{"product_id":"tele-vue-nagler-zoom-3-6mm-82-degree-eyepiece","title":"Tele Vue Nagler Zoom 3-6mm 82° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 3mm to 6mm Zoom\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 82° (Constant)\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eEye Relief: 10mm\u003c\/li\u003e\n\u003cli\u003eField Stop Diameter: 4.8mm (at 6mm) - 2.4mm (at 3mm)\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eWeight: 7.2 oz\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\/Software\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\u003eFour Naglers in One: The Ultimate Planetary Zoom Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Nagler Zoom 3-6mm 82° Eyepiece is a high-performance planetary and high-power observation tool that combines the power of four separate Nagler eyepieces into a single, compact unit. Engineered to deliver the legendary 82° \"spacewalk\" experience across its entire focal range, this eyepiece allows you to precisely match the magnification to atmospheric seeing conditions without ever taking your eye from the target. It is the definitive choice for observers who demand optical consistency and the convenience of instant focal length adjustment.\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\u003eContinuous Zoom with Precision Click-Stops\u003c\/h3\u003e\n\u003cp\u003eThe core of the Nagler Zoom is its seamless focal length adjustment from 6mm down to 3mm. A simple twist of the rubberized barrel moves you through the magnifications, allowing you to fine-tune the view in response to changing atmospheric stability. This means you can start at 6mm for a wider context view, and as moments of steady seeing arrive, you can increase power instantly to catch the finest details on Jupiter's cloud bands or inside a lunar crater.\u003c\/p\u003e\n\u003cp\u003eTo provide repeatability, the zoom mechanism features tactile click-stops at the 3, 4, 5, and 6mm positions. This is invaluable for observers who want to log observations at specific magnifications or for outreach sessions where you want to provide a consistent experience. The mechanism is smooth and precise, holding its position firmly once set.\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 Constant 82° Apparent Field of View\u003c\/h3\u003e\n\u003cp\u003eUnlike many zoom eyepieces that suffer from a \"tunnel vision\" effect at their highest power, the Nagler Zoom maintains its expansive 82° apparent field of view across the entire range. This constant field is a significant engineering achievement, ensuring the immersive, wide-open feeling that Naglers are famous for, regardless of your chosen focal length. The practical effect is a more engaging and comfortable viewing experience, especially when tracking objects in a non-driven Dobsonian, as the target takes longer to drift out of 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\u003eThe Nagler Optical Engine\u003c\/h3\u003e\n\u003cp\u003eThis eyepiece carries the Nagler name because it delivers the performance associated with it. The complex optical design provides sharp, high-contrast images that are well-corrected for aberrations like chromatic aberration and astigmatism, even in fast f\/ratio telescopes. Stars remain tight points across the field, and planetary details are rendered with high fidelity. The high-index glass and full multi-coatings maximize light throughput, which is critical at the high magnifications this eyepiece produces.\u003c\/p\u003e\n\u003cp\u003eObserving the Moon through the Nagler Zoom demonstrates its optical quality. As you zoom from 6mm to 3mm on the crater Clavius, the central peaks resolve from small bumps into a detailed mountain range. The shadows along the terminator remain pitch-black, with no color fringing, showcasing the contrast and color correction of the design.\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 Field Use\u003c\/h3\u003e\n\u003cp\u003eThe Nagler Zoom is designed for practical use at the telescope. It features a fold-down rubber eyeguard that helps position your eye correctly to see the full field and blocks stray light from interfering with your view. The 10mm of eye relief is consistent across the zoom range, though it is a tighter specification that requires observers to be close to the lens. This is a deliberate trade-off to achieve the compact size and wide, constant field of view.\u003c\/p\u003e\n\u003cp\u003eThe 1.25\" barrel includes a safety undercut groove that engages with the thumbscrew of your diagonal or focuser. This provides a secure connection and helps prevent the eyepiece from accidentally falling when the screw is loosened, protecting your investment. Its lightweight and compact form factor means it will not create significant balance issues, even on smaller telescopes.\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 Right Choice for High-Power Observing\u003c\/h3\u003e\n\u003cp\u003eThe Tele Vue Nagler 3-6mm Zoom is for the observer who prizes efficiency and optical excellence in high-magnification viewing. It excels on nights of variable seeing, where the ability to instantly adapt magnification is a significant advantage. While a set of individual fixed focal length eyepieces might offer slightly more eye relief, they cannot match the convenience and seamless adjustment of the zoom.\u003c\/p\u003e\n\u003cp\u003eThis eyepiece is an ideal partner for any high-quality refractor, Schmidt-Cassegrain, or Dobsonian telescope. It is the tool you reach for to split tight double stars, resolve planetary detail, or get the closest possible view of a small planetary nebula. By consolidating four high-power focal lengths into one, it simplifies your accessory case and maximizes your time observing.\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\"\u003eIs the Nagler 3-6mm Zoom as good as four individual Nagler eyepieces?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eFor pure optical performance, it comes very close. While some observers find individual eyepieces to have a slight edge in light transmission or eye relief, the Nagler Zoom's convenience and ability to precisely match magnification to seeing conditions often result in better observed detail. It's a trade-off between ultimate performance and ultimate flexibility.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDoes the field of view really stay at 82° across the whole zoom range?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, Tele Vue engineered this eyepiece to maintain a constant 82° apparent field of view at every focal length from 3mm to 6mm. This is a key feature that distinguishes it from many other zoom eyepieces where the field of view narrows significantly at higher powers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to refocus after changing the zoom setting?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Nagler Zoom is nearly parfocal across its range, meaning it requires little to no refocusing when you change magnification. Minor adjustments may be needed depending on your telescope and your eye, but it is designed to hold focus well.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 10mm eye relief enough for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 10mm eye relief is considered short and is generally not sufficient for observers who need to wear glasses to correct for astigmatism. For best results, it is recommended to observe without glasses. This eyepiece is compatible with Tele Vue's DIOPTRX correctors.\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 Nagler 3-6mm Zoom?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIt is primarily a high-power eyepiece for lunar, planetary, and double star observing. Its ability to adjust magnification on the fly makes it perfect for finding the maximum useful power that atmospheric seeing conditions will allow on any given night.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Nagler Zoom compare to using a Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Nagler Zoom offers more flexibility than a Barlow. A Barlow lens doubles the magnification of your existing eyepieces, but the zoom provides a continuous range of magnifications. It's a more integrated and convenient solution for adjusting power without swapping multiple pieces of gear.\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\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eTV-ENZ-0306\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e3mm - 6mm, continuous zoom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e82° (constant)\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\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e10mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e4.8mm (at 6mm) to 2.4mm (at 3mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClick Stops\u003c\/td\u003e\n\u003ctd\u003e3, 4, 5, 6mm\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\u003e7.2 oz (0.45 lbs \/ 204 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e3.4\" (86 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 Nagler Zoom 3-6mm Eyepiece\" src=\"\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eTele Vue Nagler Zoom 3-6mm 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\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Dust Cap (Top)\" src=\"\"\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 1.25-inch Dust Cap (Bottom)\" src=\"\"\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_Nagler_3-6mm_Zoom_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":51223879581981,"sku":"TV-ENZ-0306","price":682.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Nagler_Zoom_3-6mm_Eyepiece_1.jpg?v=1777515026","url":"https:\/\/davidastro.com\/products\/tele-vue-nagler-zoom-3-6mm-82-degree-eyepiece","provider":"David Astro","version":"1.0","type":"link"}