminate my full-frame camera sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Askar 107PHQ is designed with a corrected \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to cover standard full-frame sensors (typically 43.3mm diagonal) without vignetting or distorted stars at the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 107PHQ perform on a target like the Triangulum Galaxy (M33)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 749mm focal length of the Askar 107PHQ is an excellent match for large galaxies like M33. Paired with a full-frame or APS-C camera, it will frame the galaxy beautifully, with enough image scale to resolve individual HII regions and the delicate spiral arm structure.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the 6.9kg Askar 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a total weight of 6.9kg (15.2 lbs) including rings and the dovetail plate, the Askar 107PHQ works well on equatorial mounts with a payload capacity of 30 lbs (13.6 kg) or more. This ensures stable tracking for long-exposure astrophotography. Examples include the Sky-Watcher EQ6-R Pro or Celestron AVX.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 107PHQ suitable for visual observation of planets like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While designed as an astrograph, its APO quadruplet optics provide sharp, high-contrast, and color-free views visually. With a 749mm focal length, you can use high-magnification eyepieces to easily observe the cloud bands of Jupiter, the rings of Saturn, and details on the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat adapters do I need to connect my DSLR to the Askar 107PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 107PHQ includes a set of adapters that terminates in a standard \u003cstrong\u003eM48x0.75 male thread\u003c\/strong\u003e. All you need to add is an M48 T-ring specific to your camera brand (e.g., Canon, Nikon, Sony) to connect your DSLR or mirrorless camera directly to the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e107mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e749mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuadruplet air-spaced APO (with two ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e603mm (dew shield contracted), 754mm (dew shield extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e5.7kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e6.9kg (Including tube rings \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Thread Adapters\u003c\/td\u003e\n\u003ctd\u003eM86×1 to M68×1, M68×1 to M54×0.75, M54×0.75 to M52×0.75, M52×0.75 to M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinal Adapter Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 (with M48 filter thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Adapters\u003c\/td\u003e\n\u003ctd\u003eFour-piece photographic adapter set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Contents\u003c\/td\u003e\n\u003ctd\u003eA 107PHQ OTA, a pair of tube rings, a handle, an Askar 300mm Vixen dovetail plate, a set of four-piece photographic adapters, a manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 107PHQ OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e300mm Vixen-Style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eFour-Piece Photographic Adapter Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInstruction Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_2025_First_Half_Product_Collection_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968035516701,"sku":"ASK-107PHQ","price":3219.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-107PHQ-1__20124.1657565714.1280.1280.jpg?v=1684348151"},{"product_id":"askar-130phq-f-7-quadruplet-apo","title":"Askar 130PHQ f\/7 Quadruplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e130mm Aperture Quadruplet APO Optics\u003c\/li\u003e\n\u003cli\u003e1000mm Focal Length at f\/7.7\u003c\/li\u003e\n\u003cli\u003eBuilt-in Field Flattener\u003c\/li\u003e\n\u003cli\u003e60mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eTotal Assembled Weight of 13kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 130PHQ f\/7.7 Quadruplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar 130PHQ is an astrograph engineered for large-format imaging, integrating a 130mm quadruplet air-spaced APO objective with a native focal length of 1000mm. Its f\/7.7 optical system, which includes two ED glass elements, is designed to deliver a massive 60mm flat-field image circle without requiring an external flattener. This design simplifies your imaging train and ensures pinpoint stars across full-frame and medium-format sensors, all within a robust optical tube assembly that weighs 10.5kg.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e130mm f\/7.7 Quadruplet APO Optics with 2 ED Elements\u003c\/h3\u003e\n\u003cp\u003eThe core of the 130PHQ is its advanced optical design. The 130mm aperture gathers significant light for resolving faint details in galaxies and nebulae, while the 1000mm focal length provides the image scale needed for medium to small-sized deep-sky objects. The quadruplet objective, featuring two extra-low dispersion (ED) glass elements, provides excellent correction of chromatic aberration, eliminating false color and ensuring sharp, high-contrast images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 60mm Flat-Field Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eUnlike conventional refractors that require separate field flatteners and complex backfocus calculations, the 130PHQ has the flattener built directly into the optical design. This Petzval-like configuration produces a natively flat 60mm image circle, large enough to cover full-frame (36x24mm) and even larger medium-format sensors without edge-of-field star distortion or vignetting. You can simply attach your camera using the included adapters, focus, and capture perfectly corrected images from corner to corner.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e13kg Total Weight with Robust Focuser and Adapters\u003c\/h3\u003e\n\u003cp\u003eBuilt for stability, the Askar 130PHQ has an OTA weight of 10.5kg and a total weight of 13kg with the included tube rings and 300mm Losmandy-style dovetail plate. This requires a substantial equatorial mount to carry effectively. The rear of the telescope features a heavy-duty focuser and a comprehensive set of four adapters, stepping down from the native M86x1 thread to M68x1, M54x0.75, and finally a standard M48x0.75 thread for connecting most astronomy cameras and filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar 130PHQ vs. 107PHQ: Aperture, Focal Length, and Portability\u003c\/h3\u003e\n\u003cp\u003eThe 130PHQ is the larger sibling to the popular Askar 107PHQ, offering key differences for imagers choosing between them.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvantage 107PHQ:\u003c\/strong\u003e The 107PHQ is significantly lighter and more portable, making it suitable for smaller, less demanding mounts. Its faster f\/7 focal ratio also allows for slightly shorter exposure times on wide-field targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvantage 130PHQ:\u003c\/strong\u003e The 130PHQ's primary advantage is its 130mm aperture, which provides nearly 50% more light-gathering area than the 107mm objective. This translates to higher resolution and the ability to capture fainter details. Its 1000mm focal length also delivers a tighter field of view, ideal for framing smaller galaxies and planetary nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a separate field flattener for the Askar 130PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Askar 130PHQ is a flat-field astrograph with a built-in corrector lens as part of its quadruplet optical design. It produces a corrected \u003cstrong\u003e60mm image circle\u003c\/strong\u003e without any additional accessories, simplifying your imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size camera sensor can the Askar 130PHQ fully illuminate?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 60mm image circle is large enough to cover \u003cstrong\u003efull-frame sensors\u003c\/strong\u003e (like those in DSLRs or dedicated cameras such as the ZWO ASI6200) and even some \u003cstrong\u003emedium-format sensors\u003c\/strong\u003e with excellent correction to the corners.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of equatorial mount is required to use the Askar 130PHQ for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a total weight of \u003cstrong\u003e13kg (28.7 lbs)\u003c\/strong\u003e for the optical tube, rings, and dovetail, plus the additional weight of a guide scope, camera, and other accessories, a mount in the EQ6\/CEM60 class or larger is strongly recommended for stable, long-exposure imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 1000mm focal length of the Askar 130PHQ affect imaging the Triangulum Galaxy (M33)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 1000mm focal length provides excellent image scale for capturing details within M33, such as its spiral arms and HII regions. When paired with a full-frame sensor, you can frame the entire galaxy comfortably, while a smaller APS-C sensor will provide a tighter, more magnified view of its core.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my ZWO camera with an M42 thread to the Askar 130PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 130PHQ includes a set of adapters that terminate in a standard \u003cstrong\u003eM48x0.75 male thread\u003c\/strong\u003e. To connect a camera with an M42 \"T-thread,\" you will need a simple M48-to-M42 step-down ring, which is a common and widely available accessory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 130PHQ suitable for visual observation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile optimized for imaging, the 130PHQ is an excellent visual instrument. Its 130mm APO objective provides sharp, color-free views of the Moon, planets, and bright deep-sky objects. You will need to add a diagonal and eyepieces to use it visually.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture Size\u003c\/td\u003e\n\u003ctd\u003e130mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1000mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuadruplet air-spaced APO (with two ED glass elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e10.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e13kg (including tube rings \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e842.5mm to 1061.5mm depending on dew shield and adapter configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Adapters\u003c\/td\u003e\n\u003ctd\u003eM86×1 -\u0026gt; M68×1 -\u0026gt; M54×0.75 -\u0026gt; M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e130PHQ OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar Losmandy 300mm Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4-Piece Photographic Adapter Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_SQA130_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968043282717,"sku":"ASK-130PHQ","price":4899.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-130PHQ-Quadruplet-APO__33186.1661624750.1280.1280.jpg?v=1684348250"},{"product_id":"sharpstar-z4-100mm-f-5-5-sextuplet-apo-astrograph","title":"Sharpstar Z4 100mm f\/5.5 Sextuplet Apo Astrograph","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e100mm Aperture\u003c\/li\u003e\n\u003cli\u003ef\/5.5 Focal Ratio \/ 550mm Focal Length\u003c\/li\u003e\n\u003cli\u003eSextuplet Air-Spaced APO Optical Design\u003c\/li\u003e\n\u003cli\u003e36mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003e4.3kg Net Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpstar Z4 100mm f\/5.5 Sextuplet Apo Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Sharpstar Z4 100mm f\/5.5 Sextuplet Apo Astrograph integrates a fast optical system and a field flattener into a single, compact instrument. Its 100mm aperture and 550mm focal length provide a wide field of view ideal for large nebulae and star fields. The sextuplet air-spaced APO design, which includes two ED glass elements, produces a 36mm corrected image circle, while the entire optical tube assembly has a net weight of only 4.3kg and a total length of 482mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSextuplet Optics: A 100mm f\/5.5 Flat-Field System\u003c\/h3\u003e\n\u003cp\u003eThe Z4's optical core is a six-element lens system, arranged in two groups of three, that is designed for color-free, high-contrast imaging. With a fast focal ratio of f\/5.5, you can capture significant signal in shorter sub-exposure times, reducing demands on your mount's tracking. The inclusion of two extra-low dispersion (ED) glass elements minimizes chromatic aberration, ensuring that stars are tight and focused without distracting color fringes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated Design: 36mm Image Circle with Zero Back-Focus Calculation\u003c\/h3\u003e\n\u003cp\u003eUnlike traditional refractors that require separate flatteners and precise spacing, the Sharpstar Z4 is a self-flattened astrograph. This design eliminates the guesswork of achieving a flat field; simply bring your camera to focus and the optical system delivers sharp stars across its entire 36mm image circle. This is a significant advantage for imagers who want to spend less time on setup and more time acquiring data. The 36mm circle fully illuminates APS-C sensors and is compatible with many full-frame cameras with minor, correctable vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMechanics \u0026amp; Connectivity: 4.3kg OTA with a 4-Piece Adapter Set\u003c\/h3\u003e\n\u003cp\u003eWeighing only 4.3kg, the Z4 is compatible with a wide range of mid-capacity equatorial mounts, making it an excellent choice for portable setups. The instrument includes a robust focuser with a 360° rotator, allowing you to frame your target perfectly without rotating your camera and upsetting cable management. To ensure immediate compatibility with your imaging train, Sharpstar includes a 4-piece adapter set that steps down to a standard M48×0.75 male thread, which also features an internal thread for mounting 2\" filters.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Build:\u003c\/strong\u003e The 4.3kg net weight makes balancing easy and is gentle on your mount's payload capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Adapters:\u003c\/strong\u003e The package provides a complete set of adapters to connect your camera right out of the box.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter-Ready:\u003c\/strong\u003e The final M48 adapter is threaded to accept standard 2\" astronomy filters for nebula or light pollution imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"self-flattened\" mean for the Sharpstar Z4 astrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA self-flattened design means the field-flattening optics are integrated directly into the main telescope body. Unlike other refractors, the \u003cstrong\u003eSharpstar Z4\u003c\/strong\u003e does not require a separate field flattener accessory or complex back-focus calculations to achieve sharp stars across the field. You just need to achieve focus with your camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat size camera sensor is the Sharpstar Z4's 36mm image circle suitable for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSharpstar Z4's\u003c\/strong\u003e 36mm corrected image circle is ideal for cameras with \u003cstrong\u003eAPS-C sized sensors\u003c\/strong\u003e, which it will illuminate fully without vignetting. It can also be used with many full-frame (36mm x 24mm) sensor cameras, though some minor vignetting may be present at the extreme corners, which can typically be corrected with flat frames.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Sharpstar Z4 perform on a large target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSharpstar Z4\u003c\/strong\u003e is an excellent choice for M31. Its 550mm focal length provides a wide field of view that can frame the entire galaxy, including its satellite companions M32 and M110, when paired with a full-frame or APS-C camera. The fast f\/5.5 optics will help capture the faint outer dust lanes with reasonable exposure times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Sharpstar Z4's 4.3kg weight suitable for a portable mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, at just \u003cstrong\u003e4.3kg (net weight)\u003c\/strong\u003e, the \u003cstrong\u003eSharpstar Z4\u003c\/strong\u003e is well-suited for many popular portable equatorial mounts, such as the Sky-Watcher HEQ5 or iOptron CEM26. Its light weight leaves ample capacity for a guide scope, camera, and other accessories without straining the mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I attach a 2-inch filter to the Sharpstar Z4 imaging train?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe included 4-piece adapter set for the \u003cstrong\u003eSharpstar Z4\u003c\/strong\u003e terminates in an M54×0.75-to-M48×0.75 adapter. This final M48 adapter has an internal female thread designed to accept standard \u003cstrong\u003e2-inch (M48×0.75) filters\u003c\/strong\u003e directly, placing the filter at the correct distance within the optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Sharpstar Z4 require a separate field flattener or reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The \u003cstrong\u003eSharpstar Z4\u003c\/strong\u003e is an integrated astrograph with a built-in flattener. You do not need to purchase a separate one. The optical design is fixed at a focal length of 550mm and f\/5.5; reducers are not part of its intended design.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e100mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e550mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eSextuplet fully air-spaced APO (including two ED glasses)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e36mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e482mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e4.3kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e5.6kg (without aluminum box)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Thread\u003c\/td\u003e\n\u003ctd\u003eM48×0.75 male thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Adapters\u003c\/td\u003e\n\u003ctd\u003eM86×1-M68×1, M68×1-M54×0.75, M54×0.75-M54×0.75, M54×0.75-M48×0.75 (with 2\" filter thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSharpstar Z4 100mm OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Ring\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4-Piece Photographic Adapter Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eWarranty Card\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SharpStar_Z4_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":44968043381021,"sku":"SSO-Z4","price":3233.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/SharpStar-Z4-Sextuplet-APO-Astrograph__53862.1661627276.1280.1280.jpg?v=1684348251"},{"product_id":"askar-80phq-f-7-quadruplet-apo","title":"Askar 80PHQ f\/7 Quadruplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e80mm Aperture\u003c\/li\u003e\n\u003cli\u003e600mm Focal Length (f\/7.5)\u003c\/li\u003e\n\u003cli\u003eQuadruplet APO Optics with 2 ED Elements\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003e3.9kg Optical Tube Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 80PHQ f\/7.5 Quadruplet APO Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe Askar 80PHQ f\/7.5 Quadruplet APO astrograph integrates an 80mm objective and a 600mm focal length to deliver a perfectly flat 44mm image circle without an external corrector. This self-contained optical design includes two ED glass elements and weighs just 3.9kg as an optical tube assembly, or 4.7kg with its included rings and 300mm Vixen dovetail plate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eQuadruplet APO Optics: A 44mm Flat Field at 600mm\u003c\/h3\u003e\n\u003cp\u003eThe 80PHQ's optical system is a 3+1 quadruplet design with two pieces of extra-low dispersion (ED) glass, engineered to eliminate chromatic aberration. Unlike standard telescopes that require a separate field flattener, the corrector element is built directly into the optical path, ensuring a 44mm image circle that is perfectly flat and corrected right out of the box. This design simplifies your imaging train and removes the need to calculate back focus; simply attach your camera using the included adapters for pinpoint stars across a full-frame sensor.\u003c\/p\u003e\n\u003cp\u003eWith a 600mm focal length and an f\/7.5 focal ratio, the Askar 80PHQ is optimized for capturing detailed views of medium-sized deep-sky objects. It provides the ideal image scale for resolving features in galaxies like the Triangulum Galaxy (M33) or framing intricate nebulae like the Dumbbell Nebula (M27).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: A 3.9kg OTA with a 3-inch Focuser\u003c\/h3\u003e\n\u003cp\u003eEngineered for astrophotography, the 80PHQ is both robust and lightweight. The optical tube itself weighs only 3.9kg, and the total package with rings, handle, and Vixen plate comes in at a manageable 4.7kg. This low weight makes it an excellent match for a wide range of portable equatorial mounts without sacrificing stability.\u003c\/p\u003e\n\u003cp\u003eThe instrument features a heavy-duty 3-inch dual-speed rack-and-pinion focuser capable of handling large cameras and filter wheels without flexure. A 360° rotator with a precision scale allows for effortless framing of your target, while the clamshell-style tube rings provide a secure grip that can be adjusted without tools.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar 80PHQ vs. 107PHQ: The 4.7kg Portable Deep-Sky Solution\u003c\/h3\u003e\n\u003cp\u003eWhile the larger Askar 107PHQ is an exceptional instrument, its 5.7kg weight and longer tube can be demanding on mid-size mounts. The Askar 80PHQ delivers the same flat-field, full-frame imaging philosophy of the PHQ series in a significantly more compact and portable package.\u003c\/p\u003e\n\u003cp\u003eAt just 4.7kg fully equipped, the 80PHQ is the clear choice for astronomers who prioritize portability, use lighter-duty mounts, or are looking for a high-end travel scope. You get the same hassle-free, corrected optical system without the demanding weight and size of its larger sibling, making it a versatile performer for both backyard and dark-site imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener for the Askar 80PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Askar 80PHQ is a \"flat-field\" astrograph with a built-in corrector lens as part of its quadruplet optical design. It produces a corrected 44mm image circle without any additional accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the back focus of the Askar 80PHQ?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou do not need to calculate back focus. The included set of four photographic adapters is designed to place your camera's sensor at the optimal focal plane. Simply connect your M54 or M48 camera to the end of the adapter chain for a sharp, flat field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 80PHQ frame the Pleiades (M45) with an APS-C camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 600mm focal length of the Askar 80PHQ provides an excellent image scale for large star clusters like the Pleiades (M45). With a typical APS-C sensor, you will be able to frame the core of the cluster and its surrounding nebulosity beautifully, resolving individual stars as sharp points to the edge of the frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan my HEQ5 mount handle the Askar 80PHQ for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. With a total weight of only 4.7kg including rings and dovetail, the Askar 80PHQ is well within the capacity of an HEQ5 or similar mid-range equatorial mount for stable, long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the different lengths listed for the Askar 80PHQ (450mm vs 480mm) refer to?