{"title":"TeleVue Field Flatteners, Reducers \u0026 Coma Correctors","description":"\u003cp\u003eTeleVue field flatteners, reducers and coma correctors are optical correctors designed to match TeleVue telescopes and fast Newtonians. Reducers include the 0.8x Focal Reducer, the 0.8x Reducer-Flattener for 102 scopes and the 0.8x Reducer for NP scopes.\u003c\/p\u003e\u003cp\u003eThe Large Field Corrector covers larger sensors on the NP101, NP101is and NP127is. For Newtonians, the Paracorr Type 2 and Big Paracorr Type 2 correct coma, with a Tunable Top and 1.25\" adapter available.\u003c\/p\u003e","products":[{"product_id":"tele-vue-paracorr-type-2","title":"Tele Vue Paracorr Type 2","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects Coma in Fast Newtonian Reflectors\u003c\/li\u003e\n\u003cli\u003eFor f-ratios as fast as f\/3\u003c\/li\u003e\n\u003cli\u003e1.15x Magnification Factor\u003c\/li\u003e\n\u003cli\u003eAdjustable \"Tunable Top\" for Eyepiece Optimization\u003c\/li\u003e\n\u003cli\u003e4-Element, Multi-Coated Optics\u003c\/li\u003e\n\u003cli\u003e2-inch Barrel with Filter Threads\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\u003eManual\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\u003ePinpoint Stars to the Edge of Your View\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Paracorr Type 2 is a universal coma corrector for fast Newtonian reflectors, designed to transform distorted, comet-shaped stars at the edge of the field into sharp, clean points. By inserting this device into your 2-inch focuser, you enable your fast-focal-ratio mirror to deliver the wide, sharp fields it was designed to produce, effectively upgrading the performance of your entire optical 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\u003eThe Physics of a Perfect Starfield\u003c\/h3\u003e\n\u003cp\u003eOwners of fast Dobsonians and imaging Newtonians (typically f\/5 or faster) are familiar with coma, an inherent optical aberration where off-axis stars appear as distracting, comet-like flares. The Paracorr Type 2 employs a specialized 4-element, multi-coated lens system that intercepts and reshapes the telescope's converging light cone. This correction restores aberrated stars to the pinpoint dots you see at the center of the field, allowing you to experience the full, immersive potential of your wide-field eyepieces.\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\u003eOptimize for Every Eyepiece with the Tunable Top\u003c\/h3\u003e\n\u003cp\u003eNot all eyepieces are built alike; the location of their field stop varies by design and focal length. The Paracorr's ingenious \"Tunable Top\" is the key to universal compatibility. This adjustable mechanism lets you dial in the precise spacing between the Paracorr's lenses and your eyepiece's focal plane, ensuring the correction is perfectly optimized for any 1.25-inch or 2-inch eyepiece you own. The result is consistently sharp performance across your entire collection, from a low-power Nagler to a high-power Delos.\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 1.15x Magnification Trade-Off\u003c\/h3\u003e\n\u003cp\u003eTo achieve its level of correction, the Paracorr Type 2 introduces a minor, 1.15x increase to your telescope's magnification and focal length. This is a fundamental part of the optical design and a necessary trade-off for eliminating coma. This slight power increase also darkens the sky background, which can improve contrast on faint deep-sky objects like galactic dust lanes and the outer wisps of nebulae, often making the trade-off a net benefit for visual observers.\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 Critical Tool for Visual and Imaging Setups\u003c\/h3\u003e\n\u003cp\u003eThe Paracorr Type 2 is engineered for both the human eye and the camera sensor. For visual observers, it delivers expansive, \"spacewalk\" views where star clusters resolve into glittering dust across the entire field. For astrophotographers using sensors up to APS-C size, it produces a flat, corrected field essential for creating professional-quality images. By removing the Tunable Top, the Paracorr connects to standard imaging adapters to achieve the 55mm back focus common to most 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\u003eSeamless Integration Into Your Workflow\u003c\/h3\u003e\n\u003cp\u003eDesigned for practical use in the field, the Paracorr Type 2 slides into any standard 2-inch focuser and features a non-marring brass clamp ring to secure your eyepieces. The barrel is threaded to accept standard 2-inch filters, a significant convenience that allows you to add a nebula or light pollution filter to the corrector itself. This means you can switch eyepieces without having to thread and unthread your filter each time, saving valuable time under dark skies.\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 View from an f\/4 Dobsonian\u003c\/h3\u003e\n\u003cp\u003eCenter the Andromeda Galaxy in a wide-field eyepiece with an f\/4 Newtonian, and the core is brilliant. But without correction, the outer star fields dissolve into a swirl of seagull-shaped stars. Now, add the Paracorr. As your eye adapts, the view transforms. The outer third of the field snaps into focus, revealing countless individual stars in M32 and NGC 205 as sharp, distinct points. The experience is no longer just about the galaxy's core, but about its full, majestic context in a perfectly rendered starfield.\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 Paracorr: Type 2 vs. Big Paracorr\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers two main Paracorr models, and the choice is determined by your telescope's hardware and intended use.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eParacorr Type 2 (this model):\u003c\/strong\u003e This is the standard for visual observers and imagers using telescopes with 2-inch focusers. It provides excellent correction for eyepieces and camera sensors up to APS-C format (approx. 