{"product_id":"svbony-sv48p-90mm-f-5-5-achromatic-refractor-telescope-ota","title":"SVBONY SV48P 90mm f\/5.5 Achromatic Refractor Telescope OTA","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e90mm Aperture\u003c\/li\u003e\n\u003cli\u003e500mm Focal Length (f\/5.5)\u003c\/li\u003e\n\u003cli\u003eAchromatic Doublet Lens\u003c\/li\u003e\n\u003cli\u003e2-inch Dual-Speed Rack-and-Pinion Focuser\u003c\/li\u003e\n\u003cli\u003eFully Multi-Coated (FMC) Optics\u003c\/li\u003e\n\u003cli\u003eNet Weight: 2730g (96.3oz)\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\u003eSVBONY SV48P 90mm f\/5.5 Achromatic Refractor Telescope OTA\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY SV48P combines a 90mm aperture with a fast f\/5.5 focal ratio, creating a 500mm focal length optical tube assembly built for wide-field astrophotography. Its air-spaced achromatic doublet lens uses ZF4\/K9 glass to gather significant light, while the 2-inch dual-speed Rack-and-Pinion focuser provides the fine control needed for critical camera focus. Weighing just 2730g, this OTA is a practical match for many portable equatorial 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\u003e90mm f\/5.5 Optics: A Wide-Field Imaging Platform\u003c\/h3\u003e\n\u003cp\u003eThe SV48P's optical design is centered on capturing large swaths of the night sky. The 90mm objective lens gathers more light than smaller 80mm refractors, and the short 500mm focal length (f\/5.5) creates a bright, expansive field of view. This combination is ideal for framing large deep-sky objects like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) on a camera sensor.\u003c\/p\u003e\n\u003cp\u003eAs an achromatic refractor, the SV48P offers excellent contrast and sharpness for its price, making it an accessible entry point into imaging. However, its doublet design means some chromatic aberration (a purple fringe on bright stars) is expected, a typical trade-off for the affordability and fast focal ratio compared to more expensive apochromatic (APO) designs.\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 2-inch Dual-Speed Focuser: Precision for Astrophotography\u003c\/h3\u003e\n\u003cp\u003eAchieving sharp focus is non-negotiable in astrophotography, and the SV48P is equipped with a robust 2-inch rack-and-pinion (RAP) focuser to meet this demand. The dual-speed mechanism features a 1:10 reduction ratio, allowing you to make extremely fine adjustments with the smaller knob, ensuring stars are tight and focused. This level of control is crucial when imaging with DSLRs or dedicated astronomy cameras.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2-inch Barrel:\u003c\/strong\u003e Accommodates wide-field 2-inch eyepieces, diagonals, and camera adapters for maximum flexibility and illumination of larger sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25-inch Adapter:\u003c\/strong\u003e A step-down adapter is included, providing compatibility with the vast majority of standard eyepieces and accessories.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRack-and-Pinion Design:\u003c\/strong\u003e Offers a higher load capacity than basic Crayford focusers, reducing slippage when using heavier imaging trains.\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 2730g OTA: Designed for Portable Mounts\u003c\/h3\u003e\n\u003cp\u003eAt a net body weight of 2730g (96.3 oz), the SV48P optical tube assembly is light enough to be carried effectively by a wide range of entry-level and portable equatorial mounts. This makes it an excellent choice for a \"grab-and-go\" imaging rig or for traveling to dark sky sites. The 108mm tube outer diameter is standard, allowing for easy mounting with common tube ring sizes.\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\u003eSVBONY SV48P vs. an 80mm ED Refractor: Aperture vs. Color Correction\u003c\/h3\u003e\n\u003cp\u003eWhen considering the SV48P, a common comparison is against an 80mm ED doublet refractor. The choice between them depends on your primary goal and budget.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe ED Refractor's Advantage:\u003c\/strong\u003e An 80mm ED scope will use extra-low dispersion glass to virtually eliminate the chromatic aberration (purple fringing) seen in the SV48P. This results in higher-fidelity color on bright stars and is a significant optical advantage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe SV48P's Advantage:\u003c\/strong\u003e The SV48P offers a larger 90mm aperture, which translates to roughly 26% more light-gathering power than an 80mm scope. This allows for slightly shorter exposures on faint nebulae. Most significantly, the SV48P achieves this larger aperture at a much more accessible price point, making it a compelling option for those starting in wide-field 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 is the SVBONY SV48P 90mm OTA best suited for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY SV48P is primarily designed for wide-field astrophotography of large deep-sky objects like nebulae and galaxies, thanks to its fast \u003cstrong\u003ef\/5.5 focal ratio\u003c\/strong\u003e and \u003cstrong\u003e500mm focal length\u003c\/strong\u003e. It also serves as a great rich-field visual telescope for sweeping the Milky Way with a low-power 2-inch eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SV48P 90mm perform on bright targets like Jupiter or the Moon?