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe length of the telescope depends on which adapter is attached to the rear and the position of the retractable dew shield. The 450mm length is with the 1.25\" eyepiece holder attached and the dew shield retracted, while the 480mm length is with the 4-piece photo adapter set attached and the dew shield retracted. The dew shield provides an additional 90mm of extension.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the \"two ED glass\" in the Askar 80PHQ's objective do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe two \u003cstrong\u003eExtra-low Dispersion (ED)\u003c\/strong\u003e glass elements significantly reduce chromatic aberration, which is the color fringing (typically purple or blue halos) seen around bright stars in simpler refractors. This results in sharper stars, higher contrast, and more accurate color rendition in your images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e600mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuadruplet air-spaced APO with two ED elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e3.9kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e4.7kg (including tube rings \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e450mm to 570mm (depending on configuration)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003eM76×1, M68×1, M54×0.75, M48×0.75 (with internal filter thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 80PHQ OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 300mm Vixen Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e4-Piece Photographic Adapter Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInstruction Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968051310877,"sku":"ASK-80PHQ","price":2099.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-80PHQ__46044.1678413489.1280.1280.jpg?v=1684348359"},{"product_id":"william-optics-gran-turismo-wifd-81","title":"William Optics Gran Turismo WIFD 81","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e81mm Aperture Triplet Apochromatic Refractor\u003c\/li\u003e\n\u003cli\u003eFPL-53 Ohara Glass for Superior Color Correction\u003c\/li\u003e\n\u003cli\u003eWilliam Optics Internal Focusing Design (WIFD)\u003c\/li\u003e\n\u003cli\u003eIncluded Dual-Side Vixen\/Arca-Swiss Mounting Plate\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask Focusing Aid\u003c\/li\u003e\n\u003cli\u003ePadded Soft Carry Case for Transport and Storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Gran Turismo WIFD 81 Apochromatic Refractor\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Gran Turismo WIFD 81 combines an 81mm triplet objective with a robust M92 threaded connection for a stable, zero-flexure imaging train. The included M92 to M63 adapter ensures compatibility with a wide range of correctors and cameras, making this apochromat a versatile core for any astrophotography setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e81mm FPL-53 Triplet: Apochromatic Optics for Pure Color\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Gran Turismo 81 is an air-spaced triplet objective featuring premium FPL-53 glass from Ohara, Japan. This design achieves apochromatic correction, virtually eliminating chromatic aberration for true-to-life color and razor-sharp stars. You see no distracting purple fringing on bright stars like Vega or Sirius, only clean, high-contrast detail whether you're observing visually or imaging deep-sky objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWIFD Focuser \u0026amp; M92 Adapter: A Zero-Flexure Imaging Platform\u003c\/h3\u003e\n\u003cp\u003eThe proprietary William Optics Internal Focusing Design (WIFD) provides an exceptionally smooth and stable focusing mechanism critical for astrophotography. Unlike traditional focusers that move a drawtube, the WIFD moves the lens assembly internally, meaning your camera and imaging train remain fixed. This design eliminates sag and tilt, preserving perfect alignment even with heavy equipment attached to the M92 threaded rear port.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Hardware:\u003c\/strong\u003e The telescope arrives ready for the field with mounting rings, a sturdy handle bar, and a versatile dual-side plate compatible with both Vixen and Arca-Swiss style saddles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFocusing Perfected:\u003c\/strong\u003e A Bahtinov mask is cleverly integrated into the lens cap, providing a simple and precise way to achieve critical focus every time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImaging Train Note:\u003c\/strong\u003e For serious astrophotography, a dedicated field flattener is required to achieve a perfectly flat field across the entire sensor. This is an optional accessory and is not included with the optical tube.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the William Optics Gran Turismo WIFD 81 ideal for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eGran Turismo WIFD 81\u003c\/strong\u003e is built for imaging. Its core strengths are the FPL-53 triplet lens for color-free images and the WIFD internal focuser. The WIFD prevents focuser sag and tilt, which is a common issue with external focusers when using heavy cameras and filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the GT81 WIFD perform on a target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eGT81 WIFD\u003c\/strong\u003e is an excellent wide-field instrument for large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000). With a compatible field flattener, you can capture these expansive objects in a single frame with sharp stars from edge to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI have a mount with a Vixen-style saddle. Do I need to buy a new dovetail for the GT81 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, you do not. The \u003cstrong\u003eGT81 WIFD\u003c\/strong\u003e includes a dual-side mounting plate that is compatible with both standard Vixen-style saddles and Arca-Swiss saddles, offering broad compatibility with most astronomical mounts right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the FPL-53 glass in the Gran Turismo 81's triplet lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eFPL-53\u003c\/strong\u003e is a high-grade, extra-low dispersion (ED) glass that provides superior correction of chromatic aberration, or \"color fringing.\" This means light of all colors comes to the same sharp focus, resulting in higher contrast, truer star colors, and finer visible detail compared to standard doublet or ED glass designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics GT81 WIFD come with a field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, a field flattener is a required but \u003cstrong\u003eoptional accessory\u003c\/strong\u003e for astrophotography. While the telescope provides a sharp central image, a flattener is necessary to correct the natural field curvature of the optics and ensure pinpoint stars across the entire sensor of a DSLR or dedicated astronomy camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is \"WIFD\" and why is it better than a traditional focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eWIFD\u003c\/strong\u003e stands for William Optics Internal Focusing Design. Instead of an external drawtube that extends and retracts, the WIFD moves the objective lens internally. This creates a sealed, rigid system with zero image shift or tilt, providing a more stable and reliable platform for focusing, especially with the weight of an imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e81mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eApochromatic Triplet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass Type\u003c\/td\u003e\n\u003ctd\u003eFPL-53 Ohara Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Design\u003c\/td\u003e\n\u003ctd\u003eWIFD (William Optics Internal Focusing Design)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAvailable Colors\u003c\/td\u003e\n\u003ctd\u003eRed, Gold, Grey\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eGran Turismo 81 Main Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov Mask Lens Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM92 to M63 Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDual-Side Vixen\/Arca-Swiss Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Rings \u0026amp; Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAllen Key Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":44968075034909,"sku":"WO-T-GT-81RD-WIFD","price":3033.0,"currency_code":"CAD","in_stock":true},{"title":"Gold","offer_id":48966030000413,"sku":"WO-T-GT-81GD-WIFD","price":3033.0,"currency_code":"CAD","in_stock":true},{"title":"Grey","offer_id":48966030033181,"sku":"WO-T-GT-81SG-WIFD","price":3033.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-GT81-WIFD-1.jpg?v=1722276662"},{"product_id":"askar-v-60-80mm-modular-telescope","title":"Askar V 60\/80mm Modular Telescope","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e60mm Aperture Triplet Air-Spaced APO Objective\u003c\/li\u003e\n\u003cli\u003e360mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/6 Native Focal Ratio\u003c\/li\u003e\n\u003cli\u003eModular design supports optional 80mm objective lens\u003c\/li\u003e\n\u003cli\u003eStandard 55mm back focus from the M48 adapter\u003c\/li\u003e\n\u003cli\u003eGross weight of 2.8kg including tube rings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar V 60\/80mm Modular Telescope\u003c\/h2\u003e\n\u003cp\u003eThe Askar V 60\/80mm Modular Telescope is built around a single, adaptable optical tube that accepts two different objective lenses. The included 60mm f\/6 objective provides a 360mm focal length ideal for wide-field imaging, housed in a tube that measures just 318.5mm long and weighs 2.8kg with rings. This system's core is a triplet air-spaced APO objective with two ED glass elements, ensuring excellent color correction, and is designed for imagers with a standard 55mm back focus distance from its M48 adapter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOne 318.5mm OTA: Two Interchangeable Objectives\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of the Askar V is its modularity. The main 318.5mm tube assembly serves as the chassis for two interchangeable, high-quality objective lenses: the included 60mm and an optional 80mm. This allows you to reconfigure your telescope's aperture and focal length without needing a second, completely separate instrument, adapting your setup to best suit your target for the night.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 60mm f\/6 Triplet APO Platform\u003c\/h3\u003e\n\u003cp\u003eThe primary V60 objective is an air-spaced triplet apochromat with two ED glass elements, delivering sharp, high-contrast images with minimal chromatic aberration. At its native 360mm focal length and f\/6 focal ratio, this configuration is perfectly suited for capturing large swaths of the night sky, such as the expansive nebulosity of the Cygnus Loop or the dense star fields of the Milky Way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eOptional Correctors from 0.44kg: Reducer, Flattener, and Extender\u003c\/h3\u003e\n\u003cp\u003eTo further enhance its adaptability, the Askar V system includes three dedicated, optional accessories. A focal reducer (0.44kg) shortens exposure times, a flattener (0.48kg) ensures sharp stars across the entire image frame, and an extender (0.46kg) increases magnification for smaller targets. Each corrector is engineered to work with both the 60mm and 80mm objectives, featuring an adjustable mechanism to optimize optical spacing for either aperture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePrecision Mechanics and 55mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eDesigned for astrophotography, the Askar V incorporates the mechanical features needed for a rigid and precise imaging train. The rear of the telescope provides both M54x0.75 and M48x0.75 threaded connections, with the M48 adapter providing the industry-standard 55mm of back focus for easy connection of DSLRs, mirrorless, and dedicated astronomy cameras. The system also includes a precision rotator for framing, a multi-function handle, and both 2\" and 1.25\" visual adapters for observational use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Askar V's modular design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar V's primary advantage is its flexibility. Instead of buying two separate telescopes, you can use a single, high-quality chassis and swap between the 60mm objective for wide-field views and the optional 80mm objective for more resolution and light-gathering power on smaller targets. This saves space, weight, and cost while providing two distinct optical systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set up my camera with the Askar V for the correct 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar V provides a standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e distance measured from the base of the threads on its M48x0.75 adapter. Most dedicated astronomy cameras with a filter wheel, or a DSLR\/mirrorless camera with a standard M48 T-ring, are designed to meet this 55mm spacing automatically.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Askar V 60mm f\/6 configuration perform on the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 60mm aperture and 360mm focal length are an excellent match for very large targets like the North American Nebula (NGC 7000). Paired with a camera that has an APS-C or larger sensor, this configuration can frame the entire nebula complex in a single shot, making it an ideal wide-field imaging instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar V for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Askar V comes with both 2\" and 1.25\" adapters, allowing you to use standard diagonals and eyepieces for visual observation. Its high-quality APO optics make it a superb portable telescope for viewing star clusters, the Moon, and brighter nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the three optional accessories for the Askar V?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe three optional accessories adapt the telescope's optical characteristics for different imaging needs:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReducer:\u003c\/strong\u003e Increases the speed of the optical system (lower f-ratio), reducing exposure time and widening the field of view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlattener:\u003c\/strong\u003e Corrects for field curvature inherent in refractor designs, ensuring stars are sharp from the center to the corners of your image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtender:\u003c\/strong\u003e Increases the telescope's focal length, providing more magnification to capture finer details on smaller objects like galaxies or planetary nebulae.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar V a good choice for imaging the Andromeda Galaxy (M31) with the optional 80mm objective?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the optional 80mm objective would be an excellent choice for the Andromeda Galaxy (M31). When combined with the optional focal reducer, it would provide a wide enough field of view to capture the full extent of the galaxy's spiral arms on a full-frame or APS-C sensor, while the larger aperture would resolve more detail in its dust lanes compared to the 60mm objective.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e60mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e360mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Design\u003c\/td\u003e\n\u003ctd\u003eTriplet Air-Spaced APO (with 2 ED elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (OTA only)\u003c\/td\u003e\n\u003ctd\u003e318.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight (inc. rings\/plate)\u003c\/td\u003e\n\u003ctd\u003e2.8kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (from M48 adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Adapters\u003c\/td\u003e\n\u003ctd\u003eM54×0.75, M48×0.75 (with 2” filter thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVisual Adapters\u003c\/td\u003e\n\u003ctd\u003e2” and 1.25”\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Weight (Reducer)\u003c\/td\u003e\n\u003ctd\u003e0.44kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Weight (Flattener)\u003c\/td\u003e\n\u003ctd\u003e0.48kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Weight (Extender)\u003c\/td\u003e\n\u003ctd\u003e0.46kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44968091287837,"sku":"ASK-ASKARV80","price":2611.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Askar-V__51860.1682951859.1280.1280.jpg?v=1684348980"},{"product_id":"william-optics-redcat-61-petzval-wifd","title":"William Optics RedCat 61 WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e61mm Aperture Petzval-like Astrograph\u003c\/li\u003e\n\u003cli\u003eFast f\/4.9 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eWIFD (William Optics Internal Focus Design) Focuser\u003c\/li\u003e\n\u003cli\u003eRequires No Backfocus Calculation\u003c\/li\u003e\n\u003cli\u003eFull Frame Image Circle\u003c\/li\u003e\n\u003cli\u003eIntegrated Dual Vixen\/Arca-Swiss Mounting Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics RedCat 61 WIFD\u003c\/h2\u003e\n\u003cp\u003eThe William Optics RedCat 61 WIFD is a premium 61mm f\/4.9 Petzval-like astrograph engineered for wide-field imaging, delivering a flat, color-corrected field across a full-frame sensor without the need for complex backfocus calculations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 61mm f\/4.9 Petzval-like Optical System\u003c\/h3\u003e\n\u003cp\u003eThe heart of the RedCat 61 is its 61mm Petzval-like optical design, which produces a flat field of view without needing an additional flattener. At a fast focal ratio of f\/4.9, you can capture significant detail on faint nebulae and galaxies with shorter exposure times, reducing tracking demands on your mount. This integrated design ensures sharp, pinpoint stars from the center to the corners of your frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWilliam Optics WIFD: A Zero-Flexure Internal Focuser\u003c\/h3\u003e\n\u003cp\u003eThis RedCat model incorporates the William Optics Internal Focus Design (WIFD), a major upgrade for imagers. Unlike traditional focusers that move the camera and can introduce sag or tilt, the WIFD moves the optics internally. This mechanism provides exceptionally fine control and ensures the imaging train remains perfectly rigid and orthogonal to the focal plane, even when loaded with heavy cameras and filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eM48 Direct-Connect: Imaging Without Backfocus Spacing\u003c\/h3\u003e\n\u003cp\u003eOne of the most significant advantages of the RedCat 61 is its simplicity. The Petzval design eliminates the need to calculate and set a precise backfocus distance. You simply attach your DSLR, mirrorless, or dedicated astronomy camera to the included M48 adapter, focus, and start imaging. This removes a common point of failure and frustration from the astrophotography process, getting you to a successful result faster.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated Mounting: The 2-in-1 Vixen\/Arca Plate\u003c\/h3\u003e\n\u003cp\u003eThe RedCat 61 is built for the field. It features a CNC-machined tube ring connected to a dual-style mounting plate compatible with both Vixen-style saddles and Arca-Swiss tripod heads out of the box. An integrated handle bar makes transport easy and doubles as a mounting point for a guide scope. The entire package fits into a custom soft carry case, making it an ideal grab-and-go imaging instrument.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRedCat 61 vs. RedCat 51: 10mm More Aperture for Deeper Views\u003c\/h3\u003e\n\u003cp\u003eWhile both astrographs share the same f\/4.9 Petzval design and legendary ease of use, the RedCat 61 offers a distinct advantage in light-gathering power and image scale over its 51mm sibling.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedCat 51 Advantage:\u003c\/strong\u003e The RedCat 51 offers a wider true field of view, making it better suited for capturing immense targets like the entire North America Nebula (NGC 7000) or the full expanse of the Rho Ophiuchi cloud complex in a single frame.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedCat 61 Advantage:\u003c\/strong\u003e With a 61mm aperture, the RedCat 61 gathers nearly 44% more light, allowing for deeper images or shorter total integration times. Its longer focal length provides a tighter field of view, which is ideal for framing medium-sized targets like the Andromeda Galaxy (M31) or the Pleiades (M45) with more resolution and impact.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener for the William Optics RedCat 61 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The \u003cstrong\u003ePetzval-like optical design\u003c\/strong\u003e of the RedCat 61 provides a flat field natively, so no additional field flattener or reducer is required. This simplifies the imaging train and ensures optimal correction out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the RedCat 61's WIFD focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe William Optics Internal Focus Design (WIFD) moves the optical elements internally rather than moving the camera externally. This provides two key benefits:\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero Flexure:\u003c\/strong\u003e It prevents sag and tilt, which can occur with heavy cameras on traditional drawtube focusers, ensuring a perfectly flat focal plane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Camera Position:\u003c\/strong\u003e The camera does not move during focusing, which helps with cable management and maintaining balance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I mount the RedCat 61 to my equatorial mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe RedCat 61 includes an integrated \u003cstrong\u003edual-side mounting plate\u003c\/strong\u003e. This plate is directly compatible with standard \u003cstrong\u003eVixen-style\u003c\/strong\u003e saddles found on most equatorial mounts, as well as \u003cstrong\u003eArca-Swiss\u003c\/strong\u003e heads used on photographic tripods.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the RedCat 61 perform on the Andromeda Galaxy (M31) with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe RedCat 61 is an excellent choice for imaging the Andromeda Galaxy (M31) with a full-frame camera. Its focal length is ideal for framing the galaxy's core and sprawling spiral arms, while the flat field ensures that stars in the corners of the large sensor remain sharp and round.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the RedCat 61 a good choice for imaging the Pleiades (M45) from a portable setup?