30mm diagonal). If your scope has a 2-inch focuser, this is the correct choice.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBig Paracorr Type 2:\u003c\/strong\u003e This model is designed for large, professional-grade instruments with 3-inch focusers. It offers a larger corrected field to illuminate full-frame sensors (43mm diagonal) and beyond. The Big Paracorr is the right choice only if you have a 3-inch or larger focuser and are using very large imaging sensors.\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 Paracorr for my f\/6 or f\/8 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. Coma becomes visually apparent in telescopes faster than f\/6. For f\/6 and slower systems, the effect is typically minimal and a coma corrector is not necessary for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Paracorr Type 2 work with all my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, that is the purpose of the \"Tunable Top.\" By adjusting the height setting according to the included chart, you can optimize the Paracorr's performance for virtually any 1.25\" or 2\" eyepiece, from Plössls to ultra-wide Naglers and Ethos.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 1.15x magnification affect my views?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou must account for it when calculating magnification. For example, a 10mm eyepiece in a 1000mm focal length telescope normally yields 100x. With the Paracorr, the effective focal length becomes 1150mm (1000 x 1.15), yielding 115x. This also slightly darkens the sky background, which can enhance contrast on faint objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Paracorr Type 2 good for astrophotography?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is excellent for imaging with fast Newtonians. It provides a well-corrected field for camera sensors up to APS-C size. For full-frame sensors, the Big Paracorr Type 2 is recommended to avoid vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to re-focus after inserting the Paracorr?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The Paracorr slightly changes the focal point of the telescope, requiring minor re-focusing. It is designed to minimize the change, but some adjustment will be needed.\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 Paracorr Type 1 and Type 2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Type 2 is a more advanced design that offers better correction, especially at very fast f-ratios like f\/3 and f\/3.5. It also features the Tunable Top for better eyepiece optimization, which the original Type 1 lacked.\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 Number\u003c\/td\u003e\n\u003ctd\u003eVIP-2010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eComa Corrector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e1.15x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e4 elements, multi-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eNewtonian reflectors down to f\/3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.1 lbs \/ 17.6 oz \/ 499g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e4.25\" \/ 108mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Support\u003c\/td\u003e\n\u003ctd\u003eThreads for 2-inch filters\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\"\u003eTele Vue Paracorr Type 2 Coma Corrector\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\" Eyepiece 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\"\u003eEyepiece Dust 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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eBarrel Dust 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_Paracorr_Type_2_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":51223879614749,"sku":"TV-VIP-2010","price":808.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Paracorr_Type_2_1.jpg?v=1777515028"},{"product_id":"tele-vue-big-paracorr-type-2","title":"Tele Vue Big Paracorr Type 2","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects Coma in Newtonian Reflectors\u003c\/li\u003e\n\u003cli\u003eFor f\/3 to f\/6 Parabolic Mirrors\u003c\/li\u003e\n\u003cli\u003e1.15x Magnification Factor\u003c\/li\u003e\n\u003cli\u003eDesigned for 3-inch Focusers\u003c\/li\u003e\n\u003cli\u003ePrevents Vignetting on Large Sensors\u003c\/li\u003e\n\u003cli\u003eAdjustable \"Tunable Top\" for Optimization\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\u003eManual\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\u003ePinpoint Stars to the Edge of Full-Frame Sensors\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Big Paracorr Type 2 is a specialized optical corrector designed to solve one fundamental problem: the comatic aberration inherent in fast Newtonian reflectors. For astro-imagers using large sensors or visual observers with ultra-wide eyepieces, this device transforms distorted, comet-shaped stars at the edge of the field into sharp, round pinpoints, effectively making your mirror's full potential visible 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\u003eThe Physics of a Flawless Field\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Big Paracorr is a multi-element, high-index glass optical system engineered to counteract the physics of a parabolic mirror. Mirrors faster than f\/6 naturally produce coma, an aberration that elongates stars as you move away from the central axis. The Paracorr's lenses introduce an equal but opposite correction, ensuring light rays from across the entire field come to a sharp, symmetrical focus on your camera sensor or at the eyepiece.