{"title":"William Optics RedCat Telescopes","description":"\u003cp\u003eWilliam Optics RedCat telescopes are small Petzval apochromats known for wide-field astrophotography with a DSLR, mirrorless or astronomy camera, with a flat field built into the design. The RedCat 51 is available as the Gen II U f\/4.9 and in a WIFD version with internal focusing.\u003c\/p\u003e\u003cp\u003eThe RedCat 61 WIFD and RedCat 71 WIFD offer more aperture for the same grab-and-go format. A 1.25\" RedCat WIFD erecting prism turns the scope into a correct-image spotter for visual use.\u003c\/p\u003e","products":[{"product_id":"william-optics-redcat-erecting-prism-1-25-silver-version","title":"William Optics RedCat WIFD Erecting Prism - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eConverts Astronomical Telescopes for Terrestrial Viewing\u003c\/li\u003e\n\u003cli\u003e90-Degree Viewing Angle\u003c\/li\u003e\n\u003cli\u003eAccepts Standard 1.25\" Eyepieces\u003c\/li\u003e\n\u003cli\u003eAnti-Reflection Coated BAK7 Prism\u003c\/li\u003e\n\u003cli\u003eCNC-Machined 6061T Aluminum Housing\u003c\/li\u003e\n\u003cli\u003eInternally Baffled and Matte Blackened to Maximize Contrast\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 RedCat WIFD Erecting Prism - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe William Optics RedCat WIFD Erecting Prism transforms your astronomical telescope into a powerful daytime spotting scope with its 90-degree, correct-image light path. Designed to fit any standard 1.25-inch focuser, this prism uses an anti-reflection coated BAK7 prism to deliver bright, sharp, and correctly oriented views, making it ideal for terrestrial observation.\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\u003eCorrect-Image Daytime Viewing with a 90-Degree BAK7 Prism\u003c\/h3\u003e\n\u003cp\u003eAn astronomical telescope naturally produces an inverted or mirror-reversed image, which is disorienting for terrestrial subjects. This 90-degree erecting prism corrects the image orientation both vertically and horizontally, allowing you to view ships on the horizon, wildlife, or distant landscapes as you would with your own eyes. The internal BAK7 prism is anti-reflection coated to ensure high light transmission for a clear and vibrant image.\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\u003eCNC-Machined 6061T Aluminum Construction\u003c\/h3\u003e\n\u003cp\u003eReflecting William Optics' commitment to quality, the entire prism housing is precision CNC-machined from a solid block of 6061T aluminum. The interior is matte blackened and threaded to absorb stray light, preventing internal reflections from reducing image contrast. Finished in the distinctive William Optics red anodizing, this erecting prism is built to provide durable, high-fidelity performance that perfectly complements the RedCat 51 WIFD and other premium refractors.\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 William Optics 1.25\" Erecting Prism do for my RedCat 51?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis prism converts your RedCat 51, or any telescope with a 1.25\" focuser, into a terrestrial spotting scope. It corrects the inverted and reversed image produced by the telescope, providing a view that is correctly oriented for daytime activities like birdwatching, nature observation, or surveillance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this William Optics prism for astronomy at night?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile you can use it for casual stargazing, an erecting prism is not ideal for critical astronomical observation. The complex light path required to correct the image can introduce minor aberrations and light loss compared to a high-quality mirror or Amici prism star diagonal. For the best possible astronomical views, a dedicated star diagonal is recommended.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will this 90-degree prism help with birdwatching using my RedCat 51 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor birdwatching, having a correctly oriented image is essential for tracking moving subjects. This 90-degree prism ensures that when you move the telescope up, the view moves up, and when you move it left, the view moves left. This intuitive control allows you to follow birds in flight or locate them in dense foliage much more easily than with an astronomical diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the difference between this erecting prism and a standard star diagonal?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard \u003cstrong\u003estar diagonal\u003c\/strong\u003e corrects the image vertically but leaves it mirror-reversed (left-to-right). This is acceptable for astronomy but confusing for terrestrial viewing. An \u003cstrong\u003eerecting prism\u003c\/strong\u003e, like this one, corrects the image on both axes, providing a fully correct, daytime-friendly view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eI want to use my William Optics RedCat 51 for plane spotting. Is this the right accessory?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, this is an excellent accessory for plane spotting. The fully corrected image allows you to track aircraft across the sky intuitively, and the 90-degree angle provides a comfortable viewing position when the telescope is pointed at high altitudes. The high-contrast optics will help you resolve details and airline liveries clearly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the William Optics Erecting Prism compatible with non-William Optics telescopes?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. This erecting prism uses a standard 1.25\" barrel, making it compatible with any telescope that accepts 1.25\" eyepieces and diagonals. You will just need to ensure your focuser has enough travel to reach focus with the prism in the optical train.\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\u003eType\u003c\/td\u003e\n\u003ctd\u003eErecting Prism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eViewing Angle\u003c\/td\u003e\n\u003ctd\u003e90-Degree\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrism Material\u003c\/td\u003e\n\u003ctd\u003eBAK7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eAnti-Reflection Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHousing Material\u003c\/td\u003e\n\u003ctd\u003eCNC-Machined 6061T Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eRed Anodized\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterior\u003c\/td\u003e\n\u003ctd\u003eMatte Blackened \u0026amp; Threaded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary Use\u003c\/td\u003e\n\u003ctd\u003eDaytime Terrestrial Observation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eDesigned for RedCat 51 WIFD, compatible with all 1.25\" focusers\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\"\u003eWilliam Optics RedCat WIFD Erecting Prism - 1.25\"\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\"\u003e1.25\" Dust 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\"\u003eEyepiece Dust 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\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":"Default Title","offer_id":44967224443165,"sku":"WO-D-EP90-125-RC51III","price":219.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/William-Optics-RedCat-Erecting-Prism-1-25-inch-Silver-Version-D-EP90-125-RC51-SL-1__00946.1596133250.1280.1280.jpg?v=1684339157"},{"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":"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"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/william-optics-redcat-telescopes.oembed","provider":"David Astro","version":"1.0","type":"link"}