{"product_id":"tele-vue-nagler-t4-22mm-82-degree-eyepiece-2-inch","title":"Tele Vue Nagler T4 22mm 82° Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 22mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 82°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 2-inch\u003c\/li\u003e\n\u003cli\u003eEye Relief: 19mm\u003c\/li\u003e\n\u003cli\u003eField Stop Diameter: 31.1mm\u003c\/li\u003e\n\u003cli\u003eParacorr Type 2 Optimized\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 Deep-Sky Spacewalk: A 22mm Nagler Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Nagler T4 22mm 82° Eyepiece is a definitive low-power, wide-field eyepiece designed for observers seeking the most immersive views possible from their telescopes. It delivers a vast, corrected window on the universe that feels less like looking through an instrument and more like floating in space. For owners of Dobsonian reflectors, Schmidt-Cassegrains, and large refractors, the 22mm Nagler provides the perfect balance of magnification and true field for sweeping the Milky Way and framing large deep-sky objects.\u003c\/p\u003e\n\u003cp\u003eThis eyepiece isn't simply about providing a wide view; it's about ensuring that view is sharp, contrasty, and comfortable from edge to edge. Every element of its design, from the glass to the coatings to the mechanical housing, is engineered to remove distractions and connect you directly to the target. It's the eyepiece you reach for when you want to see an object in its full galactic context.\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 Nagler Type 4 Optical Engine\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 22mm Nagler is the Type 4 optical design, a sophisticated arrangement of high-index glass that corrects for aberrations like astigmatism and field curvature. This means stars remain sharp points not just in the center, but across the entire expansive 82° field. The result is a flat, distortion-free canvas that allows you to explore the full view without chasing focus or losing detail at the periphery.\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 82° Apparent Field of View\u003c\/h3\u003e\n\u003cp\u003eThe 82° apparent field of view is the signature of the Nagler design, creating the famous \"spacewalk\" effect. This is not a gimmick. By filling your peripheral vision, the eyepiece removes the sense of a boundary, allowing your eye to relax and scan the starfield naturally. When viewing the Veil Nebula or the Andromeda Galaxy, this immersive presentation lets you trace faint structures and outlying star clusters in a single, cohesive view.\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\u003eEvery glass-to-air surface in the 22mm Nagler T4 receives multiple layers of anti-reflective coatings. This meticulous process maximizes light transmission, which is critical for observing faint deep-sky objects. The direct visual benefit is a darker sky background and enhanced contrast, allowing the delicate tendrils of nebulosity and the faint arms of galaxies to stand out against the void.\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\u003eComfortable Viewing with the Insta-just Eyeguard\u003c\/h3\u003e\n\u003cp\u003eA generous 19mm of eye relief makes the 22mm Nagler comfortable for all observers, including those who wear eyeglasses. To make this long eye relief perfectly usable, Tele Vue developed the Insta-just eyeguard. This click-stop mechanism lets you instantly set and lock the eyeguard height, ensuring your eye is positioned at the ideal distance to see the full field of view without blackouts or stray light interference, night after 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\u003eOptimized for Fast Reflectors with Paracorr\u003c\/h3\u003e\n\u003cp\u003eThe Nagler T4 design is specifically engineered to work as a system with the Tele Vue Paracorr Type 2 coma corrector. Owners of fast Newtonians and Dobsonians (f\/5 or faster) can achieve tack-sharp stars across the entire 82° field, correcting the coma inherent in their telescope's optics. This synergy turns a fast reflector into an uncompromising wide-field instrument, delivering views that are as sharp at the edge as they are in the center.\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\u003eRobust Mechanical Design and Safety\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece is built for a lifetime of use in the field. A textured rubber grip ensures secure handling, even with gloves on, while the 2-inch barrel features a machined undercut, or safety kerf. This groove gives your focuser's set screw a positive lock, significantly reducing the risk of the heavy eyepiece accidentally slipping out and falling.\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 Window on the Cygnus Loop\u003c\/h3\u003e\n\u003cp\u003eIn a 12-inch f\/5 Dobsonian with a quality O-III filter, the 22mm Nagler T4 transforms the Cygnus Loop. At this focal length, the magnification is low enough to frame either the Eastern or Western Veil in its entirety. As your eye adapts, the nebula resolves from a ghostly arc into a complex, three-dimensional network of filaments. The sharp, wide field allows you to follow the delicate, intertwined strands against a dark background, providing a sense of scale and structure that higher magnifications miss.\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\u003eConsiderations and Trade-Offs\u003c\/h3\u003e\n\u003cp\u003eThe optical performance of the 22mm Nagler T4 is accompanied by significant size and weight. Observers using smaller equatorial mounts will need to ensure their system is properly counterbalanced. Furthermore, while the eyepiece performs well in any telescope, achieving its full potential in reflectors faster than f\/6 requires pairing it with a Paracorr, which represents an additional investment in the 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\u003eChoosing Your Wide-Field Nagler\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue Nagler family offers several options for immersive, low-power viewing. The 22mm T4 occupies a crucial sweet spot.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 16mm T5:\u003c\/strong\u003e The 16mm provides a step up in magnification and a darker sky background, making it a better choice for resolving detail in smaller galaxies or planetary nebulae. The 22mm T4 offers a wider true field of view, making it the superior choice for scanning and observing very large objects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 31mm T5:\u003c\/strong\u003e The 31mm is the ultimate low-power eyepiece, delivering the widest possible true field in the 82° series. However, it is substantially larger, heavier, and more expensive. The 22mm T4 provides a similarly immersive experience in a more manageable and affordable package, making it a more practical choice for many observers and telescope systems.\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 the 22mm Nagler T4?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIf your telescope is a Newtonian or Dobsonian reflector with a focal ratio of f\/5 or faster, using a Paracorr Type 2 is highly recommended. It will correct the coma inherent in the telescope, ensuring stars are pinpoint sharp across the entire 82° field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 22mm Nagler a good choice for an SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice for Schmidt-Cassegrain and Maksutov-Cassegrain telescopes. It will provide a wide true field of view at low magnification, which is ideal for locating objects and observing large star clusters and nebulae that would otherwise not fit in the view of a shorter focal length eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 22mm Nagler T4 compare to the 17mm Nagler T4?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 22mm Nagler provides lower magnification and a wider true field of view, making it better for large, diffuse objects like the North America Nebula. The 17mm Nagler offers higher magnification, which helps to darken the sky background and provides more resolution for smaller objects like the Ring Nebula or globular clusters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"Type 4\" mean in the Nagler series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe \"Type\" number indicates a specific optical and mechanical design generation within the Nagler series. The Type 4 eyepieces are known for their long eye relief and inclusion of the Insta-just adjustable eyeguard, making them particularly comfortable for all observers, including those who wear glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 19mm eye relief on the Nagler T4 comfortable with glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 19mm of eye relief is very generous and is specifically designed to allow most eyeglass wearers to see the entire 82° field of view comfortably. The adjustable eyeguard helps you find the perfect distance for your specific glasses.\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\u003eTV-EN4-22.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e22mm\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\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e19mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e31.1mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.2 lbs (1 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e5.25\" x 2.7\" dia.\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 T4 22mm 82° 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_4_22mm_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\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223879090461,"sku":"TV-EN4-22.0","price":771.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Nagler_T4_22mm_Eyepiece_1.jpg?v=1777515025","url":"https:\/\/davidastro.com\/products\/tele-vue-nagler-t4-22mm-82-degree-eyepiece-2-inch","provider":"David Astro","version":"1.0","type":"link"}