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's a perfect match. The Pleiades (M45) star cluster and its surrounding reflection nebulosity fit beautifully within the RedCat 61's field of view. Its compact size, f\/4.9 speed, and included soft carry case make it an ideal instrument for portable setups on a star tracker or small equatorial mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics RedCat 61 good for viewing planets like Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the RedCat 61 is not designed for high-magnification planetary viewing or imaging. As a fast f\/4.9 astrograph with a short focal length, it excels at capturing wide-field deep-sky objects. For planets, a telescope with a much longer focal length, like a Schmidt-Cassegrain or Maksutov-Cassegrain, is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e61mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003ePetzval-like Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eWIFD (William Optics Internal Focus Design)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003eFull Frame (44mm+)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 Male Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting Plate\u003c\/td\u003e\n\u003ctd\u003eDual Sided: Vixen-style and Arca-Swiss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRedCat 61 Main Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePatented Bahtinov Mask Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM48 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDual-side Vixen\/Arca Mounting Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Ring \u0026amp; Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAllen Key Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":45020060057885,"sku":"WO-T-C-61RD","price":1581.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-Redcat-61-1_da09ecb6-9960-4cc2-89cf-f05dc3c84480.jpg?v=1722275824"},{"product_id":"askar-103apo-f-6-8-triplet","title":"Askar 103APO f\/6.8 Triplet","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e103mm Aperture Triplet Air-Spaced APO Objective\u003c\/li\u003e\n\u003cli\u003e700.4mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/6.8 Native Focal Ratio\u003c\/li\u003e\n\u003cli\u003eIncludes One ED Glass Element for Superb Color Correction\u003c\/li\u003e\n\u003cli\u003eOTA Weight of 4.75kg\u003c\/li\u003e\n\u003cli\u003eGross Weight of 5.5kg with Rings and Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 103APO f\/6.8 Triplet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Askar 103APO combines a 103mm aperture with a 700.4mm focal length in a triplet air-spaced APO optical design. This f\/6.8 system delivers high-contrast images free of chromatic aberration, weighing 4.75kg as an OTA and extending from 600mm to 711mm with its dew shield. The complete package, including the 290mm Vixen dovetail plate and tube rings, has a gross weight of 5.5kg, providing a stable and adaptable imaging platform.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e103mm f\/6.8 Triplet APO Optics for Color-Free Imaging\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Askar 103APO is an air-spaced triplet objective lens that includes one element of ED (Extra-low Dispersion) glass. This apochromatic design virtually eliminates false color, ensuring that stars resolve to sharp, high-contrast points without distracting purple or blue halos. The 103mm aperture gathers significant light, allowing you to capture faint details in nebulae and resolve fine structures in galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Focused Build: Baffled Tube \u0026amp; Precision Focuser\u003c\/h3\u003e\n\u003cp\u003eEvery mechanical detail of the 103APO is engineered to maximize image contrast and user convenience. The interior of the main tube is knife-edge baffled and coated with matting paint, while the retractable dew shield is lined with felt to absorb stray light before it can reduce contrast. This ensures a dark background signal, critical for deep-sky astrophotography.\u003c\/p\u003e\n\u003cp\u003eThe instrument features a large, dual-speed rack-and-pinion focuser for precise adjustments, even with heavy camera loads. A 360° rotator with a high-precision scale allows you to perfectly frame your target without rotating your camera and upsetting your cable management. For added flexibility, finder bases are mounted on both sides of the focuser, providing ample room for a guide scope, finder, or other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDetachable Tube Design for Reducers and Binoviewers\u003c\/h3\u003e\n\u003cp\u003eA key feature of the Askar 103APO is its modular, detachable tube. The rear section of the optical tube can be unthreaded and removed, a design that enables two critical capabilities. First, it allows the telescope to reach focus with optional focal reducers, transforming the f\/6.8 system into a much faster wide-field instrument. Second, the shortened light path provides the necessary back-focus for use with binoviewers, offering immersive, three-dimensional visual experiences.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional 0.6x Reducer:\u003c\/strong\u003e Requires removing the rear tube section to achieve a significantly faster focal ratio for wide-field imaging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional 0.8x Reducer:\u003c\/strong\u003e Shortens the native f\/6.8 focal ratio for wider fields of view and reduced exposure times.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptional 1x Flattener:\u003c\/strong\u003e Corrects for field curvature without altering the 700.4mm focal length, ensuring sharp stars across the entire imaging sensor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e290mm Vixen Dovetail \u0026amp; Slotted Handle for Superior Balance\u003c\/h3\u003e\n\u003cp\u003eThe Askar 103APO comes equipped with a robust mounting system designed for stability and adaptability. The included 290mm Vixen-style dovetail plate is extra long, providing an extended range of adjustment to perfectly balance the telescope on your equatorial mount, regardless of the camera and accessory payload. The rigid handle not only provides a secure grip but also features a central slot, allowing you to adjust the spacing of the tube rings or mount additional accessories directly to the top of the OTA.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the Askar 103APO's triplet lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eAskar 103APO\u003c\/strong\u003e uses a three-element (triplet) apochromatic lens with one ED glass element. This design provides superior correction for chromatic aberration compared to standard doublet lenses. This means you will see pure star colors and sharp, high-contrast details on planets and deep-sky objects without distracting color fringing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 103APO's 700.4mm focal length frame a large target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt its native 700.4mm focal length, the Askar 103APO provides a medium-field view that is excellent for framing large galaxies like M31 or nebulae like the Lagoon Nebula (M8), especially with full-frame sensors. For an even wider perspective to capture the entire extent of such targets, you can use the optional 0.8x or 0.6x focal reducers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the detachable tube feature on the Askar 103APO work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe rear section of the main optical tube can be unthreaded and removed. This is required when using the optional 0.6x focal reducer, as it shortens the optical path to allow the system to achieve focus at a much faster focal ratio. This feature is a specific engineering solution to enable high-speed, wide-field imaging with the same OTA.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a binoviewer with the Askar 103APO for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The detachable tube design provides the extra back-focus required to bring a binoviewer to focus without needing a Barlow lens or optical corrector. This allows you to enjoy stunning, wide-field stereo views of the Moon, planets, and bright deep-sky objects at the telescope's native magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eUsing the Askar 103APO on a target like the Hercules Cluster (M13), what is the advantage of an optional focal reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the 700.4mm focal length is great for resolving individual stars in the core of the Hercules Cluster (M13), adding an optional reducer (like the 0.8x or 0.6x) offers two main advantages. It widens your field of view to better frame the cluster within its surrounding starfield, and it shortens your exposure times, allowing you to gather more signal in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWith a gross weight of 5.5kg, can the Askar 103APO be carried by a mid-range equatorial mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The 5.5kg gross weight (including rings and the 290mm dovetail plate) is well within the capacity of most mid-range equatorial mounts, such as those in the EQ6\/CEM40 class. The long dovetail plate makes it easy to achieve perfect balance even when adding a heavy camera, filter wheel, and guide scope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e103mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e700.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eTriplet Air-Spaced APO (1x ED Glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e4.75 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e5.5 kg (including rings and dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e600mm (dew shield retracted) \/ 711mm (dew shield extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003e2\" and 1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 103APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e290mm Vixen Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOxford Cloth Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eInstruction Manual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_103APO_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":46370262253853,"sku":"ASK-ASKAPO103","price":1679.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-103APO.png?v=1693160656"},{"product_id":"askar-140apo-f-7-triplet","title":"Askar 140APO f\/7 Triplet","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e140mm Aperture\u003c\/li\u003e\n\u003cli\u003e980mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/7 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eAir-Spaced Triplet APO with ED Glass\u003c\/li\u003e\n\u003cli\u003eOTA Weight: 9.2kg\u003c\/li\u003e\n\u003cli\u003e125mm Retractable Rear Tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 140APO f\/7 Triplet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Askar 140APO f\/7 Triplet refractor combines a 140mm aperture with a 980mm focal length for high-resolution planetary and deep-sky observation. Its air-spaced triplet objective, which includes one ED glass element, is housed in an OTA weighing just 9.2kg. The entire package, including tube rings and a 300mm Losmandy plate, comes to 10.9kg and contracts to a portable 735mm for transport.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e140mm f\/7 Triplet APO Optics: High-Contrast Imaging with ED Glass\u003c\/h3\u003e\n\u003cp\u003eThe optical system is built around a 140mm air-spaced triplet objective. By incorporating a low-dispersion ED glass element, the 140APO delivers images with sharp, high-contrast stars and virtually no false color, ensuring accurate color rendition from the brightest stars to the faintest nebulosity. The native 980mm focal length at f\/7 is a versatile starting point, striking a balance between wide-field views of large targets and the image scale needed to resolve detail on planets and smaller galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePortable Engineering: A 10.9kg Scope Measuring Just 735mm\u003c\/h3\u003e\n\u003cp\u003eDespite its large aperture, the Askar 140APO is engineered for field use. The optical tube assembly weighs only 9.2kg and measures 735mm in length with its dew shield retracted, making it manageable for transport and setup. When fully assembled with its included rings and 300mm dovetail plate, the total weight is 10.9kg. The retractable dew shield extends the total length to 870mm, providing excellent stray light and dew protection without compromising its compact storage profile.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging Mechanics: 125mm Retractable Tube for Focus Flexibility\u003c\/h3\u003e\n\u003cp\u003eA key feature of the 140APO is its 125mm retractable rear lens tube, designed to accommodate a wide range of accessories. When contracted, the shortened back focus allows binoviewers to reach focus without the need for a Barlow or optical corrector. When extended, it provides ample back focus for a full imaging train, including a reducer or flattener, off-axis guider, and camera. This mechanical flexibility is managed by a large, dual-speed rack-and-pinion focuser built to handle heavy loads without slipping, complemented by a 360-degree rotator for precise image framing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eStable Mounting System: 300mm Losmandy Plate and Integrated Handle\u003c\/h3\u003e\n\u003cp\u003eThe 140APO includes a robust mounting solution right out of the box. The 300mm Losmandy-style dovetail plate is longer than typical plates, providing a greater range of adjustment for balancing the telescope, especially with front- or rear-heavy accessory loads. The CNC-machined tube rings are secured by large, easy-to-use thumb screws, and the 220mm handle features an integrated slot, allowing it to double as a mounting base for a finder or guide scope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the Askar 140APO's 125mm retractable rear tube?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe retractable rear tube provides critical focus flexibility. \u003cstrong\u003eWhen contracted\u003c\/strong\u003e, it shortens the light path, allowing accessories with high in-focus requirements, like binoviewers, to be used without extra optical correctors. \u003cstrong\u003eWhen extended\u003c\/strong\u003e, it provides the necessary back focus distance for full astrophotography trains that include flatteners, reducers, filter wheels, and cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Askar 140APO be used for visual observing with a binoviewer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. Thanks to its retractable rear tube design, the Askar 140APO is fully compatible with most binoviewers. By retracting the 125mm tube, you can achieve focus without needing a Barlow lens or optical correcting system, which is a common requirement for refractors that lack this feature.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar 140APO perform on targets like the Orion Nebula (M42) with its optional 0.8x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the optional 0.8x reducer, the Askar 140APO transforms into a faster f\/5.6 system. This configuration is excellent for large targets like the Orion Nebula (M42), as it provides a wider field of view to capture the entire nebula complex and reduces exposure times by approximately 36%, allowing you to gather more signal in less time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar 140APO suitable for imaging Jupiter with a high-frame-rate camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The 140mm aperture provides excellent resolving power, and the 980mm native focal length gives you a good starting image scale for planets. For optimal results, you would add a 2x or 3x Barlow lens ahead of your planetary camera to increase the effective focal length and magnify details like Jupiter's Great Red Spot and cloud bands.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Askar 140APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eGiven the fully-loaded weight of 10.9kg and its length, the Askar 140APO requires a stable equatorial mount with a payload capacity of at least 40-45 lbs (approx. 20 kg) for astrophotography. Mounts in the Celestron CGX, Sky-Watcher EQ6-R Pro, or iOptron CEM40 class are suitable choices to ensure stability and precise tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat accessories are needed to start imaging with the Askar 140APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTo begin imaging, you will need a field flattener or reducer to ensure sharp stars across the entire frame. Askar offers a dedicated \u003cstrong\u003e1x flattener\u003c\/strong\u003e (maintains the f\/7 focal ratio) and a \u003cstrong\u003e0.8x reducer\/flattener\u003c\/strong\u003e (creates a faster f\/5.6 system). Beyond that, you will need a T-ring for your camera, a stable equatorial mount, and a guiding solution for long exposures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e140mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e980mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eTriplet air-spaced APO (with one ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRetractable Tube Travel\u003c\/td\u003e\n\u003ctd\u003e125mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e735mm (dew shield contracted) | 870mm (dew shield extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e9.2kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e10.9kg (including tube rings and dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003e2\" and 1.25\" visual adapters included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e140APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePair of Tube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 300mm Losmandy Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOxford Cloth Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_140APO_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47140030054685,"sku":"ASK-ASKAPO140","price":3499.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-140APO.jpg?v=1700148738"},{"product_id":"askar-185apo-f-7-triplet","title":"Askar 185APO f\/7 Triplet","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e185mm Aperture Triplet APO Objective\u003c\/li\u003e\n\u003cli\u003e1295mm Focal Length at f\/7\u003c\/li\u003e\n\u003cli\u003eIncludes one ED Glass Element for Color Correction\u003c\/li\u003e\n\u003cli\u003e95mm Retractable Rear Tube for Binoviewer and Imaging Focus\u003c\/li\u003e\n\u003cli\u003e17.2kg Gross Weight with Rings and 400mm Losmandy Plate\u003c\/li\u003e\n\u003cli\u003eSupports Full-Frame 44mm Image Circle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 185APO f\/7 Triplet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Askar 185APO delivers the light-gathering and resolving power of a 185mm objective in a remarkably manageable design. Its 1295mm focal length and native f\/7 ratio are corrected by an air-spaced triplet objective containing one ED glass element, ensuring high-contrast views free of false color. Despite its large aperture, the OTA collapses to just 1081mm for transport and weighs 14.9kg, a feat made possible by a 95mm retractable rear lens tube that provides critical focus travel for any accessory.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e185mm f\/7 Triplet APO Optics with ED Glass\u003c\/h3\u003e\n\u003cp\u003eThe optical system is built around a 185mm (7.28\") objective lens, giving it immense light-gathering power for resolving faint galaxies and pulling detail from planetary surfaces. The air-spaced triplet design, which incorporates a key ED (Extra-low Dispersion) glass element, provides apochromatic color correction, ensuring that stars are sharp, white pinpoints without distracting violet halos. At its native 1295mm focal length, the f\/7 ratio strikes a balance between high-magnification capability for small targets and a wide enough field for larger nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e95mm Retractable Tube for Portability and Binoviewers\u003c\/h3\u003e\n\u003cp\u003eA key innovation in the Askar 185APO is its 95mm retractable rear lens tube. This design allows the telescope's overall length to shrink to 1081mm, making it significantly easier to store and transport than fixed-tube refractors of this size. In use, this travel is critical for versatility: contract the tube to achieve focus with accessories that require significant in-travel, such as binoviewers, or extend it to accommodate imaging trains with correctors and cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e3.5-inch Rack \u0026amp; Pinion Focuser with 100mm of Travel\u003c\/h3\u003e\n\u003cp\u003eTo support heavy imaging payloads without flexure, the 185APO is equipped with a massive 3.5-inch dual-speed rack and pinion focuser. This unit features 100mm of precise focusing travel, marked with a high-contrast scale for repeatable settings. The entire assembly terminates in a 360° rotator with a large locking knob, allowing you to frame your target perfectly without rotating your camera and upsetting cable management. Dual finder bases provide flexible mounting options for guide scopes or other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e17.2kg Package with 400mm Losmandy Plate and Handle\u003c\/h3\u003e\n\u003cp\u003eThe Askar 185APO is engineered as a complete, field-ready system. The included tube rings are integrated into a single, rigid assembly, which connects to a 400mm Losmandy-style dovetail plate, ensuring compatibility with most high-capacity equatorial mounts. The total weight of 17.2kg requires a substantial mount, but the long dovetail provides ample room for achieving perfect balance. A matching 400mm handle runs along the top, offering a secure grip and additional mounting points for accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ef\/5.6 Imaging with Optional 0.8x Reducer\u003c\/h3\u003e\n\u003cp\u003eFor astrophotographers, the 185APO is a versatile platform capable of covering a full-frame 44mm image circle. While it performs beautifully at its native f\/7, an optional 0.8x reducer transforms it into a faster f\/5.6 astrograph. This shortened focal ratio captures wide-field targets like the North America Nebula (NGC 7000) more efficiently, significantly reducing required exposure times. For imaging at the native 1295mm focal length, a dedicated 1x flattener is also available to ensure pinpoint stars across the entire frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the Askar 185APO a good choice for both visual and imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 185APO's large \u003cstrong\u003e185mm aperture\u003c\/strong\u003e provides high resolution for visual observers, while its triplet APO optics deliver the color fidelity required for imaging. The key feature is the \u003cstrong\u003e95mm retractable rear tube\u003c\/strong\u003e, which allows the scope to reach focus with short-back-focus visual accessories like binoviewers and long imaging trains with equal ease.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 95mm retractable rear tube on the Askar 185APO work?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe rear section of the main optical tube can slide in and out by 95mm and is locked in place with a large, secure rudder-style ring. By contracting the tube, you gain the necessary in-travel to bring binoviewers to focus without a Barlow. By extending it, you provide the out-travel needed for imaging trains that include reducers, flatteners, and filter wheels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the Askar 185APO perform on the Andromeda Galaxy (M31) with the 0.8x reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith the optional \u003cstrong\u003e0.8x reducer\u003c\/strong\u003e, the focal ratio becomes a faster \u003cstrong\u003ef\/5.6\u003c\/strong\u003e. This wider field of view is ideal for capturing large targets like the Andromeda Galaxy (M31), allowing you to frame the entire galaxy and its companions on a full-frame sensor while benefiting from shorter exposure times.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a binoviewer with the Askar 185APO on a target like Jupiter?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e95mm retractable rear tube\u003c\/strong\u003e is specifically designed to accommodate the long optical path of a binoviewer. By fully contracting the tube, you can easily reach focus for high-power, immersive views of planets like Jupiter without needing an optical corrector assembly (OCA) or Barlow lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the Askar 185APO's 17.2kg weight?