{"product_id":"tele-vue-0-8x-reducer-for-np-scopes","title":"Tele Vue 0.8x Reducer for NP Scopes","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length Reduction Factor: 0.8x\u003c\/li\u003e\n\u003cli\u003eOptical Design: 4-element, 3-group\u003c\/li\u003e\n\u003cli\u003eTelescope Interface: 2.4\" Slip-fit Barrel\u003c\/li\u003e\n\u003cli\u003eCamera Interface: Threaded for Tele Vue Wide T-Adapters\u003c\/li\u003e\n\u003cli\u003eOptimal Back Focus: 56mm ± 2mm\u003c\/li\u003e\n\u003cli\u003eWeight: 14.4 oz (0.9 lbs \/ 408 g)\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\u003eCapture Wider Fields with Your Tele Vue Imaging System\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue NPR-2073 0.8x Reducer is an essential imaging accessory designed specifically for Tele Vue NP101is and NP127is telescopes. This 4-element focal reducer shortens the effective focal length of your Petzval astrograph by 20%, creating a faster, wider photographic system without compromising the flat-field performance that defines these instruments.\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 Faster, Wider Optical System\u003c\/h3\u003e\n\u003cp\u003eBy shortening your telescope's focal length, this 0.8x reducer provides a 25% wider field of view. This allows you to frame larger deep-sky objects, like the full expanse of the Andromeda Galaxy or the intricate nebulosity of the Veil Nebula complex, within a single shot. The reduction also creates a faster photographic system, dropping an f\/5.4 NP101is to f\/4.3, which reduces required exposure times by about 36% to achieve the same image brightness.\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\u003eFour-Element Correction for Flat Fields\u003c\/h3\u003e\n\u003cp\u003eThis is not a simple generic reducer. The NPR-2073 uses a sophisticated 4-element, 3-group optical design that is specifically matched to the Petzval optics of the NP-series telescopes. Its function is to reduce the focal length while maintaining the instrument's hallmark flat field and pinpoint stars to the edge of a full-frame sensor. The result is a wide, distortion-free image canvas, preserving the optical integrity of your imaging system.\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\u003eFully Multi-Coated Optics for Maximum Contrast\u003c\/h3\u003e\n\u003cp\u003eEach air-to-glass surface in the reducer features broadcast-quality multi-coatings to maximize light transmission and suppress reflections. This is critical when imaging faint objects, as it ensures that subtle details in nebulosity and faint galactic arms are not lost to scatter or ghosting. The high throughput delivers brighter images with a dark, high-contrast background, allowing the true structure of your target to stand out.\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\u003eSecure 2.4-inch Focuser Interface\u003c\/h3\u003e\n\u003cp\u003eThe reducer connects to the telescope via a 2.4-inch barrel, which inserts directly into the NP101is or NP127is focuser. This large-format connection guarantees a rigid, flex-free fit and prevents any vignetting that could occur with smaller 2-inch accessories. The secure attachment ensures your entire imaging train remains perfectly aligned, a critical factor for achieving sharp images over long exposures.\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 Back Focus for Optimal Performance\u003c\/h3\u003e\n\u003cp\u003eTo achieve the designed flat field, this reducer requires a precise back focus of 56mm (±2mm) from its rear flange to your camera sensor. This spacing is a critical specification, not a guideline. Tele Vue offers a range of precisely machined wide T-adapters and extension tubes that make achieving this distance straightforward for most popular DSLR, mirrorless, and dedicated astronomy cameras. Getting the spacing right is the key to unlocking the reducer's full performance potential.\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 with the 0.8x Reducer\u003c\/h3\u003e\n\u003cp\u003eWith the reducer installed on an NP127is, turning the telescope towards the Cygnus Loop reveals its true power. The faster f\/4.2 system allows you to gather significant signal on the delicate filaments of the Eastern and Western Veil in shorter sub-exposures. The wider field frames the entire supernova remnant, capturing Pickering's Triangle and the surrounding star clouds in one cohesive, sharp, and brilliantly contrasted image that a longer focal length would struggle to contain.\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 Note on Compatibility\u003c\/h3\u003e\n\u003cp\u003eIt is important to understand that this reducer's optical prescription is tailored exclusively for Tele Vue NP-series Imaging System (is) telescopes. It is not a general-purpose reducer and will not produce a corrected field if used with other Tele Vue models or telescopes from other manufacturers. This specificity is its strength, as it guarantees diffraction-limited performance within its designated system, but it also defines its primary limitation.\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\"\u003eWill this reducer work with my Tele Vue TV-85 or TV-76?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this reducer is specifically designed for the Petzval optics of the NP101is and NP127is telescopes. For other Tele Vue refractors like the TV-102, TV-85, or TV-76, you should use the TRF-2008 0.8x Reducer\/Flattener.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I get the correct 56mm back focus for my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTele Vue provides a range of wide T-adapters for specific camera brands (e.g., Canon EOS, Nikon F) that, when attached to this reducer, automatically set the correct 56mm spacing to the sensor. For other cameras, you may need a combination of standard adapters and spacers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the reducer change my telescope's focal length for visual use?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis is a photographic-only accessory. It is not designed to be used with eyepieces for visual observation and will not come to focus correctly with a diagonal in the optical train.\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 and the TRF-2008 reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe NPR-2073 is a pure reducer for the already flat-field NP scopes. The TRF-2008 is a reducer and flattener, designed to both reduce the focal length and correct field curvature in Tele Vue's doublet refractors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this reducer cover a full-frame (24x36mm) sensor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the reducer is designed to provide a fully illuminated and corrected field for sensors up to 43mm in diagonal (standard full-frame size) when used with an NP101is or NP127is 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\u003eProduct Code\u003c\/td\u003e\n\u003ctd\u003eNPR-2073\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length Reduction\u003c\/td\u003e\n\u003ctd\u003e0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4-element, 3-group\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Compatibility\u003c\/td\u003e\n\u003ctd\u003eTele Vue NP101is, NP127is\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003e2.4-inch barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Side Connection\u003c\/td\u003e\n\u003ctd\u003eThread for Tele Vue Imaging System Adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e56mm ± 2mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e14.4 oz \/ 408 g\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\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 0.8x Reducer for NP Scopes\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/TV-NPR-2073-1.jpg?v=1682548809\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e0.8x Reducer for NP Scopes\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\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue Dust Cap\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/TV-NPR-2073-2.jpg?v=1682548809\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Top)\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\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue Dust Cap\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/TV-NPR-2073-3.jpg?v=1682548809\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\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\/Tele_Vue_0.8x_Reducer_for_NP_Scopes_Manual.pdf\" target=\"_blank\"\u003e\u003csvg class=\"DAV-img-box\" viewbox=\"0 0 512 512\" xmlns=\"http:\/\/www.w.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\/tele-vue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTele Vue 5-Year Limited Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223883546909,"sku":"TV-NPR-2073","price":801.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_0.8x_Reducer_for_NP_Scopes_1.jpg?v=1777515016","url":"https:\/\/davidastro.com\/fr\/products\/tele-vue-0-8x-reducer-for-np-scopes","provider":"David Astro","version":"1.0","type":"link"}