{"product_id":"tele-vue-nagler-t5-16mm-82-degree-eyepiece","title":"Tele Vue Nagler T5 16mm 82° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 16mm\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: 10mm\u003c\/li\u003e\n\u003cli\u003eField Stop: 17.4mm\u003c\/li\u003e\n\u003cli\u003eWeight: 0.45 lbs (204g)\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\/Downloads\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 View in a Compact Form Factor\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Nagler T5 16mm 82° Eyepiece delivers the signature, immersive \"spacewalk\" experience in a compact and lightweight 1.25\" format. This eyepiece is engineered for observers who demand expansive, sharp-to-the-edge views but are constrained by the size, weight, or focuser limitations of larger 2\" eyepieces. It represents a critical mid-power focal length, ideal for framing detailed globular clusters, planetary nebulae, and galaxy groups in a wide, dark field.\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\u003eNagler Type 5 Optical Design: Wide-Field Correction\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the 16mm Nagler is a 6-element optical design that manages the complex corrections required for an 82° apparent field. This design controls for aberrations like coma and astigmatism, which would otherwise stretch stars into unflattering shapes at the edge of the field in fast telescopes. The result is a flat, sharp field where stars remain tight points from the center to the edge, preserving the natural appearance of star clusters and rich fields.\u003c\/p\u003e\n\u003cp\u003eThis level of correction is what separates a Nagler from simpler wide-field designs. It ensures that the immersive quality of the view isn't compromised by distracting distortions. The observer's eye can relax and roam across the entire field, trusting that the view at the edge is as faithful as the view 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\u003eThe 82° Apparent Field of View Experience\u003c\/h3\u003e\n\u003cp\u003eThe 82° apparent field of view (AFOV) is the defining feature of the Nagler family. This geometry is so wide that the edge of the field is not immediately visible to the relaxed eye, creating the sensation of looking through a window into space rather than looking through an eyepiece. This effect makes objects feel suspended in a vast, black background, enhancing the context and scale of deep-sky targets.\u003c\/p\u003e\n\u003cp\u003eWith the 16mm focal length in a telescope with a 1200mm focal length, for example, the Ring Nebula (M57) is framed perfectly at 75x magnification. You see not just the nebula itself, but the surrounding star patterns and the faint foreground stars within the ring, all presented in a single, cohesive view that feels like a porthole on a spacecraft.\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\u003eMaximum Contrast from Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the Nagler T5 16mm receives a robust, multi-layer anti-reflective coating. This is not a trivial detail. These coatings are tuned to maximize light throughput at critical wavelengths and to suppress internal reflections that manifest as ghosting and flare, which can wash out faint detail.\u003c\/p\u003e\n\u003cp\u003eThe practical benefit is a view with higher contrast and darker sky backgrounds. Faint extensions on galaxies or delicate wisps of nebulosity stand out more clearly against the blackness of space. When observing a bright object like Jupiter, these coatings mean you see crisp detail in the cloud bands without a distracting halo of scattered light.\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\u003eComfort and Usability: Eye Relief and Mechanics\u003c\/h3\u003e\n\u003cp\u003eThe Nagler T5 series features a 10mm eye relief, which is a key trade-off for its compact size. While comfortable for many observers, it can be tight for those who must wear eyeglasses to correct for significant astigmatism. The adjustable rubber eyeguard helps you find the optimal eye position to see the full field of view and blocks stray light from the side, improving perceived contrast.\u003c\/p\u003e\n\u003cp\u003eThe physical construction is designed for confident handling in the dark. A textured rubber grip ring provides a secure hold, while the chrome-plated 1.25\" barrel resists wear and includes a safety undercut to prevent it from accidentally slipping out of the focuser. The barrel is also threaded to accept standard 1.25\" astronomy filters.\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\u003eParfocal Design for an Efficient Workflow\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece is designed to be nearly parfocal with other Tele Vue eyepieces in the 1.25\" family, such as Plössls, Panoptics, and Delos models. This means that when you switch from another eyepiece in this group to the 16mm Nagler, you will need to make only a minimal adjustment to the focuser. This is a significant workflow advantage during an observing session.\u003c\/p\u003e\n\u003cp\u003eThis design feature saves valuable time at the telescope, keeping your target centered and in near-focus as you change magnifications. This allows you to quickly compare views at different image scales without the frustrating process of having to completely re-acquire and refocus the object each time you swap 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\u003eChoosing Your Nagler: The 16mm T5 vs. Siblings\u003c\/h3\u003e\n\u003cp\u003eThe Nagler eyepiece family offers several choices, and selecting the right one depends on your telescope and observing goals.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 13mm T6:\u003c\/strong\u003e The 13mm T6 is even smaller and lighter, with a longer 12mm eye relief, making it slightly more comfortable for eyeglass wearers. The 16mm T5, however, provides a wider true field of view and a larger exit pupil, making it a better choice for framing larger objects or for use in telescopes with longer focal lengths.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 22mm T4 (2\"):\u003c\/strong\u003e The 22mm T4 is a 2\" eyepiece that delivers a significantly wider true field of view, making it a superior choice for sweeping large nebulae or finding objects. The 16mm T5 is the right choice when your telescope has a 1.25\" only focuser, or when you need the higher magnification and darker sky background it provides for resolving details in smaller targets.\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\"\u003eIs the 16mm Nagler T5 good for someone who wears glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 10mm eye relief is considered short for eyeglass wearers. While some may be able to see most of the field, those with significant astigmatism who cannot remove their glasses may find it difficult to see the full 82° view. For better eye relief, consider the Tele Vue Delos line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the best use for the 16mm Nagler T5 eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece excels at medium-power, wide-field views of deep-sky objects. It is ideal for resolving the cores of globular clusters like M13, framing medium-sized open clusters, and observing planetary nebulae and smaller galaxies with their surrounding star fields.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this eyepiece work well in my fast f\/4.5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, Nagler eyepieces are specifically designed to deliver sharp, well-corrected views in fast telescopes. A Paracorr Type 2 coma corrector is still recommended to achieve the sharpest possible stars across the entire field, but the eyepiece itself performs very well in fast systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the 16mm Nagler T5 compare to the 17.3mm Delos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 17.3mm Delos offers a smaller 72° apparent field but has a much more comfortable 20mm of eye relief, making it a better choice for eyeglass wearers. The Nagler T5 provides a more immersive, \"spacewalk\" feeling due to its wider 82° field, but at the cost of shorter eye relief.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for this eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt means the 16mm Nagler T5 requires little to no refocusing when you switch it with most other 1.25\" Tele Vue eyepieces (like Panoptics or Plössls). This saves time and makes it easier to change magnifications without losing your target.\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-EN5-16.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e16mm\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 (AFOV)\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\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eNagler Type 5 (6 elements in 4 groups)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e17.4mm\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\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes, with Tele Vue Group B eyepieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e0.45 lbs \/ 7.2 oz \/ 204 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e3.1\" \/ 79mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Diameter\u003c\/td\u003e\n\u003ctd\u003e1.9\" \/ 48mm\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 T5 16mm 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\"\u003e1.25\" Top 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\"\u003e1.25\" Bottom 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_5_16mm_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":51223879123229,"sku":"TV-EN5-16.0","price":418.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Nagler_T5_16mm_Eyepiece_1.jpg?v=1777515025","url":"https:\/\/davidastro.com\/en-eu\/products\/tele-vue-nagler-t5-16mm-82-degree-eyepiece","provider":"David Astro","version":"1.0","type":"link"}