\u003c\/p\u003e\n\u003cp\u003eThe visual result is a radical improvement in edge-of-field performance. On a full-frame image of a dense star field like the Perseus Double Cluster, stars that would appear as distracting seagulls or crescents become tight, point-like sources. This allows you to use the entire frame for your composition, no longer needing to crop away the distorted outer third of your 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\u003eEngineered for Large-Format Illumination\u003c\/h3\u003e\n\u003cp\u003eThe \"Big\" in Big Paracorr is a direct reference to its 3-inch barrel format. This larger diameter is not for vanity; it is a mechanical necessity for illuminating sensors with diagonals of 43mm (full-frame) or larger without vignetting. A standard 2-inch corrector would cause the image brightness to fall off dramatically in the corners of a large sensor, but the Big Paracorr's wide body and oversized lenses provide an even, un-clipped light cone.\u003c\/p\u003e\n\u003cp\u003eThis makes it the right choice for imagers who have invested in full-frame DSLR, mirrorless, or dedicated astronomy cameras. It ensures that your flat frames are correcting for minor dust and gradients, not for a fundamental vignetting issue caused by an undersized corrector. The result is higher signal-to-noise in the corners and a more uniform final 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\u003eDialing in Perfection with the Tunable Top\u003c\/h3\u003e\n\u003cp\u003eOptimal coma correction depends on the precise distance between the Paracorr's lenses and the focal plane. The Big Paracorr's \"Tunable Top\" is a calibrated, adjustable mechanism that lets you dial in this exact distance for your specific eyepiece or camera. By simply loosening a collar and rotating the top, you can match the setting to your equipment, ensuring the best possible correction.\u003c\/p\u003e\n\u003cp\u003eThis eliminates guesswork and provides a repeatable, optimized setup. For an imager, it means you can set the back focus correctly for your specific camera and filter wheel combination. For a visual observer switching between different eyepieces, it allows for quick tweaks to maintain edge-to-edge sharpness across your entire collection.\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\u003eMore Than a Corrector: The 1.15x Magnification Factor\u003c\/h3\u003e\n\u003cp\u003eThe Paracorr's design includes a slight 1.15x magnification factor. This is an integral part of how the 4-element lens system achieves its correction and should not be mistaken for a simple Barlow effect. This minor focal length increase has a secondary benefit: it slightly darkens the sky background, which can increase the contrast on faint, extended objects like galaxies and nebulae.\u003c\/p\u003e\n\u003cp\u003eThis also means your f\/4 mirror performs like an f\/4.6 system, which can make collimation slightly more forgiving. It’s a subtle but meaningful characteristic that contributes to the overall quality of the final view or image, turning your fast, wide-field instrument into a perfectly corrected, high-contrast 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\u003eSecure Connections for Heavy Payloads\u003c\/h3\u003e\n\u003cp\u003eRecognizing that large-format imaging involves heavy camera trains, the Big Paracorr uses threaded connections instead of simple compression rings. The back of the unit provides a 3.40\" x 24 TPI flange for attaching robust, dedicated camera adapters. This prevents any tilt or flexure that could compromise the optical correction, a critical factor when dealing with the tight tolerances of a fast optical system.\u003c\/p\u003e\n\u003cp\u003eThe primary limitation of the Big Paracorr is its requirement for a robust, 3-inch focuser and a mount capable of handling the entire imaging payload. It is a serious piece of hardware for those who require the highest level of performance from their large-aperture Newtonian.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch3\u003eChoosing Your Paracorr: Big vs. Standard Type 2\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers two versions of the Paracorr Type 2, and the choice is dictated by your equipment and goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBig Paracorr Type 2 (this model):\u003c\/strong\u003e This is the definitive choice for imagers using sensors with a diagonal larger than 30mm (i.e., APS-C and full-frame) or visual observers using the widest 2-inch eyepieces like the Tele Vue 31mm Nagler or 21mm Ethos. It requires a 3-inch focuser to deliver its vignette-free performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParacorr Type 2 (VIP-2010):\u003c\/strong\u003e The standard 2-inch model is optically identical and provides the same level of coma correction. It is the ideal choice for telescopes with 2-inch focusers, for visual use with most eyepieces, and for imaging with cameras that have APS-C or smaller sensors.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf your system can accommodate it, the Big Paracorr provides the ultimate, uncompromised illumination for the largest formats. If you use a 2-inch focuser, the standard Paracorr Type 2 delivers the same world-class coma correction in a smaller package.\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 the Big Paracorr or the standard 2-inch Paracorr Type 2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eChoose the Big Paracorr if you have a 3-inch focuser and use a full-frame (43mm diagonal) or larger imaging sensor. For telescopes with 2-inch focusers or if you primarily use smaller sensors (APS-C or smaller), the standard 2-inch Paracorr Type 2 is the correct choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Big Paracorr work visually with my 2-inch eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will need a 3-inch to 2-inch adapter to place your eyepiece in the Paracorr's tunable top. It is particularly effective with ultra-wide 2-inch eyepieces that can take advantage of the large, fully illuminated field it provides.\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 \"Tunable Top\" position for my camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTele Vue provides charts and adapters for various camera systems. The goal is to set the Paracorr's lens-to-sensor distance to a specific value (typically around 80mm from the rear thread shoulder). You use a combination of the tunable top setting and appropriate spacers to achieve this distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the 1.15x magnification change my f\/ratio?