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a gross weight of \u003cstrong\u003e17.2kg (37.9 lbs)\u003c\/strong\u003e plus the weight of your camera and guide scope, you will need a high-payload equatorial mount. A mount rated for at least 50-60 lbs for imaging is recommended to ensure stability and precise tracking. The included \u003cstrong\u003e400mm Losmandy dovetail plate\u003c\/strong\u003e is compatible with most mounts in this class.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between the optional 1x flattener and the 0.8x reducer for the Askar 185APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e1x flattener\u003c\/strong\u003e corrects for field curvature without changing the telescope's native \u003cstrong\u003e1295mm focal length\u003c\/strong\u003e or \u003cstrong\u003ef\/7\u003c\/strong\u003e ratio, making it ideal for imaging smaller targets at high resolution. The \u003cstrong\u003e0.8x reducer\u003c\/strong\u003e also flattens the field but shortens the focal ratio to \u003cstrong\u003ef\/5.6\u003c\/strong\u003e, providing a wider field of view and cutting exposure times by about 36%, which is better for large nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e185mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1295mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eTriplet Air-Spaced APO with one ED Glass Element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e14.9 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e17.2 kg (including tube rings and dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Length\u003c\/td\u003e\n\u003ctd\u003e1081mm (dew shield contracted) | 1222mm (dew shield extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Retractable Tube Travel\u003c\/td\u003e\n\u003ctd\u003e95mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003e2\" and 1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e185APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 400mm Losmandy Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAluminum Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_185APO_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":47140051091741,"sku":"ASK-185APO","price":7391.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-185APO.jpg?v=1700148949"},{"product_id":"william-optics-redcat-51-wifd","title":"William Optics Redcat 51 WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCompact Apochromatic Refractor\u003c\/li\u003e\n\u003cli\u003ePetzval-like Optical Design for Flat Fields\u003c\/li\u003e\n\u003cli\u003eWilliam Optics Internal Focus Design (WIFD)\u003c\/li\u003e\n\u003cli\u003eCNC-Machined Aluminum Body\u003c\/li\u003e\n\u003cli\u003eIntegrated Mounting Ring, Handle, and Dual Vixen\/Arca-Swiss Plate\u003c\/li\u003e\n\u003cli\u003eDesigned for Hassle-Free Astrophotography\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Redcat 51 WIFD\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Redcat 51 WIFD combines a fast, wide-field optical system with a robust internal focuser, creating a portable imaging platform built for capturing expansive celestial targets. This Petzval-like apochromatic refractor simplifies astrophotography by delivering a sharp, flat field across your camera sensor without the need for complex back focus calculations, making the Redcat 51 a powerful tool for both beginners and seasoned imagers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRedcat 51: A Wide-Field Petzval-like Optical Design\u003c\/h3\u003e\n\u003cp\u003eThe heart of the Redcat 51 is its Petzval-like apochromatic optical system. This design uses an integrated flattener to produce pinpoint stars across a wide, corrected image circle, eliminating the need for a separate field flattener accessory. This makes it an ideal instrument for capturing large-scale celestial objects like the Andromeda Galaxy (M31) or the entire Veil Nebula complex in a single frame.\u003c\/p\u003e\n\u003cp\u003eBecause the optical correction is built-in, you can connect your camera directly using the included M48 adapter and start imaging immediately. This \"point-and-shoot\" simplicity removes one of the most common points of failure in an astrophotography setup—achieving correct sensor spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe WIFD Focuser: Precision Internal Focusing\u003c\/h3\u003e\n\u003cp\u003eThis version of the Redcat 51 features the William Optics Internal Focus Design (WIFD). Unlike traditional focusers that move the camera outward, the WIFD system adjusts focus by moving optical elements internally. This design offers two critical advantages for imaging: it eliminates image shift during focusing and prevents the camera from rotating, maintaining your target's framing perfectly.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero Image Shift:\u003c\/strong\u003e The internal mechanism provides a solid, stable platform for your camera, ensuring that focus adjustments are smooth and precise without tilting the imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Rotational Angle:\u003c\/strong\u003e Your camera and any attached accessories remain fixed in position, which is essential for maintaining guide star calibration and consistent mosaic framing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFine Control:\u003c\/strong\u003e The focuser allows for the minute adjustments necessary to achieve critical focus, enhancing the sharpness and detail in your final images.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCNC-Machined Build: The Redcat 51's Go-Anywhere Chassis\u003c\/h3\u003e\n\u003cp\u003eCrafted from a solid block of CNC-machined aluminum, the Redcat 51 WIFD is both rugged and highly portable. The entire assembly is engineered for travel and quick setup on lightweight star trackers or full equatorial mounts. The integrated mounting ring, handle bar, and dual-spec mounting plate provide a complete, ready-to-use system out of the box.\u003c\/p\u003e\n\u003cp\u003eThe dual Vixen and Arca-Swiss compatible mounting plate allows you to attach the telescope to virtually any astronomical mount or even a standard photographic tripod. This versatility makes the Redcat 51 an excellent choice for a grab-and-go deep-sky setup or a high-end telephoto lens for terrestrial photography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Redcat 51 WIFD's internal focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe main advantage of the William Optics Internal Focus Design (WIFD) is stability. By moving the optics internally, it prevents the camera and imaging train from moving or rotating. This eliminates image shift and maintains perfect framing, which is critical for sharp, automated astrophotography sequences.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener with the William Optics Redcat 51?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, you do not. The Redcat 51 uses a Petzval-like optical design that has a field flattener built into the optical tube. This provides a flat, corrected field out of the box, so you can attach your camera directly without worrying about additional accessories or back focus spacing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I mount the Redcat 51 WIFD to my tripod or mount?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Redcat 51 WIFD includes a dual-spec mounting plate. This plate is compatible with both standard \u003cstrong\u003eVixen-style\u003c\/strong\u003e saddles found on most astronomy mounts and \u003cstrong\u003eArca-Swiss\u003c\/strong\u003e clamps used on high-end photographic tripods, offering maximum mounting flexibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Redcat 51 a good telescope for viewing planets like Jupiter or Saturn?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can see planets with the Redcat 51, it is not its primary purpose. Its short focal length and wide field of view are optimized for deep-sky objects like nebulae and galaxies. For detailed planetary viewing, a telescope with a much longer focal length, such as a Schmidt-Cassegrain or Maksutov-Cassegrain, would be a better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Redcat 51 WIFD perform on large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Redcat 51 WIFD excels at imaging very large targets like the North American Nebula (NGC 7000) or the Andromeda Galaxy (M31). Its wide, flat field of view is designed specifically to capture these massive structures in their entirety, making it a premier instrument for wide-field mosaics and all-sky imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Redcat 51 WIFD suitable for a portable setup on a small star tracker?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. Its compact size, light weight, and robust, self-contained design make the Redcat 51 WIFD an ideal choice for pairing with a portable star tracker. This combination creates a powerful, airline-friendly deep-sky astrophotography rig that you can take to dark sky sites anywhere in the world.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRedcat 51 WIFD Main Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov Mask Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM48 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDual-side Vixen\/Arca-Swiss Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Ring \u0026amp; Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAllen Key Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":47333310202141,"sku":"WO-L-RC51RDIII","price":1225.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-Redcat-51-WIFD-1.jpg?v=1724263856"},{"product_id":"william-optics-redcat-71-wifd","title":"William Optics Redcat 71 WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eApochromatic Petzval-like Optical Design\u003c\/li\u003e\n\u003cli\u003eWIFD (William Optics Internal Focuser Design)\u003c\/li\u003e\n\u003cli\u003eIntegrated Bahtinov Mask in Dust Cap\u003c\/li\u003e\n\u003cli\u003eIncluded M48 Camera Adapter\u003c\/li\u003e\n\u003cli\u003eDual Vixen\/Arca-Swiss Mounting Plate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section-center\"\u003e\n      \u003ch2\u003eWilliam Optics Redcat 71 WIFD\u003c\/h2\u003e\n      \u003cp\u003eThe William Optics Redcat 71 WIFD is a premium apochromatic refractor designed for the discerning astrophotographer seeking a larger aperture in a portable, flat-field instrument. Its Petzval-like optical system corrects for field curvature across a wide imaging circle, delivering sharp, color-pure stars from edge to edge without the need for a separate field flattener. This design, combined with a fast focal ratio, illuminates faint, extended deep-sky objects like the North American Nebula (NGC 7000) with exceptional clarity and contrast.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eApochromatic Petzval-like Optics for Flat-Field Imaging\u003c\/h3\u003e\n      \u003cp\u003eThe core of the Redcat 71 is its four-element Petzval-like lens arrangement. This sophisticated optical design acts as its own flattener, a critical advantage for astrophotography. You can connect your DSLR or dedicated astronomy camera and achieve a flat, corrected field of view right out of the box, eliminating the complexity and potential spacing errors of using an external flattener.\u003c\/p\u003e\n      \u003cp\u003eAs an apochromatic refractor, the Redcat 71 uses specialized glass to bring all colors of the visual spectrum to a single, sharp focus. This prevents the distracting purple fringing around bright stars common in simpler designs, ensuring your star fields are rendered with natural, high-fidelity color.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n    \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eWIFD Internal Focuser for Zero Image Shift\u003c\/h3\u003e\n      \u003cp\u003eA key innovation in the Redcat 71 is the William Optics Internal Focuser Design (WIFD). Unlike traditional drawtube focusers that move the camera, the WIFD system moves the optical elements internally. This design completely eliminates image shift and focuser sag, even when using heavy imaging trains with filter wheels and off-axis guiders.\u003c\/p\u003e\n       \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMaximum Stability:\u003c\/strong\u003e Your camera and accessories remain fixed, maintaining perfect optical alignment throughout the focusing process for consistently sharp results.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003ePrecise Adjustments:\u003c\/strong\u003e The robust mechanism allows for smooth, meticulous focus control, which is essential for achieving critical sharpness on high-resolution sensors.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eIntegrated Bahtinov Mask:\u003c\/strong\u003e To aid in this process, the dust cap features an integrated Bahtinov mask, providing a simple and highly accurate method for reaching perfect focus every time.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eCNC-Machined Build and Integrated Mounting System\u003c\/h3\u003e\n      \u003cp\u003eCrafted from solid CNC-machined aluminum, the Redcat 71 WIFD is built for both durability and portability. The entire package is designed to be field-ready, with an integrated mounting system that provides immediate compatibility with a wide range of equatorial mounts and accessories. The included soft carry case makes it an ideal instrument for traveling to dark-sky sites.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDual Dovetail Plate:\u003c\/strong\u003e The mounting ring is attached to a versatile plate that features both a Vixen-style and Arca-Swiss rail, allowing you to connect to nearly any modern mount without extra hardware.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMulti-function Handlebar:\u003c\/strong\u003e The top handle not only makes the telescope easy to carry but also doubles as a mounting saddle for guide scopes or other accessories.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCamera Connection:\u003c\/strong\u003e The included M48 adapter provides a standard, wide-aperture connection point for most astronomy cameras and DSLR M48 T-rings.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eRedcat 71 vs. Redcat 51: More Aperture for Deeper Views\u003c\/h3\u003e\n      \u003cp\u003eThe Redcat 71 is the direct step-up from the legendary Redcat 51, designed for imagers who are ready for more resolving power and light-gathering capability.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eRedcat 51's Advantage:\u003c\/strong\u003e The smaller Redcat 51 remains the champion of ultimate portability, fitting in a camera bag and being perfectly suited for lightweight star trackers.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eRedcat 71's Advantage:\u003c\/strong\u003e The Redcat 71's larger aperture gathers significantly more light. This translates directly to brighter images, shorter exposure times, and the ability to resolve finer details in galactic dust lanes and faint nebulae. It represents a tangible increase in imaging power while maintaining the grab-and-go convenience the Redcat series is known for.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need a field flattener for the William Optics Redcat 71?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, you do not. The \u003cstrong\u003ePetzval-like optical design\u003c\/strong\u003e of the Redcat 71 has a built-in field flattener. This provides a flat, corrected field of view across a large image circle, ensuring sharp stars from corner to corner without requiring any additional accessories.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the WIFD focuser on the Redcat 71?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003eWIFD (William Optics Internal Focuser Design)\u003c\/strong\u003e is a major upgrade for astrophotography. By moving the optics internally instead of the camera, it offers two key benefits:\u003c\/p\u003e\n    \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eZero image shift or tilt:\u003c\/strong\u003e It prevents the camera from sagging or tilting, which is a common issue with heavy imaging setups on traditional focusers.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEnhanced stability:\u003c\/strong\u003e It creates a rigid, stable imaging train, which is critical for maintaining sharp focus over long exposures.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Redcat 71 WIFD perform on large targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Redcat 71 WIFD is an excellent choice for very large celestial objects. Its wide, flat field of view is ideal for framing the entirety of massive targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000), especially when paired with an APS-C or full-frame sensor.\u003c\/p\u003e\n  \u003c\/div\u003e\n    \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Redcat 71 WIFD visually on a portable mount?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes. While optimized for imaging, the Redcat 71's fast, high-contrast optics make it a superb rich-field telescope for visual use. Its compact size and the included soft case make it a great travel scope. It pairs well with sturdy portable mounts and star trackers, but you should always confirm your mount's payload capacity.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of dovetail plate does the Redcat 71 come with?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Redcat 71 includes a versatile \u003cstrong\u003edual-side dovetail plate\u003c\/strong\u003e. One side is a standard Vixen-style rail, and the other is an Arca-Swiss rail, providing native compatibility with a wide variety of astronomical mounts and photographic tripods without needing extra adapters.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve perfect focus with the Redcat 71 WIFD?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eThe Redcat 71 makes critical focusing simple. The lens cap has an \u003cstrong\u003eintegrated Bahtinov mask\u003c\/strong\u003e. Simply place the cap on the front of the telescope, point at a bright star, and adjust the WIFD focuser until the central diffraction spike is perfectly centered between the other two spikes.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eMain Tube\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eBahtinov Cap\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eM48 Camera Adapter\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eDual-side Plate\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eMounting Ring \u0026amp; Handle bar\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eAllen Key Set\u003c\/p\u003e\n        \u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":47333326749981,"sku":"WO-T-C-71RDII","price":2013.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Redcat-71-WIFD-perspective-1.webp?v=1722275887"},{"product_id":"sharpstar-50edph-f-5-5-triplet-apo","title":"SharpStar 50EDPH f\/5.5 Triplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e50mm Aperture Triplet APO Objective\u003c\/li\u003e\n\u003cli\u003e275mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/5.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003eIncludes Two ED Glass Elements\u003c\/li\u003e\n\u003cli\u003e1.07kg Total Weight\u003c\/li\u003e\n\u003cli\u003e196mm Retracted Length\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eSharpStar 50EDPH f\/5.5 Triplet APO\u003c\/h2\u003e\n\u003cp\u003eThe SharpStar 50EDPH f\/5.5 Triplet APO delivers exceptional color correction from a 50mm objective by using two extra-low dispersion (ED) glass elements in its air-spaced triplet design. With a native 275mm focal length, this ultra-portable refractor weighs just 1.07kg and measures a mere 196mm long, making it an ideal companion for travel, wide-field imaging, or as a high-end guide scope capable of reaching a limiting magnitude of 10.3.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eTriplet APO Optics: 50mm f\/5.5 with Two ED Elements\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 50EDPH is an air-spaced triplet objective, a design rarely seen in telescopes of this small 50mm aperture. Including two separate ED glass elements provides outstanding chromatic aberration control, ensuring stars are sharp, pinpoint sources of light without distracting purple fringing. The fast f\/5.5 focal ratio gathers light efficiently, making it well-suited for capturing faint, extended objects like the North American Nebula (NGC 7000).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUltra-Portable Build: A 1.07kg Grab-and-Go Design\u003c\/h3\u003e\n\u003cp\u003eEngineered for portability, the 50EDPH weighs only 1.07kg and has a contracted tube length of 196mm, compact enough to fit in a small camera bag. The scope features a 70mm Vixen-style dovetail plate with slotted 1\/4-20 threaded holes, allowing it to be mounted securely on astronomical mounts or standard photographic tripods. A retractable dew shield further enhances its compact form factor while protecting the objective from moisture and stray light.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 360° Rotator and 1.25\" Adapter\u003c\/h3\u003e\n\u003cp\u003eThe 50EDPH is built with the astrophotographer in mind. It includes a 360° rotator for precise camera framing and a dual-speed rack-and-pinion focuser for critical 1:10 fine adjustments. For visual observers, the rear includes a standard 1.25\" adapter for use with diagonals and eyepieces. The package also includes a 2-section 5cm M48 extension tube, enabling you to achieve focus with planetary cameras or for straight-through visual observation without a diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the SharpStar 50EDPH's optics special for its size?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eSharpStar 50EDPH\u003c\/strong\u003e uses a triplet air-spaced apochromatic (APO) objective that includes \u003cstrong\u003etwo ED glass elements\u003c\/strong\u003e. This is a highly advanced optical design for a 50mm telescope, providing superior color correction and sharper stars compared to standard doublet or single-ED refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I mount the SharpStar 50EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe telescope comes with a \u003cstrong\u003e70mm Vixen-style dovetail plate\u003c\/strong\u003e. This plate is compatible with most modern astronomical mounts. Additionally, it has 1\/4-20 threaded holes, allowing you to mount it directly to a standard photographic tripod for quick visual sessions or terrestrial viewing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the included M48 extension tubes for on the 50EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe two 5cm M48 extension tubes are included to provide the correct back focus for different setups. You can use them to reach focus when using a planetary camera or when performing straight-through visual observation with a 1.25\" eyepiece without a star diagonal in the optical path.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SharpStar 50EDPH for visual observation of the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, absolutely. The \u003cstrong\u003e275mm focal length\u003c\/strong\u003e provides a very wide field of view, perfect for framing large objects like the Orion Nebula (M42) in its entirety. Paired with a low-power 1.25\" eyepiece, you can easily fit the nebula and its surrounding star-forming regions into a single, immersive view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SharpStar 50EDPH suitable for imaging the Andromeda Galaxy (M31) with a DSLR?