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor visual use, the SV48P will show details like Jupiter's main cloud belts and the Moon's craters. However, as an achromatic refractor, you will notice some chromatic aberration (a purple or blue halo) around the edges of these bright objects. This is a normal characteristic of this optical design and is most prominent at high magnification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the SVBONY SV48P for imaging with a portable star tracker?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. With a net weight of only \u003cstrong\u003e2730g\u003c\/strong\u003e, the SV48P OTA is light enough for many higher-capacity star trackers and small equatorial mounts. Its \u003cstrong\u003e500mm focal length\u003c\/strong\u003e is also forgiving enough for these mounts to produce sharp images of targets like the Andromeda Galaxy (M31) or the Orion Nebula (M42).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see purple fringing (chromatic aberration) with the SV48P?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, some purple fringing on the brightest stars is expected. The SVBONY SV48P is an \u003cstrong\u003eachromatic doublet refractor\u003c\/strong\u003e, which corrects for two wavelengths of light but allows some minor false color. This can be significantly reduced with post-processing techniques or by using a minus-violet or light pollution filter during imaging.\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 SV48P OTA?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SV48P is sold as an Optical Tube Assembly (OTA) only. To use it, you will need to provide your own:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eEquatorial or Alt-Az mount\u003c\/li\u003e\n\u003cli\u003eTube rings and dovetail bar\u003c\/li\u003e\n\u003cli\u003eStar diagonal (1.25\" or 2\")\u003c\/li\u003e\n\u003cli\u003eEyepieces (1.25\" or 2\") or a camera\u003c\/li\u003e\n\u003cli\u003eFinder scope or red dot finder\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 dual-speed focuser on the SV48P help with imaging?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe dual-speed focuser has two knobs. The larger knob makes coarse adjustments to find general focus quickly. The smaller knob moves the focuser at a \u003cstrong\u003e1:10 ratio\u003c\/strong\u003e, meaning one turn of the fine knob equals 1\/10th of a turn of the coarse knob. This allows for extremely precise adjustments, which are essential for getting perfectly sharp stars in your astrophotos.\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\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eSVBONY\u003c\/td\u003e\n\u003c\/tr\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\/5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eObjective Lens Design\u003c\/td\u003e\n\u003ctd\u003eDoublet air spaced achromatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Glass\u003c\/td\u003e\n\u003ctd\u003eZF4\/K9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (FMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003e2-inch Rack-and-Pinion (RAP) Double-speed Focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyepiece Barrel Diameter\u003c\/td\u003e\n\u003ctd\u003e2-inch (with 1.25-inch adapter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Outer Diameter\u003c\/td\u003e\n\u003ctd\u003e108mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Body Weight\u003c\/td\u003e\n\u003ctd\u003e2730g \/ 96.3oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePacking Dimensions\u003c\/td\u003e\n\u003ctd\u003e490 x 215 x 230mm\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\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY_SV48P_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\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eSVBONY SV48P 90mm f\/5.5 Refractor 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\"\u003e1.25-inch 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\"\u003eLens 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\"\u003eDust Plug\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\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861224485149,"sku":"SV-F9341A","price":293.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-SV48P-90mm-f-5-5-Achromatic-Refractor-Telescope-OTA-for-Imaging-1_545789b5-46f7-46f3-9746-8bd86f76b3c8.jpg?v=1788884029","url":"https:\/\/davidastro.com\/products\/svbony-sv48p-90mm-f-5-5-achromatic-refractor-telescope-ota","provider":"David Astro","version":"1.0","type":"link"}