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it effectively multiplies your telescope's focal ratio by 1.15. For example, an f\/4 telescope will perform like an f\/4.6 system with the Paracorr. This is an integral part of the optical design that achieves the coma correction.\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 the Big Paracorr?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but you will need a camera adapter that has M48 (2-inch) filter threads. The Paracorr itself does not have filter threads on the eyepiece\/camera side, but compatible adapters from Tele Vue and other manufacturers do.\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 Number\u003c\/td\u003e\n\u003ctd\u003eVIP-3010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e3-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e1.15x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptimal Mirror f\/ratio\u003c\/td\u003e\n\u003ctd\u003ef\/3 to f\/6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Side Connection\u003c\/td\u003e\n\u003ctd\u003e3-inch Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera\/Eyepiece Side Connection\u003c\/td\u003e\n\u003ctd\u003e3.40\" x 24 TPI Flange (80mm back focus)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.5 lbs (0.68 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e5.125 inches (130 mm)\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 Big Paracorr Type 2\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TV-VIP-3010_1.jpg?v=1794301550\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue Big Paracorr Type 2\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 3-inch Dust Cap\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-3inch-Dustcap.jpg?v=1794301666\"\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\/files\/TeleVue-Dust-Cap-Bottom.jpg?v=1794301740\"\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_Big_Paracorr_Type_2_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":51223879647517,"sku":"TV-VIP-3010","price":1754.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Big_Paracorr_Type_2_1.jpg?v=1777515019"},{"product_id":"tele-vue-tunable-top-with-adapter","title":"Tele Vue Tunable Top with 1.25\" Adapter","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eEnables precise coma correction for Tele Vue Paracorr Type 2\u003c\/li\u003e\n\u003cli\u003eContinuously adjustable with a lock screw\u003c\/li\u003e\n\u003cli\u003eEngraved millimeter scale for repeatable eyepiece settings\u003c\/li\u003e\n\u003cli\u003eNon-marring brass clamp ring secures 1.25\" accessories\u003c\/li\u003e\n\u003cli\u003eAccepts standard 1.25\" eyepiece filters\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\u003eUnlock Pinpoint Stars to the Edge with Your Paracorr\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eTele Vue Tunable Top with adapter - 1.25\" (ATT-2125)\u003c\/strong\u003e is the essential control center for extracting maximum performance from your Paracorr Type 2 coma corrector and fast Newtonian telescope. This precision component replaces the standard eyepiece holder, giving you micro-adjustable control over the critical lens-to-focal-plane distance. Achieving this perfect spacing is the key to transforming comatic stars at the edge of the field into sharp, pinpoint dots, unlocking the full potential of your optical 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\u003eThe Heart of Coma Correction: The Micro-Adjustable Mechanism\u003c\/h3\u003e\n\u003cp\u003eA Paracorr's performance is entirely dependent on the precise distance between its lenses and your eyepiece's focal plane. The Tunable Top's helical mechanism allows you to dial in this distance with exacting precision. As you twist the upper section, it smoothly extends or retracts, changing the spacing without rotating the eyepiece, so your target remains perfectly framed.\u003c\/p\u003e\n\u003cp\u003eThis fine control is not a \"set and forget\" feature. Every eyepiece design has a unique focal plane position. This device empowers you to find the specific sweet spot for each eyepiece in your collection, ensuring that whether you are using a Plössl or a wide-field Nagler, you are achieving the highest level of coma correction the Paracorr can deliver.\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\u003eRepeatable Performance with the Engraved Reference Scale\u003c\/h3\u003e\n\u003cp\u003eFinding the perfect setting for an eyepiece is only half the battle. The Tunable Top features a clearly laser-engraved millimeter scale on its body, allowing you to note and record the optimal position for each of your 1.25\" eyepieces. This simple but critical feature eliminates guesswork during your observing sessions.\u003c\/p\u003e\n\u003cp\u003eOnce you chart your eyepieces, you can switch between them in the dark with confidence, quickly dialing the Tunable Top to the predetermined mark for each one. This workflow saves precious observing time and guarantees you are getting the same sharp, edge-corrected views every single time you insert that eyepiece.\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 and Safe Mounting with a Brass Clamp Ring\u003c\/h3\u003e\n\u003cp\u003eStandard set screws can mar the barrels of your expensive eyepieces, leaving unsightly and potentially damaging gouges. The Tele Vue Tunable Top incorporates a non-marring brass clamp ring. When you tighten the lock screw, this internal ring compresses gently and evenly around the eyepiece barrel.\u003c\/p\u003e\n\u003cp\u003eThis design provides a more secure, concentric grip than a single screw, preventing eyepiece tilt that can degrade optical performance. Most importantly, it protects your investment, ensuring the barrels of your eyepieces remain in pristine condition no matter how many times you use them.