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 50EDPH is an excellent choice for imaging large targets like the Andromeda Galaxy (M31). Its 275mm focal length is a great match for framing the full extent of the galaxy on APS-C or even some full-frame sensors. The high-quality triplet optics will ensure the galaxy's core and dust lanes are captured with sharp, color-pure stars across the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the limitations of a 50mm aperture on the SharpStar 50EDPH?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile its optical quality is superb, a \u003cstrong\u003e50mm aperture\u003c\/strong\u003e primarily excels at wide-field views and portability. It has a limiting visual magnitude of 10.3, meaning it is not designed for high-magnification views of planets or resolving faint details in small, distant galaxies. Its strength lies in capturing large nebulae, star clusters, and vast sections of the Milky Way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e275mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eTriplet Air-Spaced APO (with two ED glass elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimiting Visual Magnitude\u003c\/td\u003e\n\u003ctd\u003e10.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length (Dew Shield Contracted)\u003c\/td\u003e\n\u003ctd\u003e196mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e1.07kg (including dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Interface\u003c\/td\u003e\n\u003ctd\u003e1.25\" Visual Adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e50EDPH OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e2-Section 5cm M48 Extension Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e70mm Vixen-Style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSharpStar\/Askar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SharpStar Optics","offers":[{"title":"Default Title","offer_id":47477227258141,"sku":"SSO-SHEDPH50","price":615.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SharpStar-50-EDPH.jpg?v=1705688038"},{"product_id":"askar-71f-quadruplet-flat-field-apo-f-6-9","title":"Askar 71F Quadruplet Flat-Field APO f\/6.9","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e71mm Aperture Quadruplet APO Optical Design\u003c\/li\u003e\n\u003cli\u003e490mm Focal Length at f\/6.9\u003c\/li\u003e\n\u003cli\u003e44mm Full-Frame Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eIntegrated Field Flattener\u003c\/li\u003e\n\u003cli\u003e3.0kg Total Weight with Rings and Dovetail\u003c\/li\u003e\n\u003cli\u003eDual-Speed 2.4-inch Rack \u0026amp; Pinion Focuser with 360° Rotator\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 71F Quadruplet Flat-Field APO f\/6.9\u003c\/h2\u003e\n\u003cp\u003eThe Askar 71F integrates a 71mm quadruplet apochromatic objective and a field flattener into a single optical system, delivering a 44mm image circle corrected for full-frame sensors. With a native 490mm focal length (f\/6.9) and a total weight of just 3.0kg including its tube rings, the 71F provides a portable, wide-field imaging solution that eliminates the complexity of calculating back focus for external correctors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eBuilt-in Flattener: A 44mm Full-Frame Corrected Image Circle\u003c\/h3\u003e\n\u003cp\u003eThe core of the Askar 71F is its quadruplet air-spaced APO objective, which includes an ED glass element to suppress chromatic aberration. Unlike conventional doublets or triplets, this design incorporates the flattener directly into the optical path. This provides a flat, corrected 44mm image circle without requiring you to purchase or calculate spacing for a separate corrector, ensuring sharp stars across a full-frame sensor right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 3.0kg Portability and a 360° Rotator\u003c\/h3\u003e\n\u003cp\u003eEngineered for field use, the Askar 71F weighs only 3.0kg fully equipped with its included rings and 230mm Vixen dovetail plate. The 2.4-inch dual-speed rack and pinion focuser provides 50mm of travel and is robust enough to handle modern cooled astronomy cameras without slipping. For precise composition, a 360° rotator is integrated at the rear, allowing you to frame your target perfectly without rotating your camera and cables.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRetractable Dew Shield:\u003c\/strong\u003e Reduces the telescope's transport length to as little as 372.5mm for increased portability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple Finder Mounts:\u003c\/strong\u003e A slot on the handle and two finder bases on the focuser provide flexible mounting options for guide scopes and other accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machined Tube:\u003c\/strong\u003e The entire optical tube is CNC machined for durability and features internal matting paint to eliminate stray light reflections.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVersatile Connectivity: M64, M54, and M48 Adapters Included\u003c\/h3\u003e\n\u003cp\u003eThe Askar 71F ships with a complete set of photographic adapters to connect your imaging equipment. The rear of the focuser terminates in an M64x0.75 thread, and the included adapters provide M54x0.75 and M48x0.75 outputs. The M48 adapter also includes threads for standard 2-inch filters, allowing you to easily integrate light pollution or narrowband filters into your imaging train without a separate filter wheel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar 71F vs. Traditional APOs: The Value of a Self-Flattened Design\u003c\/h3\u003e\n\u003cp\u003eWhile a standard doublet or triplet refractor may have a lower initial price, it requires a separate field flattener for astrophotography, which adds cost and complexity. The Askar 71F's integrated design offers a distinct advantage.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Back Focus Calculation:\u003c\/strong\u003e With a traditional flattener, you must achieve precise 55mm spacing, which can be complicated by filter wheels and off-axis guiders. The 71F is self-flattened; you simply bring the camera to focus.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost Efficiency:\u003c\/strong\u003e The price of a high-quality, full-frame flattener can be substantial. The 71F includes this correction as part of its native optical design, providing better value and a guaranteed level of optical correction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimplicity:\u003c\/strong\u003e By eliminating an extra component in the imaging train, the 71F reduces potential points of tilt, flexure, and connection error.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"self-flattened\" mean for my imaging with the Askar 71F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA \"self-flattened\" or \"flat-field\" design means the telescope's optics are inherently corrected to produce sharp, point-like stars across the entire image circle without needing an external corrector lens. With the Askar 71F, you do not need to buy a separate field flattener or worry about achieving a specific back focus distance (like 55mm). You just attach your camera with the included adapters and focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Askar 71F support a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Askar 71F is specifically designed with a \u003cstrong\u003e44mm image circle\u003c\/strong\u003e, which is large enough to fully illuminate the sensors on full-frame DSLR\/mirrorless cameras (e.g., Canon EOS Ra, Sony a7 series) and dedicated full-frame astronomy cameras (e.g., ZWO ASI6200MM\/MC Pro).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 71F frame large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith its 490mm focal length, the Askar 71F is ideal for large deep-sky objects. Paired with a full-frame sensor, it provides a field of view of approximately 4.2° x 2.8°, which can easily frame the entire North American Nebula (NGC 7000) and the neighboring Pelican Nebula (IC 5070) in a single shot.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is needed for the 3.0kg Askar 71F?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 71F's gross weight is only \u003cstrong\u003e3.0kg\u003c\/strong\u003e. This makes it an excellent match for portable star trackers and small equatorial mounts with a payload capacity of 5kg (11 lbs) or more, such as the Sky-Watcher Star Adventurer GTI or iOptron SkyGuider Pro, leaving ample capacity for a guide scope and camera.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Askar 71F for visual observation?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While optimized for imaging, the Askar 71F is also a high-contrast apochromatic refractor for visual use. You can attach a standard 1.25\" or 2\" diagonal to the focuser. Its 490mm focal length makes it a great wide-field instrument for observing large open clusters, the Andromeda Galaxy (M31), and sweeping the Milky Way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the included adapters for the Askar 71F used for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar 71F comes with a set of adapters to connect various cameras. The main outputs are:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM54×0.75:\u003c\/strong\u003e Common on larger ZWO and QHY cameras.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eM48×0.75:\u003c\/strong\u003e The standard for most astronomy cameras and correctors. This adapter also has internal threads for mounting 2-inch filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese allow you to directly connect most dedicated astronomy cameras and DSLRs (with an appropriate T-ring) to the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e71mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e490mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/6.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuadruplet air-spaced APO with one ED element\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2.4-inch Dual-Speed Rack \u0026amp; Pinion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Threads\u003c\/td\u003e\n\u003ctd\u003eM64×0.75, M54×0.75, M48×0.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight (OTA only)\u003c\/td\u003e\n\u003ctd\u003e2.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight (with rings \u0026amp; plate)\u003c\/td\u003e\n\u003ctd\u003e3.0kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (Visual, contracted)\u003c\/td\u003e\n\u003ctd\u003e372.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (Visual, extended)\u003c\/td\u003e\n\u003ctd\u003e430.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (Photo, contracted)\u003c\/td\u003e\n\u003ctd\u003e415mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (Photo, extended)\u003c\/td\u003e\n\u003ctd\u003e473.4mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 71F OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCarry Handle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVixen 230mm Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSet of Photographic Adapters\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_71F_Flat-Field_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":48093955359005,"sku":"ASK-ASAPO71F","price":923.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-71F-1.png?v=1712853195"},{"product_id":"william-optics-pleiades-68-astrograph-f-3-8-7-element-wifd","title":"William Optics Pleiades 68 Astrograph F\/3.8 7-Element WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e68mm Aperture 7-Element Astrograph\u003c\/li\u003e\n\u003cli\u003eFast f\/3.8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e260mm Focal Length\u003c\/li\u003e\n\u003cli\u003e48mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003eWeighs only 2.98 kg (6.57 lbs)\u003c\/li\u003e\n\u003cli\u003eWIFD Focuser with EAF Compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Pleiades 68 Astrograph F\/3.8 7-Element WIFD\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Pleiades 68 Astrograph combines a fast f\/3.8 optical system with a 68mm aperture to capture vast deep-sky targets in a single frame. Its 7-element design, incorporating three Super ED glass elements, delivers a flat, color-corrected 48mm image circle without requiring an external flattener. With a wide 260mm focal length and an OTA weight of just 2.98 kg, this astrograph is engineered for imagers seeking a portable, high-speed instrument that fully illuminates full-frame sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePleiades 68 Optics: A 7-Element, f\/3.8 Design with 3 Super ED Elements\u003c\/h3\u003e\n\u003cp\u003eThis astrograph is built around a sophisticated 7-element optical formula specifically for imaging. The f\/3.8 focal ratio dramatically reduces exposure times, allowing you to collect more data on faint nebulae and galaxies in a single night. Three Super ED glass elements are used to minimize chromatic aberration, ensuring star colors are rendered accurately and pinpoint sharp across the entire field.\u003c\/p\u003e\n\u003cp\u003eThe 260mm focal length provides an expansive field of view ideal for large targets like the Andromeda Galaxy (M31) or the Rho Ophiuchi cloud complex. Because the optical correction is integrated, you don't need to purchase or calculate spacing for a separate flattener, simplifying your imaging train and eliminating a potential source of tilt.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e48mm Image Circle and WIFD Focuser: Full-Frame Illumination and Stability\u003c\/h3\u003e\n\u003cp\u003eThe Pleiades 68 delivers a corrected and illuminated 48mm image circle, exceeding the requirements of full-frame (36x24mm) sensors and providing ample coverage for APS-C and M4\/3 cameras. This ensures your images are free from vignetting and maintain consistent star shapes from the center to the corners of the frame.\u003c\/p\u003e\n\u003cp\u003eFocusing is managed by the robust William Optics Internal Focuser Design (WIFD), a rack-and-pinion system that moves the optics internally. This design prevents sag and flexure common with heavy camera payloads, maintaining critical focus throughout an imaging session. The focuser is fully compatible with popular electronic auto-focusers (EAF) for automated, repeatable precision.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eField-Ready at 2.98 kg: Integrated Rotator, Tilt Adjuster, and Adapters\u003c\/h3\u003e\n\u003cp\u003eEngineered for portability and immediate use, the Pleiades 68 OTA weighs only 2.98 kg (6.57 lbs). The package includes a complete set of accessories to build a rigid imaging train right out of the box. An integrated camera angle rotator allows for precise framing, while the included tilt adjuster lets you dial in perfect sensor orthogonality.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile Mounting:\u003c\/strong\u003e The dual-side Vixen and Arca-Swiss dovetail plate provides native compatibility with a wide range of equatorial mounts and tripod heads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Adapters:\u003c\/strong\u003e M63 to M48 and M63 to M54 adapters are supplied, ensuring you can connect most dedicated astronomy cameras and DSLRs\/mirrorless cameras with the appropriate T-ring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e The astrograph ships in a soft carry case and includes a handle bar, mounting ring, riser blocks, and a Bahtinov mask cap for achieving perfect focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics Pleiades 68 need a separate field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The \u003cstrong\u003ePleiades 68\u003c\/strong\u003e is a 7-element astrograph with an integrated flattener in its optical design. It is engineered to produce a flat field across its entire \u003cstrong\u003e48mm image circle\u003c\/strong\u003e without any additional corrective optics.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a full-frame camera with the Pleiades 68 Astrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Pleiades 68 is designed for full-frame cameras. Its \u003cstrong\u003e48mm image circle\u003c\/strong\u003e provides full illumination for standard 36x24mm sensors, ensuring you can capture images without vignetting. The included M48 and M54 adapters accommodate common connections for full-frame astronomy cameras and DSLRs\/mirrorless bodies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 260mm focal length of the Pleiades 68 frame large targets like the North American Nebula (NGC 7000)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e260mm focal length\u003c\/strong\u003e, when paired with a full-frame sensor, provides a very wide field of view (approximately 7.8° x 5.2°). This is perfectly suited for framing enormous emission nebulae like the North American Nebula (NGC 7000) and the Veil Nebula complex in their entirety, with room to spare.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the WIFD focuser on the Pleiades 68?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe William Optics Internal Focuser Design (WIFD) moves the optical elements internally rather than moving the camera externally. This offers two main advantages:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Sag:\u003c\/strong\u003e It creates a more rigid imaging train that is less susceptible to flexure, especially with heavy cameras and filter wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Length:\u003c\/strong\u003e The overall length of the optical tube does not change during focusing, which can help with balance and clearance on some mounts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is also compatible with EAF systems for automated focusing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the included tilt adjuster for the Pleiades 68 do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe tilt adjuster allows you to make micro-adjustments to the angle of your camera sensor relative to the optical axis. This is crucial for achieving perfectly sharp stars across the entire frame, as it corrects for any slight tilt that may exist in your camera or focuser connection.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the 3.83 kg Pleiades 68?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a total weight of \u003cstrong\u003e3.83 kg (8.44 lbs)\u003c\/strong\u003e including rings and dovetail, the Pleiades 68 is very lightweight. It can be carried easily by portable star trackers and smaller equatorial mounts in the 20-25 lb payload class, such as a Sky-Watcher HEQ5 or iOptron CEM26, making it an excellent choice for a mobile imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Type\u003c\/td\u003e\n\u003ctd\u003e7-Element Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e3x Super ED Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e68 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e260 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/3.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e48 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Format Support\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eWIFD Rack \u0026amp; Pinion, EAF Compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e45 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Required\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT-Mount Support\u003c\/td\u003e\n\u003ctd\u003eCanon EF\/RF, Nikon F\/Z, Sony E, Pentax K, MFT, Fuji X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eVixen \/ Arca-Swiss Dual Type\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e366 mm - 410 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e2.98 kg (6.57 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e3.83 kg (8.44 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePleiades 68 Main Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov Mask Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Ring \u0026amp; Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDual-side Vixen\/Arca-Swiss Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCamera Angle Rotator\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTilt Adjuster\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM63 to M48 Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM63 to M54 Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRiser Blocks\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Set\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAllen Key Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48603138654493,"sku":"WO-T-P-68BU","price":3033.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Pleiades-68-perspective-1_a547ae6a-4742-4cbd-aba3-6ce858e67b9b.webp?v=1717690953"},{"product_id":"william-optics-pleiades-111-astrograph-f-4-8-7-element-wifd","title":"William Optics Pleiades 111 Astrograph F\/4.8 7-element WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e111mm Aperture 7-Element Astrograph\u003c\/li\u003e\n\u003cli\u003e528mm Focal Length at a fast f\/4.8\u003c\/li\u003e\n\u003cli\u003e45mm Image Circle for Full-Frame Sensors\u003c\/li\u003e\n\u003cli\u003eWilliam Optics Internal Focus Design (WIFD)\u003c\/li\u003e\n\u003cli\u003eIntegrated Rotator and Tilt Adjuster\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Pleiades 111 Astrograph F\/4.8 7-element WIFD\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Pleiades 111 Astrograph integrates a 7-element optical system into a 111mm aperture to deliver a perfectly flat 45mm image circle without an external flattener. Its fast f\/4.8 focal ratio at a 528mm focal length is engineered for serious astrophotographers, capturing expansive deep-sky targets with full-frame cameras. The entire optical train weighs 10.31 kg and features the William Optics Internal Focus Design (WIFD) for absolute stability with heavy imaging loads.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSeptuplet f\/4.8 Optics: A 45mm Flat-Field Imaging System\u003c\/h3\u003e\n\u003cp\u003eThe core of the Pleiades 111 is its 7-element apochromatic lens system, which incorporates three Super ED glass elements to achieve exceptional color correction. This sophisticated design produces a native 45mm image circle that is perfectly flat, eliminating the need for a separate flattener and simplifying your imaging train. At a fast f\/4.8, you can collect more light in less time, revealing faint nebulosity and detail in distant galaxies.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Flattener Required:\u003c\/strong\u003e The Petzval-like optical formula corrects for field curvature internally, ensuring sharp, pinpoint stars across a full-frame sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e111mm Aperture at 528mm:\u003c\/strong\u003e This combination provides a wide field of view, ideal for framing large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuper ED Glass:\u003c\/strong\u003e Three low-dispersion elements minimize chromatic aberration, resulting in high-contrast images with pure, vibrant star colors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWIFD Focuser: 35mm of Stable, Internal-Focus Travel\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics' innovative Internal Focus Design (WIFD) eliminates the primary source of flexure in traditional refractors: the moving drawtube. By moving the lens assembly internally over a 35mm travel range, the focuser body remains fixed and rigid. This design maintains perfect optical alignment and supports heavy camera packages without sagging, ensuring consistent focus and round stars throughout your imaging session.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero Image Shift:\u003c\/strong\u003e The internal rack-and-pinion mechanism provides smooth, precise focus adjustments without any lateral movement of the image.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAF Compatible:\u003c\/strong\u003e The WIFD focuser is fully compatible with popular electronic auto-focusers, enabling automated and repeatable focusing routines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRigid and Compact:\u003c\/strong\u003e With no external drawtube, the telescope maintains a more compact and stable profile as it slews across the sky.