{"product_id":"tele-vue-0-8x-reducer-flattener-for-102-scopes","title":"Tele Vue 0.8x Reducer-Flattener for 102 Scopes","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduction Factor: 0.8x\u003c\/li\u003e\n\u003cli\u003eEffective Focal Length (on TV-102): 704mm\u003c\/li\u003e\n\u003cli\u003eEffective Focal Ratio (on TV-102): f\/6.9\u003c\/li\u003e\n  \u003cli\u003eCompatibility: TV-102 and 800-1000mm focal length doublet refractor\u003c\/li\u003e\n\u003cli\u003eRequired Back Focus: 60.98mm\u003c\/li\u003e\n\u003cli\u003eConnection to Telescope: 2.4\" TeleVue Imaging System\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\u003eWider Fields and Faster Exposures for Your Tele Vue 102\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 0.8x Reducer-Flattener for 102 Scopes (RFL-4087) is a purpose-built optical corrector that transforms your Tele Vue-102 refractor into a flat-field, wide-view astrograph. This essential imaging accessory shortens your exposure times by 36% and delivers sharp, pinpoint stars across the entire frame of today's DSLR and dedicated astronomy cameras. It is engineered specifically to match the optical properties of the TV-102, providing a level of correction a generic reducer cannot achieve.\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\u003eCapture More Signal with 0.8x Focal Reduction\u003c\/h3\u003e\n\u003cp\u003eThe core of the RFL-4087 is its 0.8x focal reduction lens system. This design shortens the native 880mm focal length of a TV-102 telescope to a wider 704mm. This change converts the telescope from f\/8.6 to a faster f\/6.9 system, concentrating the same amount of light onto a smaller area of your camera sensor.\u003c\/p\u003e\n\u003cp\u003eThis increase in optical speed is a significant advantage for deep-sky imagers. It allows you to capture the same level of detail and signal in about two-thirds of the time, reducing demands on your mount's tracking accuracy and letting you gather more data on faint nebulae and galaxies in a single 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\u003eAchieve Pinpoint Stars with a Flat-Field Design\u003c\/h3\u003e\n\u003cp\u003eRefractor telescopes naturally produce a curved focal plane, which results in slightly elongated or bloated stars at the edges of an image. The RFL-4087 incorporates a dedicated flattener optic that precisely counteracts this curvature. The result is a uniformly flat field of view, critical for astrophotography with modern sensors.\u003c\/p\u003e\n\u003cp\u003eWhen you use this corrector, stars remain tight and round from the center of your image all the way to the corners. This optical correction allows you to use your entire sensor's real estate without having to crop away distorted stars, preserving the full expanse of your wide-field 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\u003eOptimized Throughput with Full Multi-Coatings\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the RFL-4087 reducer-flattener features Tele Vue's proprietary multi-layer anti-reflection coatings. These advanced coatings ensure that more than 99% of the incoming light passes through the corrector to your camera sensor. By minimizing internal reflections and ghosting, these coatings deliver a high-contrast image with deep black backgrounds and vibrant colors.\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\u003eAn Imaging Experience on the Andromeda Galaxy\u003c\/h3\u003e\n\u003cp\u003eUsing the RFL-4087 with a TV-102 on a 35mm sensor transforms your ability to capture large celestial showpieces. An object like the Andromeda Galaxy (M31) can be framed in its entirety, including its satellite galaxies M32 and M110. The f\/6.9 speed allows you to resolve the faint, subtle dust lanes spiraling out from Andromeda's core with shorter individual exposures.\u003c\/p\u003e\n\u003cp\u003eThe flattener ensures that the countless foreground stars of our own Milky Way appear as sharp points across the whole field, adding depth and clarity to the final image. This is the capability that moves your telescope from a visual instrument to a serious imaging tool.\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 Critical 60.98mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eThis corrector is designed to provide optimal performance when the camera sensor is placed at a distance of 60.98mm from the reducer's rear flange. this distance is easily achieved by attaching a Tele Vue Imaging System T adapter to the RFL-4087: CWT-2070 for\nCanon EOS or NWT-2073 for Nikon F, or our TRG-1072 Standard T-Ring Adapter followed by the T-Ring for the 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\u003eChoosing Your Imaging Path: RFL-4087 vs. NP101is\u003c\/h3\u003e\n\u003cp\u003eFor imagers considering a Tele Vue instrument, the choice often comes down to upgrading a TV-102 or investing in a dedicated astrograph like the NP101is.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue-102 with RFL-4087:\u003c\/strong\u003e This combination creates a highly capable f\/6.9 imaging system from an excellent visual telescope. It is a cost-effective pathway for current TV-102 owners to get into serious, flat-field astrophotography.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue NP101is:\u003c\/strong\u003e This is a premium, integrated solution. Its 4-element Petzval design provides a native flat field at a faster f\/5.4 without any external correctors. It represents a higher investment but offers ultimate performance and convenience for dedicated imagers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe RFL-4087 provides a bridge, allowing the legendary visual performance of the TV-102 to be fully realized in a photographic capacity.\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-flattener work with my non-Tele Vue telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis corrector is specifically designed for the Tele Vue-102's optical system, but can also work with any 800-1000mm focal length doublet refractor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I achieve the required 55mm back focus?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 55mm distance is measured from the rear flange of the reducer to your camera's sensor. A standard DSLR camera connected to a 42mm T-ring provides this exact spacing automatically. For dedicated astronomy cameras, you will need to use a combination of spacers to reach 55mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the RFL-4087 for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this accessory is designed exclusively for astrophotography. It changes the focal point of the telescope in a way that will prevent you from reaching focus with a standard eyepiece and diagonal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 2-inch filters with this reducer?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The front barrel of the reducer, which inserts into the focuser, is threaded for standard M48x0.75 filters, allowing you to easily add a light pollution or narrowband filter to your imaging 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 reducer for the NP101is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThey are completely different optical designs for different telescopes. The RFL-4087 is for the TV-102 doublet, while the NPR-2073 reducer is for the NP-series Petzval refractors. They are not interchangeable.\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 SKU\u003c\/td\u003e\n\u003ctd\u003eRFL-4087\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eReducer \/ Flattener\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReduction Factor\u003c\/td\u003e\n\u003ctd\u003e0.8x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack Focus\u003c\/td\u003e\n\u003ctd\u003e60.98mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e2.4\" TeleVue Imaging System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003e2.4\" TeleVue Imaging System\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003eNone\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\"\u003e0.8x Reducer-Flattener for 102 Scopes\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_Flattener_for_102mm_Scopes_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\/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":51223883677981,"sku":"TV-RFL-4087","price":624.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_0.8x_Reducer_Flattener_102_Scopes_1.jpg?v=1777515016","url":"https:\/\/davidastro.com\/fr\/products\/tele-vue-0-8x-reducer-flattener-for-102-scopes","provider":"David Astro","version":"1.0","type":"link"}