\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\u003eSeamless Integration with the Paracorr Type-2 Interface\u003c\/h3\u003e\n\u003cp\u003eThis Tunable Top is designed specifically for the Tele Vue Paracorr Type 2, ensuring a perfect, rigid fit. It threads directly onto the main optical body of the Paracorr, creating a solid, flex-free connection that becomes an integral part of the optical train. This robust mechanical link is critical for maintaining optical alignment, especially when using heavier eyepieces or 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\u003eAdd Contrast with Integrated 1.25\" Filter Threads\u003c\/h3\u003e\n\u003cp\u003eConveniently located at the base of the eyepiece barrel holder are standard M28.5x0.6 threads. This allows you to attach any 1.25\" filter, such as a nebula or light pollution filter, directly to the Tunable Top. Placing the filter here, before the eyepiece, ensures it is a permanent part of your Paracorr setup, simplifying your workflow when you switch eyepieces.\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 Necessary Upgrade, Not a Luxury Accessory\u003c\/h3\u003e\n\u003cp\u003eFor the owner of a fast f\/3 to f\/5 Newtonian reflector, coma is the single greatest barrier to achieving wide-field views with sharp stars edge-to-edge. While the Paracorr Type 2 provides the optical correction, the Tunable Top provides the essential mechanical control to make that correction perfect for your specific eyepieces.\u003c\/p\u003e\n\u003cp\u003eWithout it, you are using the Paracorr at a generic setting that is a compromise for most eyepieces. The only genuine trade-off is the initial time spent calibrating your eyepiece collection. Once done, this tool transforms your observing from a series of optical compromises to a repeatable, optimized experience every night.\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 really need the Tunable Top for my Paracorr Type 2?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if you want to get the best possible performance. Every eyepiece model has a different optimal spacing. The Tunable Top is the only way to precisely set this distance and achieve the sharpest stars at the edge of the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I find the right setting for my eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTele Vue provides a chart with recommended initial settings for their eyepieces. For others, you can start there and make fine adjustments while looking at a star in the outer 20% of the field of view until the star becomes a tight, round point.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this work with the original Paracorr (Type 1)?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this model (ATT-2125) is designed specifically for the newer Paracorr Type 2. The original Paracorr has a different mechanical interface and requires a different tunable top model.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use this for imaging with a 1.25\" camera?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it works perfectly for cameras with a 1.25\" nosepiece. The tuning mechanism allows you to precisely set the 55mm back focus required for optimal correction on the camera's sensor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tunable Top rotate my eyepiece when I adjust it?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the design is non-rotating. The helical mechanism moves the eyepiece holder up and down without spinning it, so your camera orientation or preferred eyecup position remains fixed.\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 Number\u003c\/td\u003e\n\u003ctd\u003eATT-2125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eTele Vue Paracorr Type 2 (VIP-2010)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAccessory Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClamping Mechanism\u003c\/td\u003e\n\u003ctd\u003eBrass Compression Ring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eStandard 1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdjustment\u003c\/td\u003e\n\u003ctd\u003eHelical, non-rotating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScale\u003c\/td\u003e\n\u003ctd\u003eEngraved Millimeter Markings\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\"\u003eTele Vue 1.25\" Tunable Top for Paracorr Type 2\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\/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":51223879745821,"sku":"TV-ATT-2125","price":288.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Tunable_Top_1.jpg?v=1777515030"},{"product_id":"tele-vue-0-8x-focal-reducer","title":"Tele Vue 0.8x Focal Reducer","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eReduction Factor: 0.8x\u003c\/li\u003e\n\u003cli\u003eOptical Design: Reducer and Field Flattener\u003c\/li\u003e\n\u003cli\u003eTelescope Connection: 2-inch Barrel\u003c\/li\u003e\n\u003cli\u003eCamera Connection: M42x0.75 T-Ring Thread\u003c\/li\u003e\n\u003cli\u003eOptimal Back Focus: 56mm\u003c\/li\u003e\n\u003cli\u003eCompatible Telescopes: TV-76, TV-85 and other 400-600mm doublet refractors\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\u003eManuals\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 and Fainter Detail with Your Tele Vue Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue 0.8x Focal Reducer (TRF-2008) is an essential imaging accessory designed specifically to enhance the deep-sky performance of Tele Vue refractors. This optically matched reducer and field flattener shortens your telescope's effective focal length by 20%, creating a wider, faster imaging system. The result is a dramatic increase in field of view and a significant reduction in required exposure time, allowing you to capture expansive nebulae and faint galaxies with greater efficiency.