{"product_id":"tele-vue-nagler-t7-9mm-82-degree-eyepiece","title":"Tele Vue Nagler T7 9mm 82° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 9mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 82°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eEye Relief: 12mm\u003c\/li\u003e\n\u003cli\u003eOptical Design: Nagler Type 7\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\u003eThe Spacewalk Experience in a 1.25\" Barrel\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Nagler T7 9mm 82° Eyepiece is a high-magnification, wide-field eyepiece designed to deliver an immersive \"spacewalk\" viewing experience in any telescope. It renders a sharp, expansive 82° apparent field of view that feels like looking through a porthole into space, but in a compact 1.25\" barrel format that is compatible with virtually any instrument. This eyepiece is for the observer who wants the signature Nagler wide-field view for resolving globular clusters, planetary nebulae, and lunar details without needing a 2\" focuser.\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 82° Nagler Apparent Field\u003c\/h3\u003e\n\u003cp\u003eThe defining feature of any Nagler eyepiece is the 82° apparent field of view. This creates a viewing window so large that the edge of the field is often not visible without intentionally moving your eye. The effect is a fully immersive experience where the telescope seems to disappear, leaving you suspended over the target.\u003c\/p\u003e\n\u003cp\u003eOn a target like the Orion Nebula (M42), the 9mm focal length provides enough magnification to resolve the Trapezium stars into sharp points, while the wide field simultaneously frames the surrounding nebulosity. This combination of power and field width allows you to study fine details within a grander context, a capability that narrower-field eyepieces cannot provide.\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\u003eHigh-Contrast, High-Transmission Optics\u003c\/h3\u003e\n\u003cp\u003eTele Vue uses high-index glass elements and applies full multi-coatings to every air-to-glass surface. This maximizes light throughput and minimizes internal reflections, which is critical for a high-magnification eyepiece. The direct visual benefit is a brighter image with higher contrast, allowing you to see fainter stars and more subtle details in nebulae and galaxies.\u003c\/p\u003e\n\u003cp\u003eWhen observing a bright object like Jupiter, the disciplined optical design ensures that light scatter is controlled. This results in a dark background sky right up to the planet's limb, making it easier to see delicate cloud bands and the Galilean moons without being washed out by glare.\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 for Fast Newtonian Reflectors\u003c\/h3\u003e\n\u003cp\u003eWhile the Nagler T7 9mm performs well in any telescope, it is optically conjugate to Tele Vue's Paracorr coma corrector. This means it is specifically designed to deliver sharp, pinpoint stars to the edge of the field even in \"fast\" f\/4 or f\/5 Newtonian reflectors, which are notoriously demanding on eyepieces. Observers with Dobsonian telescopes will find this eyepiece corrects for coma, delivering a flat, sharp field that makes tracking objects by hand more forgiving.\u003c\/p\u003e\n\u003cp\u003eThe primary trade-off for this exceptional wide-field performance is eye relief. At 12mm, it is sufficient for most observers, but those who must wear thick eyeglasses for astigmatism may not be able to see the entire 82° field at once. This is a deliberate design choice to achieve the compact size and sharp-to-the-edge performance.\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 Versatile 1.25\" Barrel Format\u003c\/h3\u003e\n\u003cp\u003eThe Nagler T7 9mm uses a standard 1.25\" barrel, making it a universal fit for the vast majority of telescopes. This format offers significant practical advantages. It is lighter than 2\" eyepieces, which helps with telescope balance, and it can be used in binoviewers for a three-dimensional observing experience that is simply not possible with larger eyepieces.\u003c\/p\u003e\n\u003cp\u003eThis makes the 9mm Nagler an excellent choice for smaller, high-quality refractors where a 2\" diagonal might be too heavy or cumbersome. It delivers the signature Nagler experience without requiring a large and heavy optical train.\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\u003eErgonomics and Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eThe 12mm of eye relief is managed by a soft, fold-down rubber eyeguard. This helps the observer maintain the correct eye position to see the full field of view and blocks stray light from the side, which improves perceived contrast during deep-sky observation. The barrel features a safety undercut to prevent the eyepiece from accidentally slipping out of the focuser if a thumbscrew comes loose.\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 Nagler Eyepiece\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several Nagler eyepieces, and selecting the right one depends on your telescope and observing goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNagler T7 9mm (This Model):\u003c\/strong\u003e The all-around high-power choice in the 1.25\" format. It offers a balance of magnification for resolving details in globular clusters and planetary nebulae while maintaining the immersive 82° field. It is the go-to for Dobsonian owners seeking a premium, wide-field planetary and deep-sky eyepiece.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNagler T6 7mm:\u003c\/strong\u003e For when you need more power. The 7mm provides higher magnification for splitting tight double stars or examining details in smaller planetary nebulae. You trade a bit of brightness for a larger image scale, making it ideal for nights of excellent seeing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNagler T4 22mm (2\"):\u003c\/strong\u003e This is a low-power, 2\" format eyepiece for sweeping large star fields and framing entire nebulae. It provides the same 82° experience but at a much lower magnification, serving as a \"finder\" eyepiece in large telescopes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cli\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Nagler 9mm work well with my f\/5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent match. The Nagler design is well-corrected for fast optics. For the sharpest possible views across the entire field, it is recommended to use it with a Tele Vue Paracorr coma corrector.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the 9mm Nagler with eyeglasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 12mm of eye relief is on the shorter side. While some users with glasses can see most of the field, those with thick lenses for astigmatism may not be able to see the full 82° view. For more comfortable viewing with glasses, consider the Tele Vue Delos line, which offers 20mm of eye relief.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Nagler T7 compare to the older Nagler T6 9mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Type 7 is a newer design that is slightly smaller and lighter than the Type 6. Optically, performance is very similar, with both providing exceptional sharpness and contrast. The main difference is in the physical form factor.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs this a good eyepiece for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. While it's known for deep-sky, the 9mm Nagler provides high-contrast, sharp views of planets like Jupiter and Saturn. The 82° field gives you a wide, dark background that makes the planet appear to float in space.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main benefit of the 82° field of view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 82° field creates an immersive \"spacewalk\" effect where the eyepiece seems to disappear. For non-driven telescopes like Dobsonians, it also means an object stays in the field of view for a longer time before you need to nudge the scope.\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\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eEN7-09.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e82°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e12mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e7.2 oz (0.45 lbs \/ 204 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e12.4mm\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 Nagler T7 9mm Eyepiece\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_Nagler_Type_7_9mm_Eyepiece_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\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879483677,"sku":"TV-EN7-09.0","price":958.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Nagler_T7_9mm_Eyepiece_1.jpg?v=1777515026","url":"https:\/\/davidastro.com\/fr\/products\/tele-vue-nagler-t7-9mm-82-degree-eyepiece","provider":"David Astro","version":"1.0","type":"link"}