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eIntegrated Rotator and Tilt Adjuster: Precision Camera Framing\u003c\/h3\u003e\n\u003cp\u003eThe Pleiades 111 is built for precision from the focuser to the sensor. An integrated camera angle rotator allows you to frame your target perfectly without loosening any connections in your imaging train. To achieve flawless corner-to-corner sharpness, a built-in tilt adjuster lets you dial in the orthogonality of your camera sensor to the optical axis, correcting for any minor tilt in your setup.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e360° Camera Rotation:\u003c\/strong\u003e Easily compose your images by rotating the entire camera and filter wheel assembly with a smooth, lockable mechanism.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Adapters:\u003c\/strong\u003e The astrograph ships with both M48 and M54 camera adapters, providing direct, threaded connections for most modern astronomy cameras and DSLRs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLosmandy-Style Dovetail:\u003c\/strong\u003e A robust Losmandy-D dovetail plate provides a secure connection to your equatorial mount, capable of handling the 10.31 kg total weight.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need to buy a separate flattener for the Pleiades 111 Astrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The William Optics Pleiades 111 has a 7-element optical design that corrects for field curvature internally. It produces a native \u003cstrong\u003e45mm flat image circle\u003c\/strong\u003e without requiring any additional flattener or reducer, simplifying your imaging train.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat are the advantages of the WIFD internal focuser on the Pleiades 111?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe William Optics Internal Focus Design (WIFD) moves the lens assembly internally rather than using an external drawtube. This offers two key advantages:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Rigidity:\u003c\/strong\u003e It prevents focuser sag, which is critical when using heavy cameras, filter wheels, and off-axis guiders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistent Collimation:\u003c\/strong\u003e By keeping the camera and accessories fixed, it maintains perfect optical alignment as you focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Pleiades 111's 528mm focal length frame large targets like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e528mm focal length\u003c\/strong\u003e paired with a full-frame sensor provides a wide field of view, approximately 3.9° x 2.6°. This is perfectly suited for capturing the entire Andromeda Galaxy (M31), including its faint outer arms and satellite galaxies M32 and M110, in a single frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the f\/4.8 focal ratio of the Pleiades 111 good for narrowband imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the fast \u003cstrong\u003ef\/4.8 focal ratio\u003c\/strong\u003e is a significant advantage for narrowband imaging. It allows you to gather signal on faint emission nebulae, like the Cygnus Loop or the Heart Nebula (IC 1805), much faster than with slower f\/6 or f\/7 systems, reducing your total exposure time for each filter.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is required for the William Optics Pleiades 111?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Pleiades 111 has a total weight of \u003cstrong\u003e10.31 kg (22.73 lbs)\u003c\/strong\u003e when fully assembled with rings and dovetail. For stable astrophotography, you should use a German Equatorial Mount with a payload capacity of at least 40 lbs (18 kg) to ensure precise tracking and guiding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do the included tilt and rotator adapters on the Pleiades 111 do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThese are critical tools for advanced imaging. The \u003cstrong\u003erotator\u003c\/strong\u003e allows you to change the orientation of your camera to perfectly frame your target without changing focus. The \u003cstrong\u003etilt adjuster\u003c\/strong\u003e lets you make micro-adjustments to the angle of your camera sensor to ensure it is perfectly perpendicular to the light path, guaranteeing sharp stars across the entire field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e7-Element Astrograph with 3x Super ED Glass Elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e111 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e528 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e45 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eWIFD Rack \u0026amp; Pinion Internal Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Required\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Support\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Camera Adapters\u003c\/td\u003e\n\u003ctd\u003eM48, M54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eLosmandy-D Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length (Retracted\/Extended)\u003c\/td\u003e\n\u003ctd\u003e645 mm - 785 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e7.95 kg \/ 17.53 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight (inc. rings\/dovetail)\u003c\/td\u003e\n\u003ctd\u003e10.31 kg \/ 22.73 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTilt Adjuster\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCamera Angle Rotator\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM48 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48603506409757,"sku":"WO-T-P-111BU","price":5793.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Pleiades-111-pers-2.webp?v=1717694571"},{"product_id":"william-optics-pleiades-181-astrograph-f-5-5-7-element-wifd","title":"William Optics Pleiades 181 Astrograph F\/5.5 7-element with 3 ED glasses","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e181mm Aperture, 998mm Focal Length\u003c\/li\u003e\n\u003cli\u003eFast f\/5.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e7-Element Optical Design with 3 Super ED Glass Elements\u003c\/li\u003e\n\u003cli\u003e55mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003e4.1-inch Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eIntegrated Petzval design requires no additional flattener\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Pleiades 181 Astrograph f\/5.5\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Pleiades 181 is a dedicated imaging instrument built around a 7-element optical design that delivers a massive 55mm corrected image circle. Its 181mm objective and fast f\/5.5 focal ratio are corrected by three Super ED glass elements, providing a flat, color-pure field across medium format sensors without requiring an external flattener. With a robust 4.1-inch Rack \u0026amp; Pinion focuser and a total weight of 18.7 kg, this astrograph is engineered from the ground up for serious, large-format astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 7-Element, 181mm Optical System for Flat-Field Imaging\u003c\/h3\u003e\n\u003cp\u003eThe Pleiades 181 combines a large 181mm aperture with a 998mm focal length, resulting in a fast f\/5.5 system ideal for capturing faint detail in nebulae and galaxies. The optical core is a 7-element Petzval-like design that includes three Super ED glass elements to virtually eliminate chromatic aberration, ensuring stars remain tight, color-neutral points of light.\u003c\/p\u003e\n\u003cp\u003eBecause the field-correcting elements are integrated into the main optical train, the Pleiades 181 produces a natively flat field. This eliminates the need to purchase and correctly space a separate flattener, simplifying your imaging train and guaranteeing optimal correction right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Image Circle for Medium Format Sensors\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for large-format imaging, the Pleiades 181 illuminates a corrected 55mm image circle. This provides complete, unvignetted coverage for medium format sensors and easily accommodates full-frame, APS-C, and M4\/3 cameras with room to spare.\u003c\/p\u003e\n\u003cp\u003eThe expansive corrected field allows you to frame the largest deep-sky objects without compromise and gives you significant flexibility in composing your shots. For imagers using full-frame or smaller sensors, the edge-to-edge correction ensures perfectly round stars across the entire frame, even on the most demanding, high-resolution cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eEngineered for Imaging: 4.1-inch Focuser and Integrated Adapters\u003c\/h3\u003e\n\u003cp\u003eTo handle the weight of modern imaging packages, the Pleiades 181 is equipped with a heavy-duty 4.1-inch Rack \u0026amp; Pinion focuser. With 43mm of precise focus travel and native compatibility with popular electronic auto-focusers (EAF), it provides a rigid, repeatable platform for achieving critical focus, even with heavy cameras and filter wheels.\u003c\/p\u003e\n\u003cp\u003eThe astrograph includes a complete set of adapters to streamline camera connection. The package contains M68, M54, and M48 adapters, along with a built-in rotator for framing and a tilt adjuster for perfecting sensor alignment. This comprehensive solution ensures you can connect and optimize your imaging train immediately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eRobust Mechanical Design: 18.7 kg Total Weight and Ergonomic Handling\u003c\/h3\u003e\n\u003cp\u003eThe Pleiades 181 is a substantial instrument, with an optical tube assembly weight of 15 kg (33.07 lbs) and a total equipped weight of 18.7 kg (41.23 lbs). This requires a high-capacity equatorial mount to ensure stability and tracking accuracy. The telescope comes with a standard Losmandy-style dovetail plate for secure mounting.\u003c\/p\u003e\n\u003cp\u003eTo aid in handling and setup, the design incorporates William Optics' signature features, including the innovative Cosmos Steering Wheel for easier lifting and positioning. The tube extends from a retracted length of 1231mm to 1496mm with the dew shield in place, providing excellent stray light and moisture protection for the objective lens.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat class of mount is required for the Pleiades 181 astrograph?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a total weight of \u003cstrong\u003e18.7 kg (41.23 lbs)\u003c\/strong\u003e, the Pleiades 181 requires a high-payload equatorial mount. For reliable imaging, a mount with a rated instrument capacity of at least 60-70 lbs (27-32 kg) is strongly recommended to ensure stability and precise tracking with a full camera and guide scope setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics Pleiades 181 require a separate field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The Pleiades 181 uses an integrated \u003cstrong\u003e7-element Petzval-type design\u003c\/strong\u003e where the correcting lenses are part of the main optical assembly. It produces a natively flat \u003cstrong\u003e55mm image circle\u003c\/strong\u003e without the need for any additional flattener or reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera to the Pleiades 181 focuser?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Pleiades 181 includes a comprehensive adapter system to connect most modern astronomy cameras. The package comes with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eM68, M54, and M48 Camera Adapters:\u003c\/strong\u003e These three common thread sizes cover the majority of dedicated astronomy cameras and filter wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCamera Rotator:\u003c\/strong\u003e Allows for easy framing of your target without loosening the camera.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTilt Adjuster:\u003c\/strong\u003e Enables fine-tuning of the sensor plane to achieve perfect corner-to-corner focus.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the Pleiades 181's 55mm image circle for a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA full-frame sensor has a diagonal of approximately 43mm. The Pleiades 181's oversized \u003cstrong\u003e55mm image circle\u003c\/strong\u003e ensures that the entire sensor is not just illuminated, but fully corrected. This provides excellent star shapes and even brightness from the center to the extreme corners of a full-frame image, preventing vignetting and optical distortions that can appear at the edge of a smaller image circle.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Pleiades 181 be used for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the Pleiades 181 is optically optimized as an astrograph for imaging, it can be used visually. However, its integrated correcting lenses and focuser design may make it difficult to reach focus with some standard eyepieces and diagonals. Its primary strength and intended application is deep-sky astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Pleiades 181's f\/5.5 focal ratio impact imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe fast \u003cstrong\u003ef\/5.5 focal ratio\u003c\/strong\u003e allows you to collect a significant amount of light in a shorter period compared to slower f\/8 or f\/10 systems. When imaging a large target like the Andromeda Galaxy (M31), this means you can capture the faint outer spiral arms and dust lanes with shorter individual sub-exposures, improving your signal-to-noise ratio and reducing the demands on your mount's tracking.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Type\u003c\/td\u003e\n\u003ctd\u003e7-Element Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e3x Super ED Glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e181 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e998 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e55 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e4.1” Rack \u0026amp; Pinion Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e43 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEAF Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Required\u003c\/td\u003e\n\u003ctd\u003eNo, integrated design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Camera Formats\u003c\/td\u003e\n\u003ctd\u003eMedium Format, Full Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT-Mount Support\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF; Nikon F, Z; Sony E; Pentax K; MFT (M4\/3); FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eLosmandy Style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length (Retracted\/Extended)\u003c\/td\u003e\n\u003ctd\u003e1231 mm \/ 1496 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e15 kg \/ 33.07 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight (w\/ rings \u0026amp; dovetail)\u003c\/td\u003e\n\u003ctd\u003e18.7 kg \/ 41.23 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003ePleiades 181 Optical Tube Assembly\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTilt Adjuster\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCamera Angle Rotator\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM68 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM54 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM48 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":48603569291549,"sku":"WO-T-P-181RD","price":27597.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/FLT-180-pers-2.webp?v=1717695854"},{"product_id":"askar-sqa55-55mm-f-4-8-quintuplet-apo","title":"Askar SQA55 55mm f\/4.8 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e55mm Aperture Quintuplet APO Astrograph\u003c\/li\u003e\n\u003cli\u003eFast f\/4.8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e264mm Focal Length\u003c\/li\u003e\n\u003cli\u003eCovers a 44mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003e14-Blade Aperture with f\/4.8-f\/22 Range\u003c\/li\u003e\n\u003cli\u003eTotal Weight of only 2.18kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar SQA55 55mm f\/4.8 Quintuplet APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar SQA55 combines a 55mm quintuplet APO optical design with a fast f\/4.8 focal ratio to illuminate a full-frame 44mm image circle without requiring a separate flattener. Its 264mm focal length is ideal for capturing vast nebulae and galactic structures, while the total instrument weight of just 2.18kg makes it an exceptionally portable imaging solution for travel and lightweight mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eFull-Frame f\/4.8 Petzval Optics: A 44mm Flat Field\u003c\/h3\u003e\n\u003cp\u003eThe SQA55 is built around a five-element Petzval optical design that corrects for field curvature internally, delivering a flat 44mm image circle sharp to the corners of a full-frame sensor. This integrated design, which includes one ED (Extra-low Dispersion) and one SD (Super ED) glass element, eliminates the need to purchase, space, and configure a separate field flattener, simplifying your imaging train.\u003c\/p\u003e\n\u003cp\u003eThe fast f\/4.8 focal ratio allows you to gather significant signal in shorter exposure times, a critical advantage for mobile imaging setups. At a 264mm focal length, the SQA55 provides a sweeping field of view perfect for framing large targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eDual-Purpose Design: 14 Blades from f\/4.8 to f\/22\u003c\/h3\u003e\n\u003cp\u003eUnlike most dedicated astrographs, the Askar SQA55 incorporates features for high-end terrestrial and wildlife photography. The manual aperture ring adjusts a 14-blade diaphragm, allowing you to stop the lens down from a wide-open f\/4.8 all the way to f\/22. This gives you precise control over depth of field for daytime subjects.\u003c\/p\u003e\n\u003cp\u003eThe 14-blade aperture produces exceptionally smooth, circular out-of-focus highlights (bokeh), adding an artistic quality to terrestrial images that fixed-aperture telescopes cannot achieve. Combined with a close focus distance of just 5m, the SQA55 becomes a versatile telephoto lens for both celestial and earthly subjects. Note that focusing is entirely manual, a trade-off for its robust optical performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eCompact at 2.18kg: Built for Portability and Easy Integration\u003c\/h3\u003e\n\u003cp\u003eEngineered for imagers on the move, the SQA55 weighs only 1.84kg for the optical tube alone and 2.18kg with its handle and dovetail plate attached. Its compact length of 244mm (with the dew shield retracted) allows it to fit easily into carry-on luggage or a backpack, and it rides comfortably on even the most portable star trackers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Connections:\u003c\/strong\u003e The rear of the scope terminates in M48x0.75 male threads, the standard for connecting most astronomy cameras and DSLR\/mirrorless T-rings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e55mm Back Focus:\u003c\/strong\u003e The optical design is optimized for the industry-standard 55mm back focus distance, ensuring you can connect your camera via a standard T-ring and achieve perfect spacing without complex calculations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Threads:\u003c\/strong\u003e The objective lens assembly includes M67 filter threads for attaching standard photographic filters, while the M48 rear adapter is also threaded for 2\" astronomy filters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar SQA55: Integrated Flat-Field vs. 2-Piece Optical Systems\u003c\/h3\u003e\n\u003cp\u003eChoosing an astrograph often means pairing a primary telescope with a separate, matched flattener or reducer. The SQA55's quintuplet Petzval design offers a compelling alternative by integrating the field-flattening elements directly into the main optics.\u003c\/p\u003e\n\u003cp\u003eThis approach provides a significant advantage in simplicity and reliability. There are no additional accessories to buy, no potential for tilt introduced by extra threaded connections, and no complex back focus calculations to perform. The SQA55 is a complete, flat-field imaging system right out of its included military-grade waterproof case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of astrophotography is the Askar SQA55 best for with its 264mm focal length?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eAskar SQA55\u003c\/strong\u003e is ideal for wide-field astrophotography. Its 264mm focal length is perfect for capturing large celestial objects, such as the entire Andromeda Galaxy (M31), the North American Nebula (NGC 7000), the Veil Nebula complex, or vast star fields in the Milky Way.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect a full-frame DSLR to the Askar SQA55?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou will need a standard M48 T-ring specific to your camera's mount (e.g., Canon EOS, Nikon F, Sony E). The \u003cstrong\u003eAskar SQA55\u003c\/strong\u003e is designed with the standard \u003cstrong\u003e55mm back focus\u003c\/strong\u003e distance, which is precisely what a DSLR with a T-ring requires. Simply thread the T-ring onto the SQA55's M48 rear adapter, attach your camera, and you are ready to image.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the Askar SQA55 be used for visual astronomy?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the \u003cstrong\u003eAskar SQA55\u003c\/strong\u003e is optically optimized as an imaging astrograph, it can be used for visual observation. You would need to add a 1.25\" or 2\" diagonal and an eyepiece. However, its primary strength is delivering a perfectly flat field for full-frame cameras, a feature that is less critical for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat makes the SQA55's 14-blade aperture useful for daytime photography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e14-blade aperture\u003c\/strong\u003e provides two key benefits for terrestrial photography. First, it creates beautifully smooth, circular out-of-focus highlights (bokeh). Second, it allows you to stop down the aperture from f\/4.8 to f\/22, giving you control over depth of field, which is essential for landscape and wildlife photography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Askar SQA55 work well on a portable star tracker like a Sky-Watcher Star Adventurer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. With a total weight of only \u003cstrong\u003e2.18kg\u003c\/strong\u003e (including handle and dovetail), the \u003cstrong\u003eAskar SQA55\u003c\/strong\u003e is well under the payload capacity of most portable star trackers. This makes it an excellent choice for a lightweight, travel-friendly deep-sky imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the SQA55's Petzval design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage of the \u003cstrong\u003eAskar SQA55's\u003c\/strong\u003e Petzval design is its built-in field flatness. Unlike a traditional doublet or triplet refractor that requires a separate, carefully spaced field flattener, the SQA55 corrects for field curvature internally. This simplifies your imaging train, reduces potential tilt, and ensures you get sharp stars across a \u003cstrong\u003e44mm full-frame sensor\u003c\/strong\u003e out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e55mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e264mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuintuplet Petzval APO (1x ED Glass, 1x SD Glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e44mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture Control\u003c\/td\u003e\n\u003ctd\u003e14 Blades, Adjustable f\/4.8 to f\/22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosest Focus Distance\u003c\/td\u003e\n\u003ctd\u003e5m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocusing Mode\u003c\/td\u003e\n\u003ctd\u003eManual Focus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront Filter Thread\u003c\/td\u003e\n\u003ctd\u003eM67\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e316mm (dew shield extended), 244mm (dew shield retracted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (OTA)\u003c\/td\u003e\n\u003ctd\u003e1.84kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (Total)\u003c\/td\u003e\n\u003ctd\u003e2.18kg (including handle \u0026amp; dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapter\u003c\/td\u003e\n\u003ctd\u003eM48x0.75 (with M48x0.75 filter thread)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e55mm (supports 50-60mm range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar SQA55 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMilitary-Grade Waterproof Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_SQA55_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":48840234533149,"sku":"ASK-ASKSQA55","price":1113.