\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 0.8x Reduction Advantage for Deep-Sky Imaging\u003c\/h3\u003e\n\u003cp\u003eThe core of the TRF-2008 is its 0.8x reduction lens assembly. By shortening your telescope's focal length, it also reduces the focal ratio. A 600mm f\/7.5 refractor, for example, becomes a 480mm f\/6 system. This \"faster\" optical system concentrates the same amount of light onto a smaller area of your camera sensor, reducing required exposure times by approximately 36%. This allows you to gather more data in a single night or capture fainter details without pushing your mount's tracking limits.\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 Across the Entire Frame\u003c\/h3\u003e\n\u003cp\u003eBeyond simple reduction, the TRF-2008 is a dedicated field flattener. Refracting telescopes naturally produce a curved focal plane, which can result in slightly elongated stars at the edges of an image. This reducer incorporates corrective optics that counteract this effect, ensuring that stars remain tight, round points from the center of your sensor to the corners. This is the mechanism that delivers sharp, professional-looking astrophotographs without the need for excessive cropping.\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\u003eSeamless Integration with Your Imaging Train\u003c\/h3\u003e\n\u003cp\u003eEngineered for a perfect fit, the TRF-2008 slides directly into any standard 2-inch focuser drawtube. The barrel is threaded to accept standard 48mm (2-inch) astronomy filters, allowing you to easily incorporate light pollution or narrowband filters into your setup without adding complex adapters. This thoughtful design simplifies your imaging train and maintains a secure, rigid connection between the telescope and 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\u003eStandard T-Ring Connection for Universal Camera Compatibility\u003c\/h3\u003e\n\u003cp\u003eThe camera side of the TRF-2008 features a male M42x0.75 T-thread, the universal standard for attaching imaging equipment. This allows you to connect virtually any DSLR or dedicated CMOS\/CCD astronomy camera using a standard T-ring. This direct, threaded connection is far more secure than set-screw or compression ring systems, preventing camera sag or tilt that can ruin a long exposure.\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 Role of 56mm Back Focus\u003c\/h3\u003e\n\u003cp\u003eFor the field-flattening optics to perform correctly, the distance from the reducer's rear flange to your camera's sensor must be 56mm (+\/-2mm). This is a critical specification, not a guideline. Most DSLRs with a standard T-ring naturally hit this spacing, but for dedicated astronomy cameras, you may need to use T-threaded extension tubes to achieve this precise distance. Nailing this back focus is the key to unlocking the reducer's 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\u003eMaximizing Light and Contrast with Multi-Coatings\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the TRF-2008 optical path is treated with Tele Vue's proprietary multi-coatings. These advanced coatings are designed to maximize light transmission, ensuring that the faint light from distant galaxies and nebulae reaches your sensor. They also serve to suppress internal reflections, which would otherwise reduce image contrast and introduce ghosting artifacts on bright stars.\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\u003eDesigned for Tele Vue Refractors\u003c\/h3\u003e\n\u003cp\u003eIt is important to note that the TRF-2008's optical prescription is designed to flatten the field of doublet refractors of 400mm to 600mm focal length, such as the TV-76 and TV-85; Tele Vue states it can be used with any doublet in that range. It is not meant for the Petzval-design NP101is and NP127is, which use the NPR-2073 reducer instead.\u003c\/p\u003e\n\u003cp\u003eImagine framing the entirety of the Andromeda Galaxy. With a TV-85 at its native 600mm, you can capture the bright core, but the faint outer arms are often cropped. With the TRF-2008, the field expands to 480mm, perfectly framing the galaxy's full, majestic spiral structure. The faster f\/5.6 system also brings out the subtle details in the dust lanes with shorter sub-exposures, making the entire imaging process more productive and rewarding.\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 the Right Tele Vue Corrector\u003c\/h3\u003e\n\u003cp\u003eTele Vue makes several correctors, and choosing the right one depends entirely on your telescope type and goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTRF-2008 0.8x Reducer:\u003c\/strong\u003e This is the correct choice for astrophotography with doublet refractors having focal lengths between 400mm and 600mm. It provides both focal reduction and field flattening.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNPR-2073 0.8x Reducer:\u003c\/strong\u003e This reducer is designed specifically for the flat-field Nagler-Petzval optical design of the NP101is and NP127is telescopes. It will not properly flatten the field of a standard doublet refractor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eParacorr Type 2:\u003c\/strong\u003e This is not a refractor accessory. The Paracorr is a coma corrector designed exclusively for correcting the optics of fast Newtonian reflectors. It is essential for imaging with Newtonians but is not compatible with refractors.\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\"\u003eWill the TRF-2008 work with my non-Tele Vue refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, if it is a doublet refractor with a focal length between 400mm and 600mm. Tele Vue states the TRF-2008 can be used with any doublet in that range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat do I need to get the correct 56mm back focus spacing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA standard DSLR camera with a matching 10mm T-ring typically provides the correct 56mm spacing automatically. For dedicated astronomy cameras, you will need to check your camera's sensor depth and use M42 extension tubes to make up the difference.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the TRF-2008 for visual observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the TRF-2008 is designed exclusively for astrophotography. It does not have a provision for holding an eyepiece and will not reach focus for visual use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is this reducer not recommended for the Tele Vue NP101is or NP127is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe NP101is and NP127is telescopes have a built-in flattener (Petzval design) and a larger 2.4-inch focuser. The TRF-2008 would cause significant vignetting (darkening of the corners) on these scopes. They require the larger, dedicated NPR-2073 reducer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the TRF-2008 correct for chromatic aberration?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the reducer is not designed to correct for chromatic aberration (false color). That correction is the job of the telescope's main objective lens. The TRF-2008's purpose is to reduce the focal length and flatten the field.\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\u003eTRF-2008\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eFocal Reducer \/ Field 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\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e2-inch Barrel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eMale M42x0.75 T-Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e56mm ± 2mm from flange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Thread\u003c\/td\u003e\n\u003ctd\u003e48mm (for 2-inch filters)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClear Aperture\u003c\/td\u003e\n\u003ctd\u003e1.66\" (42mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e5.4 oz (153 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e1.8\" (46mm)\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 Focal Reducer \/ 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\"\u003eTop 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\"\u003eBottom 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\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_0.8x_Focal_Reducer_Flattener_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":51223881154845,"sku":"TV-TRF-2008","price":564.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_0.8x_Focal_Reducer_1.jpg?v=1777515015"},{"product_id":"tele-vue-large-field-corrector-np101-np101is-np127is","title":"Tele Vue Large Field Corrector- NP101-NP101is-NP127is","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eCorrects Field Curvature for Large Format Sensors\u003c\/li\u003e\n\u003cli\u003eDesigned for Tele Vue NP101, NP101is, and NP127is Telescopes\u003c\/li\u003e\n\u003cli\u003eFully Illuminates Sensors up to 52mm Diagonal\u003c\/li\u003e\n\u003cli\u003eSecure 2.4-inch Threaded Connection to Focuser\u003c\/li\u003e\n\u003cli\u003eRequires 84.6mm +\/- 1mm of Back Focus\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\u003eManual\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\u003eUnlock the Full Imaging Frame of Your NP Refractor\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Large Field Corrector (LCL-1069) is the definitive optical accessory for astrophotographers using NP101, NP101is, or NP127is telescopes who want to employ large-format camera sensors. This corrector is engineered to eliminate the final vestiges of field curvature inherent in the Petzval design, producing pinpoint stars across the entire diagonal of today's largest CCD, CMOS, and DSLR sensors.\u003c\/p\u003e\n\u003cp\u003eWhile the native NP optical design delivers a superb flat field for smaller sensors, scaling up to full-frame (43mm diagonal) or larger formats reveals subtle star elongation at the extreme edges. The Large Field Corrector is not a generic flattener; it is a dedicated optical system designed by Tele Vue to work in harmony with the NP-series' optics, ensuring the telescope's celebrated performance extends corner to corner on your largest imaging chips.\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 Two-Element Optical Corrector\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the LCL-1069 is a two-element, high-index glass optical system. Its sole purpose is to counteract the slight residual field curvature of the NP telescope's objective, ensuring the focal plane presented to your camera is perfectly flat. This means stars at the edge of a 50mm image circle are as round and sharp as the star dead-center.\u003c\/p\u003e\n\u003cp\u003eThis correction is critical when imaging wide star fields or large nebulae on a big sensor. Without it, you would be forced to crop your images to discard the soft stars in the corners, effectively wasting a significant portion of your camera's capability and your telescope's wide-field potential. The corrector ensures every pixel of your sensor is capturing data with maximum 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\u003eFull Illumination for Large Format Sensors\u003c\/h3\u003e\n\u003cp\u003eOptical correction is only half the battle; preventing vignetting is the other. The Large Field Corrector is mechanically and optically designed to pass the full, unobstructed light cone from the telescope's objective. This allows it to fully illuminate sensors with diagonals up to 52mm.\u003c\/p\u003e\n\u003cp\u003eThis avoids the dimming or \"tunnel vision\" effect at the corners of your images that occurs when the light path is constricted. For imagers using full-frame (24x36mm) or medium-format sensors, this means your flat frames will be easier to apply, resulting in a more uniform background and drawing more attention to the faint, extended details in your target.\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 Rigid 2.4-inch Threaded Interface\u003c\/h3\u003e\n\u003cp\u003eTo maintain perfect optical alignment, the corrector attaches directly to the NP focuser's drawtube via a large 2.4-inch thread. This rigid, direct-thread connection is a significant upgrade over compression-ring or set-screw based adapters. It completely eliminates the possibility of tilt, which is a primary cause of misshapen stars in one corner of an image.