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-SQA55-1.jpg?v=1721238713"},{"product_id":"svbony-sv503-ed-80mm-f7-doublet","title":"SVBONY SV503 ED 80mm F7 Doublet","description":"\u003c!-- more --\u003e\n\u003cp\u003e1.Rugged housing prevents damage;\u003c\/p\u003e\n\u003cp\u003e2.Sliding graceful and soft dual-speed focuser;\u003c\/p\u003e\n\u003cp\u003e3.Ed glass (S-FPL51) can produce very beautiful and clear images;\u003c\/p\u003e\n\u003cp\u003e4.The fully multilayer coated lens eliminates all reflections on the glass, and it has little or no chromatic aberration at high magnification.\u003c\/p\u003e\n\u003ctable cellspacing=\"0\" cellpadding=\"0\" border=\"0\"\u003e\n\u003ccolgroup\u003e\n\u003ccol\u003e\n\u003ccol\u003e\n\u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eSV503\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens Diameter \u003c\/td\u003e\n\u003ctd\u003e80mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Piece Lens Description\u003c\/td\u003e\n\u003ctd\u003eED\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e560 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003eF7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coated\u003c\/td\u003e\n\u003ctd\u003eUltra-wideband Coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens Type\u003c\/td\u003e\n\u003ctd\u003eDouble Separation Lens Structure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLimit Magnitude\u003c\/td\u003e\n\u003ctd\u003e11.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSet The Light Force\u003c\/td\u003e\n\u003ctd\u003e130.6x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e1.5 Arcseconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3950g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Tube Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e103mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2 inch Dual Speed Focuser; The Gear Ratio 110\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Type\u003c\/td\u003e\n\u003ctd\u003eRack Pinion Design\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackages\u003c\/td\u003e\n\u003ctd\u003e1x SV503 White 80ED F7 Telescope OTA (for observing and for astrophotography)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Dimensions\u003c\/td\u003e\n\u003ctd\u003e540mm*215mm*230mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":49024062980381,"sku":"SV-F9359B","price":580.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/image_06400c35-1e84-4d73-aa31-c62bfdd3378b.jpg?v=1723303339"},{"product_id":"william-optics-minicat-51-wifd","title":"William Optics MiniCat 51 WIFD f\/3.5","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e51mm Aperture Diameter\u003c\/li\u003e\n\u003cli\u003e178mm Focal Length\u003c\/li\u003e\n\u003cli\u003ef\/3.5 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e6-Element Petzval Optical Design\u003c\/li\u003e\n\u003cli\u003e43.2mm Full-Frame Image Circle\u003c\/li\u003e\n\u003cli\u003eWIFD Rack \u0026amp; Pinion Focuser\u003c\/li\u003e\n\u003cli\u003e1.67 kg OTA Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics MiniCat 51 WIFD f\/3.5 Astrograph\u003c\/h2\u003e\n\u003cp\u003eThe William Optics MiniCat 51 WIFD combines an extremely fast f\/3.5 focal ratio with a 178mm focal length in a 6-element Petzval design engineered for wide-field astrophotography. Its optical train, featuring two Super ED glass elements, produces a flat 43.2mm image circle that fully illuminates full-frame sensors without requiring an additional flattener. Weighing just 1.67 kg, the MiniCat 51 delivers a portable, high-speed imaging platform ready for any location.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e6-Element f\/3.5 Petzval Optics: A 43.2mm Flat Field\u003c\/h3\u003e\n\u003cp\u003eThe MiniCat 51's optical system is built for one purpose: capturing immense swaths of the night sky with exceptional color correction and sharpness. The 6-element Petzval layout corrects for field curvature internally, meaning you get pinpoint stars across a 43.2mm image circle without the complexity of a separate flattener. Two Super ED elements minimize chromatic aberration, ensuring clean, high-contrast images of targets like the North American Nebula (NGC 7000) or the Andromeda Galaxy (M31).\u003c\/p\u003e\n\u003cp\u003eAt an aggressive f\/3.5 focal ratio, this astrograph gathers light significantly faster than typical f\/5 or f\/6 refractors. This allows you to collect more signal in less time, reducing the demands on your mount's tracking and enabling deeper images from a single night's session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003ePatented WIFD Focuser: 28mm of Tilt-Free Travel\u003c\/h3\u003e\n\u003cp\u003eWilliam Optics' patented Internal Focus Design (WIFD) is a robust rack-and-pinion mechanism built to handle modern imaging payloads without flexure or tilt. The entire focusing mechanism moves internally, providing 28mm of precise travel while maintaining perfect optical alignment. This design is critical for maintaining a flat field, as it prevents the drawtube sag that can compromise edge-of-field star shapes.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEAF Compatible:\u003c\/strong\u003e The focuser is designed for seamless integration with the ZWO EAF and other popular electronic focusers for automated, repeatable focusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlexible Back Spacing:\u003c\/strong\u003e With a working distance of 58mm to 30mm, you have ample room to incorporate filter wheels, off-axis guiders, and other accessories into your imaging train.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Rotator \u0026amp; Tilt Adapter:\u003c\/strong\u003e The package includes a camera angle rotator and tilt adjuster, giving you full control over framing and sensor plane alignment right out of the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eVixen \u0026amp; Arca-Swiss Mounting: 1.67 kg for Any Mount\u003c\/h3\u003e\n\u003cp\u003eEngineered for portability, the MiniCat 51 OTA weighs a mere 1.67 kg and has a compact 210mm tube length. This makes it an ideal match for lightweight star trackers and portable GoTo mounts, allowing you to build a powerful imaging rig that travels easily. The integrated dual-spec dovetail plate provides native compatibility with both traditional Vixen-style saddles and modern Arca-Swiss tripod heads, offering maximum flexibility for mounting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMiniCat 51 vs. RedCat 51: Focal Ratio and Focuser Design\u003c\/h3\u003e\n\u003cp\u003eWhile both astrographs share a 51mm aperture, the MiniCat 51 is a distinct instrument from its sibling, the RedCat 51. The choice between them depends on your specific imaging goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedCat 51 Advantage:\u003c\/strong\u003e The RedCat 51's 250mm focal length (f\/4.9) provides slightly more image scale for smaller deep-sky objects. Its helical focuser is simple and robust for manual focusing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMiniCat 51 Advantage:\u003c\/strong\u003e The MiniCat 51 is significantly faster at f\/3.5 and offers a wider 178mm focal length, making it superior for capturing enormous nebulae and multi-panel mosaics. Its WIFD rack-and-pinion focuser is built from the ground up for EAF automation and heavier camera loads, eliminating the image shift that can occur with helical focusers during autofocus routines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics MiniCat 51 require a field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. The \u003cstrong\u003e6-element Petzval optical design\u003c\/strong\u003e provides a natively flat field across its 43.2mm image circle. This simplifies your imaging train and ensures sharp stars edge-to-edge with full-frame cameras without any additional accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the back spacing of the MiniCat 51 WIFD?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe MiniCat 51 has a flexible back spacing range from \u003cstrong\u003e58mm to 30mm\u003c\/strong\u003e from the M48 thread. This provides ample room to accommodate various accessories like filter drawers, off-axis guiders, and different camera sensor depths while achieving perfect focus.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan the MiniCat 51 be used on a portable star tracker?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. With an OTA weight of just \u003cstrong\u003e1.67 kg (3.68 lbs)\u003c\/strong\u003e, the MiniCat 51 is an ideal payload for most portable star trackers and small equatorial mounts. Its light weight and compact 210mm tube length make it a perfect choice for a grab-and-go wide-field imaging setup.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow would the MiniCat 51 frame a large target like the Rho Ophiuchi cloud complex?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe MiniCat 51's \u003cstrong\u003e178mm focal length\u003c\/strong\u003e is perfectly suited for immense targets like Rho Ophiuchi or the Orion Nebula (M42) region. Paired with a full-frame camera, you can capture the entire complex, including the colorful nebulosity around Antares, in a single frame, a task impossible for longer focal length telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the WIFD focuser on the MiniCat 51 suitable for automated focusing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The WIFD is a rack-and-pinion focuser specifically designed to be compatible with the \u003cstrong\u003eZWO EAF\u003c\/strong\u003e and other popular electronic autofocuser systems. Unlike helical focusers, the WIFD moves the optics internally without rotation, preventing image shift and ensuring the precise, repeatable results needed for automated imaging sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat cameras can I use with the MiniCat 51?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe MiniCat 51 supports a wide range of cameras, including \u003cstrong\u003eFull Frame, APS-C, and Micro Four Thirds\u003c\/strong\u003e formats. It ships with a standard M48 camera adapter, and separate T-mounts are available for Canon EF\/RF, Nikon F\/Z, Sony E, Pentax K, MFT, and Fuji X systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Type\u003c\/td\u003e\n\u003ctd\u003e6-Element Petzval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eSuper ED Glass x2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e51 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e178 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/3.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e43.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eWIFD Rack \u0026amp; Pinion Focuser (EAF Compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e0-28 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Spacing\u003c\/td\u003e\n\u003ctd\u003e58-30mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Required\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported T-Mounts\u003c\/td\u003e\n\u003ctd\u003eCanon EF, RF, Nikon F, Z, Sony E, Pentax K, MFT (M4\/3), FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Camera Formats\u003c\/td\u003e\n\u003ctd\u003eFull Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail Type\u003c\/td\u003e\n\u003ctd\u003eVixen \u0026amp; Arca-Swiss Dual Plate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e210 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e1.67 kg \/ 3.68 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e2.29 kg \/ 5.05 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMiniCat 51 Main Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov Mask Focus Aid Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Ring \u0026amp; Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDual Vixen\/Arca-Swiss Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM48 Camera Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTilt Adjuster \u0026amp; Rotator (M54 → M48)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAllen Key Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Padded Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":49149195813149,"sku":"WO-T-C-MINI-RD","price":1363.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-MiniCat-51-1.jpg?v=1726067423"},{"product_id":"askar-sqa85-85mm-f-4-8-quintuplet-apo","title":"Askar SQA85 85mm f\/4.8 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e85mm Aperture\u003c\/li\u003e\n\u003cli\u003e408mm Focal Length (f\/4.8)\u003c\/li\u003e\n\u003cli\u003eQuintuplet Petzval APO Optical Design\u003c\/li\u003e\n\u003cli\u003eSupports Full-Frame (44mm) Image Circle\u003c\/li\u003e\n\u003cli\u003e3.64kg OTA Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar SQA85 85mm f\/4.8 Quintuplet APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar SQA85 is a dedicated astrograph designed around a 5-element Petzval optical system, delivering a natively flat field at a fast f\/4.8 focal ratio from its 85mm objective. This 408mm focal length instrument incorporates two SD glass elements for superior color correction and illuminates a full-frame image circle without requiring a separate flattener. Weighing just 3.64kg and measuring a compact 403mm with its dew shield retracted, the SQA85 provides a powerful, portable imaging platform for capturing expansive celestial targets.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eNative f\/4.8 Petzval Optics: A Flat Field for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe core of the SQA85 is its quintuplet Petzval APO objective, an integrated design that eliminates the need for a separate field flattener. This f\/4.8 system provides sharp, pinpoint stars across a full-frame sensor right out of the box. The 408mm focal length is ideal for framing large deep-sky objects like the Andromeda Galaxy (M31) or the entire Veil Nebula complex.\u003c\/p\u003e\n\u003cp\u003eTo ensure high-contrast images free of false color, the optical train includes two pieces of SD (Super ED) glass. This corrects for chromatic aberration, rendering stars as neutral white points against a dark sky background, which is critical for both broadband and narrowband imaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging-Ready Mechanics: 3.64kg OTA with Versatile M48\/M54\/M68 Adapters\u003c\/h3\u003e\n\u003cp\u003eWith a bare optical tube assembly weight of 3.64kg, the SQA85 is light enough for a wide range of portable tracking mounts, minimizing payload demands while maximizing stability. The physical design is compact, with a total length of just 403mm when the dew shield is contracted, making it easy to transport and store.\u003c\/p\u003e\n\u003cp\u003eFor secure imaging train connections, the SQA85 includes M48, M54, and M68 adapters, allowing you to directly thread your filter wheel, off-axis guider, or camera. The system supports a back focus distance from 40mm to 70mm, with the standard 55mm being the recommended distance for use with most DSLR and dedicated astronomy cameras.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSQA85 Petzval vs. Triplet + Flattener: The Simplicity of an Integrated System\u003c\/h3\u003e\n\u003cp\u003eWhile a traditional triplet refractor combined with a separate field flattener offers modularity, it also introduces complexity and potential sources of error. The primary advantage of the SQA85's integrated quintuplet Petzval design is the elimination of spacing guesswork and potential optical tilt between the objective and the corrector.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriplet + Flattener Trade-off:\u003c\/strong\u003e The main advantage of a modular system is the ability to use the telescope visually without the flattener. However, achieving a perfectly flat field for imaging requires precise, calculated spacing that can be difficult to dial in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAskar SQA85 Advantage:\u003c\/strong\u003e As a single, factory-optimized system, the SQA85 guarantees flat-field performance. There is only one connection point to worry about—setting your camera sensor at the recommended 55mm back focus. This reduces potential flexure points and simplifies your setup, letting you spend more time imaging and less time troubleshooting star shapes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does the Quintuplet Petzval design of the Askar SQA85 mean for imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eQuintuplet Petzval\u003c\/strong\u003e design means the Askar SQA85 has a built-in field flattener. You do not need to purchase a separate corrector to get sharp, pinpoint stars across a full-frame sensor. It is an integrated imaging system designed to work perfectly right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount do I need for the Askar SQA85?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SQA85 has an optical tube weight of \u003cstrong\u003e3.64kg\u003c\/strong\u003e and a gross weight of \u003cstrong\u003e4.62kg\u003c\/strong\u003e (including tube rings and a dovetail plate). A mid-sized equatorial mount with a payload capacity of 25-30 lbs (11-13 kg) or more, such as a Sky-Watcher HEQ5 or iOptron CEM26, would be an excellent match for stable, long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Askar SQA85's 408mm focal length perform on large targets like the Andromeda Galaxy (M31) with a full-frame camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e408mm focal length\u003c\/strong\u003e is perfectly suited for this scenario. On a full-frame sensor, the Askar SQA85 will frame the entire Andromeda Galaxy (M31), including its satellite galaxies M32 and M110, with ample room to spare. This makes it an ideal instrument for capturing the full extent of large nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I connect my camera to the Askar SQA85?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SQA85 includes \u003cstrong\u003eM48, M54, and M68\u003c\/strong\u003e threaded adapters at the rear. The most common connection is the M48x0.75 thread. You simply add the necessary extension tubes to place your camera's sensor at the recommended \u003cstrong\u003e55mm back focus distance\u003c\/strong\u003e from the adapter's flange.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Askar SQA85's f\/4.8 focal ratio fast enough for narrowband imaging of the Cygnus Loop?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The \u003cstrong\u003ef\/4.8\u003c\/strong\u003e focal ratio is considered very fast for astrophotography. This speed allows you to gather significant signal in a shorter amount of time, which is a major advantage for narrowband imaging of faint targets like the Cygnus Loop. You can capture deep data with shorter sub-exposures compared to a slower f\/6 or f\/7 refractor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the two SD glass elements in the Askar SQA85 objective?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe two \u003cstrong\u003eSD (Super ED) glass elements\u003c\/strong\u003e provide excellent chromatic aberration correction. This means that different colors of light are brought to the same focal point, resulting in sharp, high-contrast images without distracting purple or blue halos around bright stars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e85mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e408mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eQuintuplet Petzval APO (with 2 SD glass elements)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat \/ Image Circle\u003c\/td\u003e\n\u003ctd\u003eFull-frame (44mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e3.64kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e4.62kg (including tube ring and dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e403mm (dew shield contracted) | 439mm (dew shield stretched)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear-End Thread Adapters\u003c\/td\u003e\n\u003ctd\u003eM48, M54, M68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e40mm - 70mm (55mm recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar SQA85 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOxford Cloth Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_SQA85_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Drivers\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":49200813867293,"sku":"ASK-SQA85","price":3353.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-SQA85-1.jpg?v=1727373818"},{"product_id":"askar-sqa106-106mm-f-4-8-quintuplet-apo","title":"Askar SQA106 106mm f\/4.8 Quintuplet APO","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e106mm Aperture\u003c\/li\u003e\n\u003cli\u003ef\/4.8 Focal Ratio\u003c\/li\u003e\n\u003cli\u003e509mm Focal Length\u003c\/li\u003e\n\u003cli\u003eQuintuplet Petzval APO Optical Design\u003c\/li\u003e\n\u003cli\u003e55mm Image Circle for Medium Format\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar SQA106 106mm f\/4.8 Quintuplet APO\u003c\/h2\u003e\n\u003cp\u003eThe Askar SQA106 combines a 106mm aperture with a fast f\/4.8 focal ratio, delivering a 509mm focal length ideal for wide-field astrophotography. Its integrated five-element Petzval design, which includes two SD glass elements, produces a corrected 55mm image circle for medium format sensors without requiring a separate flattener. With a gross weight of 8.12kg including its tube rings and dovetail, this Quintuplet APO provides a complete, flat-field imaging solution right out of the box.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA 106mm f\/4.8 Quintuplet APO with 2 SD Elements\u003c\/h3\u003e\n\u003cp\u003eThe core of the SQA106 is its self-flattening Quintuplet Petzval optical system. This five-element design incorporates two pieces of SD (Super ED) glass to achieve apochromatic color correction, suppressing chromatic aberration for high-contrast images with sharp, color-pure stars. The f\/4.8 focal ratio gathers significant light, reducing required exposure times on faint deep-sky objects like the North American Nebula (NGC 7000) or the Heart Nebula (IC 1805).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Illumination for Medium Format Sensors\u003c\/h3\u003e\n\u003cp\u003eEngineered for large-format imaging, the Askar SQA106 produces a corrected 55mm image circle. This not only covers standard 44mm full-frame sensors with excellent illumination to the corners but is also large enough for many medium format CMOS and CCD cameras. This capability ensures your investment is future-proof as sensor sizes continue to grow, eliminating concerns about vignetting and field curvature on today's largest amateur sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e8.12kg Gross Weight and Imaging-Ready Adapters\u003c\/h3\u003e\n\u003cp\u003eThe SQA106 is built for serious imaging. The optical tube alone weighs 5.82kg, and the complete assembly with tube rings and dovetail plate comes to 8.12kg, requiring a mid-range equatorial mount for stable tracking. The rear of the focuser includes M68, M54, and M48 adapters, providing direct, threaded connections for a wide range of cameras and filter wheels. A flexible back focus range from 48mm to 78mm, with a recommended distance of 55mm, accommodates various imaging train configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eSQA106 Petzval Design vs. Triplet + Flattener Systems\u003c\/h3\u003e\n\u003cp\u003eUnlike conventional triplet refractors that require a separate, carefully spaced field flattener, the SQA106's Petzval design has the correction elements built directly into the main optical tube. This offers a significant advantage in simplicity and reliability.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuaranteed Flat Field:\u003c\/strong\u003e There is no guesswork involved in achieving the correct flattener-to-sensor spacing. The SQA106 is designed to be perfectly flat at its native focal plane.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Connections:\u003c\/strong\u003e An integrated design means fewer potential points of flexure or tilt in your imaging train compared to adding an external corrector.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrade-off:\u003c\/strong\u003e The primary trade-off is a lack of modularity. While a triplet can be used with different reducers or flatteners, the SQA106 is optimized for one specific focal length and image circle. For imagers seeking a dedicated, hassle-free wide-field instrument, the SQA106's integrated approach is superior.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat type of equatorial mount is required for the Askar SQA106?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a gross weight of \u003cstrong\u003e8.12kg\u003c\/strong\u003e for the OTA, rings, and dovetail, plus the weight of your camera and guide scope, the total imaging payload will likely be around 10-12kg. A mount with a payload capacity of at least 18kg (40 lbs), such as a Celestron CGEM II or Sky-Watcher EQ6-R Pro, is recommended for stable, long-exposure astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Askar SQA106 need a separate field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The SQA106 features a \u003cstrong\u003eQuintuplet Petzval APO\u003c\/strong\u003e optical design, which has the field-flattening elements built directly into the telescope. This provides a corrected, flat field across its 55mm image circle without any additional accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I set the correct back focus for my camera with the SQA106?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Askar SQA106 supports a back focus range from 48mm to 78mm from the base of the M48 adapter threads. The \u003cstrong\u003erecommended back focus is 55mm\u003c\/strong\u003e, which is standard for most DSLRs with a T-ring and many dedicated astronomy cameras. Simply add spacers as needed to place your camera's sensor at this distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the advantage of the SQA106's 55mm image circle for a full-frame (44mm) camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eUsing a sensor smaller than the maximum corrected image circle provides significant benefits. With a \u003cstrong\u003e44mm full-frame sensor\u003c\/strong\u003e inside the SQA106's \u003cstrong\u003e55mm image circle\u003c\/strong\u003e, you are imaging with the best-corrected central part of the field. This results in tighter star shapes, more even illumination, and minimal optical aberrations at the extreme corners of your images.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar SQA106 perform on a large target like the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SQA106 is exceptionally well-suited for targets like the Andromeda Galaxy (M31). At a \u003cstrong\u003e509mm focal length\u003c\/strong\u003e, it can frame the entire galaxy, including its faint outer arms, on a full-frame sensor. The fast \u003cstrong\u003ef\/4.8 focal ratio\u003c\/strong\u003e will help capture the faint dust lanes and star-forming regions with shorter total integration time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Quintuplet APO with two SD glass elements\" mean for my images?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis describes the optical design. \u003cstrong\u003e\"Quintuplet\"\u003c\/strong\u003e means there are five lenses. \u003cstrong\u003e\"APO\" (Apochromatic)\u003c\/strong\u003e means it's highly corrected for color fringing. The \u003cstrong\u003e\"two SD glass elements\"\u003c\/strong\u003e are the specific type of low-dispersion glass used to achieve that color correction. The result is high-contrast images with sharp, natural-colored stars without distracting purple or blue halos.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e106mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e509mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eQuintuplet Petzval APO (2x SD Glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e55mm (Medium Format), covers 44mm (Full Frame)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus Range\u003c\/td\u003e\n\u003ctd\u003e48mm - 78mm (55mm Recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003eM48, M54, M68\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e5.82 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight (with rings)\u003c\/td\u003e\n\u003ctd\u003e8.12 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e516mm (Retracted) \/ 586mm (Extended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar SQA106 OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eOxford Cloth Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_SQA106_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.sharpstar-optics.com\/download_list_1\/7.html\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":49344703267101,"sku":"ASK-SQA106","price":4753.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/dfd18ed2-7af7-44b1-a8f8-aaaaa1b22ac6.png?v=1730997970"},{"product_id":"william-optics-redcat-91-wifd","title":"William Optics Cat 91 WIFD","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e91mm Aperture, 448mm Focal Length (f\/4.9)\u003c\/li\u003e\n\u003cli\u003e5-Element Advanced Petzval Optical Design\u003c\/li\u003e\n\u003cli\u003e55mm Corrected Image Circle\u003c\/li\u003e\n\u003cli\u003eWIFD Rack \u0026amp; Pinion Internal Focuser\u003c\/li\u003e\n\u003cli\u003e4.72 kg Optical Tube Assembly Weight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eWilliam Optics Cat 91 WIFD\u003c\/h2\u003e\n\u003cp\u003eThe William Optics Cat 91 WIFD integrates a 5-element Petzval optical system into a 91mm aperture to deliver a perfectly flat 55mm image circle with zero need for an additional flattener. Its fast f\/4.9 focal ratio and 448mm focal length are engineered for capturing wide-field deep-sky targets on full-frame and medium-format sensors. The entire optical tube assembly weighs only 4.72 kg, making it a portable yet powerful astrograph for demanding imagers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e5-Element Petzval Optics: f\/4.9 Speed and 448mm Reach\u003c\/h3\u003e\n\u003cp\u003eThe Cat 91's optical core is an advanced 5-element Petzval design that corrects for field curvature internally, eliminating the complexity of calculating back focus for an external flattener. This system uses two Super ED glass elements plus ED, Lanthanum, and another specialized element to achieve apochromatic color correction, rendering stars as sharp points with no distracting chromatic aberration. The native f\/4.9 focal ratio gathers significant light, reducing your total exposure time on faint nebulae and galaxies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e55mm Image Circle for Full-Frame and Medium-Format Sensors\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically for modern large-format sensors, the Cat 91 projects a fully illuminated and corrected 55mm image circle. This comfortably covers full-frame (36x24mm) and even larger medium-format sensors without vignetting or edge-of-field distortion. The system includes M48 and M54 adapters with precise back spacing requirements of 60.8mm and 65.8mm respectively, ensuring your sensor is placed at the optimal focal plane for edge-to-edge sharpness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWIFD Focuser: 36mm of Precise, Internal Travel\u003c\/h3\u003e\n\u003cp\u003eFocusing is managed by the William Optics Internal Focus Design (WIFD), a robust rack-and-pinion mechanism that moves the lens assembly internally. This design prevents the camera from sagging or tilting, a common issue with heavy imaging trains on traditional focusers. With 36mm of precise travel and direct compatibility with popular electronic auto-focusers (EAF), the WIFD system maintains rigidity and focus stability throughout an imaging session.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the William Optics Cat 91 require a separate field flattener?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, it does not. The \u003cstrong\u003eWilliam Optics Cat 91\u003c\/strong\u003e uses a 5-element Petzval optical design, which has a flattener built directly into the optical train. This provides a flat field across its entire 55mm image circle without any additional accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the correct back spacing for my camera with the Cat 91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe required back spacing for the Cat 91 depends on the adapter you use. With the included M48 adapter, the required distance from the adapter's threads to your camera sensor is \u003cstrong\u003e60.8mm\u003c\/strong\u003e. With the M54 adapter, the required distance is \u003cstrong\u003e65.8mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Cat 91's f\/4.9 ratio affect imaging the Andromeda Galaxy (M31)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe fast \u003cstrong\u003ef\/4.9 focal ratio\u003c\/strong\u003e allows the Cat 91 to collect light very efficiently. When imaging a large, relatively bright target like the Andromeda Galaxy (M31), this means you can capture significant detail in its spiral arms and faint dust lanes with shorter individual sub-exposures compared to a slower f\/6 or f\/7 refractor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics Cat 91 compatible with my ZWO EAF?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the WIFD (William Optics Internal Focus Design) focuser on the Cat 91 is fully compatible with ZWO EAF and other popular electronic autofocuser systems. This allows for precise, automated focusing for astrophotography.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a full-frame DSLR camera with the Cat 91?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The Cat 91's \u003cstrong\u003e55mm image circle\u003c\/strong\u003e is designed to fully illuminate full-frame sensors (typically 43mm diagonal) with no vignetting. You will need the appropriate T-mount adapter for your camera brand (e.g., Canon EF, Nikon F), which connects to the included M48 or M54 camera adapters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of mount is needed for the 4.72 kg Cat 91 OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith an OTA weight of \u003cstrong\u003e4.72 kg (10.41 lbs)\u003c\/strong\u003e, and a total weight with accessories around 6.3 kg, the Cat 91 works well on mid-range equatorial mounts. For imaging, a mount with a payload capacity of at least 25-30 lbs (11-14 kg) is recommended to ensure stability once you add a guide scope, cameras, and other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Type\u003c\/td\u003e\n\u003ctd\u003e5-Element Advanced Petzval\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eSuper ED Glass x2, ED Glass x1, Lanthanum Glass x1, X-Element x1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e91 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e448 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage Circle\u003c\/td\u003e\n\u003ctd\u003e55 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eWIFD R\u0026amp;P Focuser, EAF Compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser Travel\u003c\/td\u003e\n\u003ctd\u003e0-36 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Spacing (M48)\u003c\/td\u003e\n\u003ctd\u003e60.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Spacing (M54)\u003c\/td\u003e\n\u003ctd\u003e65.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlattener Required\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupported Camera Formats\u003c\/td\u003e\n\u003ctd\u003eMedium Format, Full Frame, APS-C, M4\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eT-Mount Support\u003c\/td\u003e\n\u003ctd\u003eCanon EF\/RF, Nikon F\/Z, Sony E, Pentax K, MFT, FUJI X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDovetail\u003c\/td\u003e\n\u003ctd\u003eVixen-style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Length\u003c\/td\u003e\n\u003ctd\u003e556 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e4.72 kg \/ 10.41 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Weight\u003c\/td\u003e\n\u003ctd\u003e6.3 kg \/ 13.89 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eCat 91 Main Tube\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBahtinov Mask Lens Cap\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eMounting Ring \u0026amp; Handle Bar\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eVixen-style Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM63 to M54 Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eM63 to M48 Adapter\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTilt Adjuster \u0026amp; Rotator\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eRiser Blocks\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 set\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAllen Key Set\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSoft Carry Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/william-optics-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"William Optics","offers":[{"title":"Black","offer_id":49399187898653,"sku":"WO-T-C-91","price":4137.0,"currency_code":"CAD","in_stock":true},{"title":"Red","offer_id":49399187931421,"sku":"WO-T-C-91-RD","price":3741.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Cat-91-WIFD-pers-1.jpg?v=1732304628"},{"product_id":"askar-160apo-f-7-triplet","title":"Askar 160APO f\/7 Triplet","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e160mm Aperture Triplet Air-Spaced APO Objective\u003c\/li\u003e\n\u003cli\u003e1120mm Focal Length at f\/7\u003c\/li\u003e\n\u003cli\u003eIncludes One ED Glass Element for Color Correction\u003c\/li\u003e\n\u003cli\u003eRetractable Dew Shield and Rear Tube for Compact Transport\u003c\/li\u003e\n\u003cli\u003e11.4kg OTA Weight (13.6kg with Rings and Plate)\u003c\/li\u003e\n\u003cli\u003eSupports Full-Frame Imaging with a 44mm Image Circle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eFAQ\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eDownloads\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003eAskar 160APO f\/7 Triplet Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Askar 160APO delivers the immense light-gathering power of a 160mm aperture combined with the color fidelity of an f\/7 air-spaced triplet objective. Its 1120mm focal length provides the image scale necessary to resolve fine detail on planets and in small galaxies, while the optical design, which includes one ED glass element, ensures high-contrast, apochromatic views. Weighing 13.6kg fully equipped, this telescope is a serious imaging instrument built for observatory-class mounts.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eThe 160mm f\/7 Triplet APO Objective\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 160APO is its 160mm air-spaced triplet objective. This design uses an ED (Extra-low Dispersion) glass element to minimize chromatic aberration, producing sharp stars with no distracting color fringing. The f\/7 focal ratio strikes a balance between providing a large image scale at 1120mm and maintaining a manageable physical length for mounting and transport.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eA Retractable Body: 883mm Transport Length and 115mm of Adjustment\u003c\/h3\u003e\n\u003cp\u003eFor an instrument of this aperture, portability is a key engineering challenge. Askar addresses this with a dual-retractable design. The dew shield retracts to shorten the overall length to just 883mm for storage and transport, and extends to 996mm for observing. More critically, the rear lens tube itself offers 115mm of retraction, a crucial feature for balancing the 11.4kg OTA when switching between lightweight eyepieces and heavy, full-frame imaging trains.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eImaging Platform: A 44mm Image Circle for Full-Frame Sensors\u003c\/h3\u003e\n\u003cp\u003eThe Askar 160APO is engineered as a capable astrograph. It is designed to produce a 44mm image circle, which is large enough to fully illuminate the sensors of full-frame DSLR, mirrorless, and dedicated astronomy cameras without significant vignetting. This makes it an ideal platform for capturing wide, deep vistas of large nebulae and star fields, taking full advantage of the telescope's 160mm aperture.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eAskar 160APO vs. Other Large Refractors: Weight and Portability\u003c\/h3\u003e\n\u003cp\u003eWhen considering a refractor of this size, the primary trade-off is aperture versus weight. At a gross weight of 13.6kg with its included 400mm Losmandy plate and rings, the Askar 160APO requires a substantial German equatorial mount. However, its retractable design gives it a significant advantage in portability and setup efficiency compared to fixed-tube refractors of similar focal length, making it a more practical option for imagers who travel to dark sky sites.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat class of mount is required for the Askar 160APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith a fully dressed weight of \u003cstrong\u003e13.6kg (30 lbs)\u003c\/strong\u003e before adding a camera, guide scope, or other accessories, the Askar 160APO requires a heavy-duty equatorial mount. For stable imaging, you should consider a mount with a payload capacity of at least 50-60 lbs, such as a Sky-Watcher EQ8-R, iOptron CEM70, or larger model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the Askar 160APO fully illuminate a full-frame camera sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The optical system is designed to produce a \u003cstrong\u003e44mm corrected image circle\u003c\/strong\u003e. This is large enough to cover a standard 36mm x 24mm full-frame sensor, making it an excellent choice for wide-field astrophotography with cameras like the ZWO ASI6200MM\/MC Pro or a DSLR.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Askar 160APO perform on faint details in the Orion Nebula (M42)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e160mm aperture\u003c\/strong\u003e provides excellent light-gathering capability, allowing you to resolve the faint outer loops of gas and dust in M42. The \u003cstrong\u003e1120mm focal length\u003c\/strong\u003e provides the necessary image scale to clearly separate the four main stars of the Trapezium cluster at the nebula's core, even under moderately good seeing conditions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the 115mm retractable rear tube on the 160APO?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \u003cstrong\u003e115mm retractable section\u003c\/strong\u003e at the rear of the telescope serves two main purposes. First, it allows for more compact storage. Second, and more importantly, it helps you achieve proper balance on the mount by shifting the center of gravity. This is especially useful when switching between a lightweight visual setup and a heavy imaging train with a filter wheel and off-axis guider.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 1120mm focal length of the 160APO suitable for imaging smaller galaxies like the Whirlpool Galaxy (M51)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the \u003cstrong\u003e1120mm focal length\u003c\/strong\u003e is well-suited for medium-to-small deep-sky objects. It provides enough magnification to frame M51 and its companion galaxy nicely, allowing you to resolve spiral arm structure and dust lanes, especially when paired with a camera with smaller pixels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the single ED element in the Askar 160APO's triplet lens affect performance?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe single ED glass element in the \u003cstrong\u003eair-spaced triplet objective\u003c\/strong\u003e is crucial for its apochromatic (APO) designation. It works to bring different wavelengths of light to a very close focal point, significantly reducing chromatic aberration (false color). This results in higher contrast and sharper stars compared to a doublet or achromat of the same size.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e160mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e1120mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens\u003c\/td\u003e\n\u003ctd\u003eTriplet air-spaced APO (with one ED glass)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOTA Weight\u003c\/td\u003e\n\u003ctd\u003e11.4kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGross Weight\u003c\/td\u003e\n\u003ctd\u003e13.6kg (including tube rings and dovetail plate)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length\u003c\/td\u003e\n\u003ctd\u003e883mm (dew shield contracted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Length (Extended)\u003c\/td\u003e\n\u003ctd\u003e996mm (dew shield stretched)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Tube Retraction\u003c\/td\u003e\n\u003ctd\u003e115mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear Adapters\u003c\/td\u003e\n\u003ctd\u003e2\" and 1.25\" visual adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e160APO OTA\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTube Rings\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1 Pair\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eHandle\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAskar 400mm Losmandy Dovetail Plate\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eAluminum Carrying Case\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eManual\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar_160APO_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath d=\"M0 64C0 28.7 28.7 0 64 0L224 0l0 128c0 17.7 14.3 32 32 32l128 0 0 144-208 0c-35.3 0-64 28.7-64 64l0 144-48 0c-35.3 0-64-28.7-64-64L0 64zm384 64l-128 0L256 0 384 128zM176 352l32 0c30.9 0 56 25.1 56 56s-25.1 56-56 56l-16 0 0 32c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-48 0-80c0-8.8 7.2-16 16-16zm32 80c13.3 0 24-10.7 24-24s-10.7-24-24-24l-16 0 0 48 16 0zm96-80l32 0c26.5 0 48 21.5 48 48l0 64c0 26.5-21.5 48-48 48l-32 0c-8.8 0-16-7.2-16-16l0-128c0-8.8 7.2-16 16-16zm32 128c8.8 0 16-7.2 16-16l0-64c0-8.8-7.2-16-16-16l-16 0 0 96 16 0zm80-112c0-8.8 7.2-16 16-16l48 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 32 32 0c8.8 0 16 7.2 16 16s-7.2 16-16 16l-32 0 0 48c0 8.8-7.2 16-16 16s-16-7.2-16-16l0-64 0-64z\" fill=\"#0047a7\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Manual\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/askar-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eAskar 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":49580263178525,"sku":"ASK-ASKAPO160","price":5383.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Askar-160APO.jpg?v=1737053717"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/apochromatic-refractors.oembed?page=2","provider":"David Astro","version":"1.0","type":"link"}