\u003c\/p\u003e\n\u003cp\u003eThis secure mounting ensures that the corrector, your camera, and any accessories in the imaging train are held perfectly orthogonal to the telescope's optical axis. This stability is essential during long exposures, especially on equatorial mounts where the instrument orientation changes throughout the night. It provides peace of mind that your optical train is a single, solid unit.\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\u003eAchieving Critical Back Focus Spacing\u003c\/h3\u003e\n\u003cp\u003eThis corrector's performance is entirely dependent on maintaining a precise distance between its rear flange and your camera's sensor plane. The required back focus is 84.6mm, with a tight tolerance of only +\/- 1mm. This is a deliberate design trade-off; achieving perfect edge correction requires this level of precision.\u003c\/p\u003e\n\u003cp\u003eTele Vue's Imaging System accessories, such as the Canon and Nikon Wide T-Adapters and various spacer tubes, are designed to achieve this distance with specific camera models. While this requires careful planning of your imaging train, it is the key that unlocks the corrector's full performance. The result of this precision is a truly flat field that lesser, more forgiving systems cannot match.\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 the Cygnus Loop with a Full-Frame Sensor\u003c\/h3\u003e\n\u003cp\u003eImagine framing the entirety of the Veil Nebula complex with your NP127is and a full-frame monochrome camera. Using the Large Field Corrector, the fine, thread-like filaments of NGC 6992 (the Eastern Veil) and the delicate shockwave of NGC 6960 (the Witch's Broom Nebula) are rendered with equal sharpness. The thousands of stars scattered across the field, from the brilliant 52 Cygni to the faintest background specks, remain perfect pinpoints right into the corners of the 36mm-wide frame.\u003c\/p\u003e\n\u003cp\u003eWithout the corrector, this same view would show those corner stars beginning to stretch, pulling your eye away from the delicate details of the nebula. The LCL-1069 makes the telescope's entire corrected image circle usable, transforming your instrument into a truly professional wide-field astrograph.\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 this corrector for visual use with my NP101is or NP127is?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this corrector is designed exclusively for astrophotography with large sensor cameras. The native optical design of the NP-series telescopes is already exceptionally well-corrected for visual observing with all Tele Vue eyepieces.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the LCL-1069 work with my Tele Vue TV-85 or TV-76 telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this corrector is specifically designed for the optical prescription and focuser of the NP101, NP101is, and NP127is models. For other Tele Vue refractors, you would use a different reducer or flattener, such as the TRF-2008 or RFL-4087.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I get the exact 84.6mm back focus spacing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eTele Vue produces a system of adapters and spacers specifically for this purpose. You will need to use a combination of Tele Vue's Wide T-adapters for your specific camera brand and their 2.4-inch accessory tubes to achieve the required distance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes this corrector change the focal length of my telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the Large Field Corrector is a 1.0x flattener. It does not reduce or increase the focal length or focal ratio of your telescope. Its function is purely to correct for residual field curvature.\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 corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. You can attach a 48mm (2-inch) filter to the Tele Vue Imaging System nosepiece (RAD-1074) or use a filter slider\/wheel in your imaging train, provided you can still meet the 84.6mm back focus requirement.\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\u003eLCL-1069\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eField Flattener for Astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMagnification Factor\u003c\/td\u003e\n\u003ctd\u003e1.0x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Telescopes\u003c\/td\u003e\n\u003ctd\u003eTele Vue NP101, NP101is, NP127is\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTelescope Connection\u003c\/td\u003e\n\u003ctd\u003e2.4-inch Female Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCamera Connection\u003c\/td\u003e\n\u003ctd\u003eTele Vue Imaging System Accessory Thread\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired Back Focus\u003c\/td\u003e\n\u003ctd\u003e84.6mm ± 1mm from rear flange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Illuminated Field\u003c\/td\u003e\n\u003ctd\u003e52mm diagonal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.75 lbs (340 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\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eLarge Field Corrector\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 Cap (Telescope Side)\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 Cap (Camera Side)\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_NP101is_Operating_Guide.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":51223883481373,"sku":"TV-LCL-1069","price":480.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Large_Field_Corrector_1.jpg?v=1777515025"},{"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"},{"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\/collections\/televue-field-flatteners-reducers-and-coma-correctors.oembed","provider":"David Astro","version":"1.0","type":"link"}