{"title":"TeleVue Delos 72° Eyepieces","description":"\u003cp\u003eTeleVue Delos eyepieces offer a 72° apparent field of view with 20mm of eye relief across the range, plus an adjustable eyeguard for consistent eye position.\u003c\/p\u003e\u003cp\u003eThe 1.25\" models run from 3.5mm to 17.3mm, including 6mm, 8mm, 10mm, 12mm and 14mm, and a 24mm model uses a 2\" barrel. They give sharp, high-contrast views of planets and deep-sky objects while staying comfortable for eyeglass wearers.\u003c\/p\u003e","products":[{"product_id":"tele-vue-delos-24mm-72-eyepiece","title":"Tele Vue Delos 24mm 72° Eyepiece - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e24mm Focal Length\u003c\/li\u003e\n\u003cli\u003e72° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e2\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003e22mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e29.6mm Field Stop\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\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\u003eTele Vue 24mm Delos Eyepiece - 2\"\u003c\/h2\u003e\n      \u003cp\u003eThe Tele Vue 24mm Delos is a high-contrast, mid-power optic designed to deliver a 72° apparent field of view with a constant 22mm of eye relief. Unlike most of the Delos line, this specific focal length utilizes a 2-inch barrel format to accommodate its internal lens geometry while maintaining mechanical stability. In an f\/8 refractor, it produces a 3mm exit pupil, providing a balanced background for observing deep-sky targets like the Hercules Cluster (M13).\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eOptical Fidelity and Field Correction\u003c\/h3\u003e\n      \u003cp\u003eBy employing high-index glass and specialized anti-reflection coatings, the 24mm Delos minimizes lateral color and maintains sharp star images across the entire 72° field. The design is optimized for fast focal ratio telescopes, ensuring minimal astigmatism even at the edge of the field stop.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eStray Light Control:\u003c\/strong\u003e Precision internal baffling and blackened lens edges reduce ghosting when observing bright objects near the field edge, such as the Moon or Albireo.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExit Pupil Management:\u003c\/strong\u003e The 24mm focal length provides a 4.8mm exit pupil in f\/5 systems, maximizing light throughput for large emission nebulae like the North American Nebula (NGC 7000).\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eAdjustable Mechanical Interface\u003c\/h3\u003e\n      \u003cp\u003eThe eyepiece features a sliding, lockable eyeguard housing that allows the observer to set the eye distance precisely. This mechanism is critical for managing the 22mm eye relief and preventing the \"blackouts\" associated with incorrect eye placement.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eLong Eye Relief:\u003c\/strong\u003e The 22mm spec allows observers with eyeglasses to view the full 72° field without contact between the lens and frames.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDioptrx Integration:\u003c\/strong\u003e The top housing is compatible with the Tele Vue Dioptrx astigmatism corrector, allowing for sharp views without wearing glasses.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"DAV-bg-light\"\u003e\n    \u003cdiv class=\"DAV-section\"\u003e\n      \u003ch3\u003eOperational Comparison\u003c\/h3\u003e\n      \u003cp\u003eSelecting the 24mm Delos involves balancing barrel size requirements and eye relief preferences within the Tele Vue ecosystem.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003evs. 24mm Panoptic:\u003c\/strong\u003e The 24mm Delos requires a 2-inch diagonal or focuser, whereas the Panoptic fits 1.25-inch holders; however, the Delos offers 5mm more eye relief and a wider 72° apparent field.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003evs. 22mm Nagler Type 4:\u003c\/strong\u003e The Delos provides 22mm of eye relief and a more neutral color balance compared to the 82° Nagler, which features 19mm of relief and a slightly warmer tone.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Tele Vue 24mm Delos a 2-inch eyepiece while others are 1.25-inch?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eTo maintain a constant 22mm eye relief and 72° apparent field at this focal length, the \u003cstrong\u003eTele Vue 24mm Delos\u003c\/strong\u003e requires larger internal lens elements. This necessitated a 2-inch barrel to avoid vignetting and maintain structural integrity.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eWill the Tele Vue 24mm Delos work in a 1.25-inch diagonal?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eNo, the \u003cstrong\u003eTele Vue 24mm Delos\u003c\/strong\u003e features a dedicated 2-inch barrel. You must use a 2-inch diagonal or a telescope with a 2-inch focuser to utilize this eyepiece.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion\"\u003e\n    \u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 24mm Delos suitable for planetary observing?\u003c\/h3\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"DAV-accordion-A\"\u003e\n    \u003cp\u003eYes, its high contrast and color neutrality make the \u003cstrong\u003eTele Vue 24mm Delos\u003c\/strong\u003e excellent for medium-magnification planetary views, particularly in long focal length telescopes like SCTs where it helps frame the planet alongside its moons.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003ctable class=\"DAV-specifications\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003ctd\u003eModel #\u003c\/td\u003e\n\u003ctd\u003eEDL-24.0\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e24 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e22 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e29.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.20 lb (544 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n  \u003cul class=\"DAV-grid\"\u003e\n    \u003cli class=\"DAV-grid-item\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Delos-24mm-Eyepiece.jpg\" alt=\"Tele Vue 24mm Delos Eyepiece\" class=\"DAV-img-box\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003e24mm Delos Eyepiece (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 src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-cap.jpg\" alt=\"Tele Vue 2-inch Dust Cap\" class=\"DAV-img-box\"\u003e\n      \u003cdiv\u003e\n        \u003cp class=\"DAV-item-title\"\u003eDust Cap Set\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\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/www.televue.com\/pdf\/literature\/Delos%20Instructions.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\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/televue-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":51177535078685,"sku":"TV-EDL-24.0","price":771.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele-Vue-Delos-24mm-Eyepiece-1.jpg?v=1776473721"},{"product_id":"tele-vue-delos-17-3mm-72-degree-eyepiece","title":"Tele Vue Delos 17.3mm 72° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 17.3mm\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 72°\u003c\/li\u003e\n\u003cli\u003eEye Relief: 20mm\u003c\/li\u003e\n\u003cli\u003eField Stop Diameter: 21.2mm\u003c\/li\u003e\n\u003cli\u003eWeight: 0.90 lbs (408g)\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\u003eA Flawless Window on the Mid-Power Sky\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Delos 17.3mm 72° Eyepiece is a 1.25\" wide-field eyepiece engineered for observers who refuse to compromise on optical purity. It combines a generous field of view with exceptional correction, contrast, and comfort, delivering a viewing experience that feels transparent and natural. For those seeking the highest fidelity in the critical mid-power range, the Delos 17.3mm sets a benchmark for 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 Delos High-Correction Optical Engine\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Delos is a highly corrected optical system designed to render a flat, sharp field of view. By controlling for aberrations like astigmatism and chromatic aberration from the center to the very edge, the eyepiece delivers pinpoint stars across its entire expanse. This level of correction means you are not limited to the center of the field for critical observation; the view remains pristine as your eye drifts across it.\u003c\/p\u003e\n\u003cp\u003eThis optical precision translates directly into higher contrast on difficult targets. When viewing globular clusters, the sharp star points resolve more cleanly against the black background, allowing you to pick out individual members deeper into the core. On the Moon and planets, the absence of false color ensures that subtle details and natural color tones are preserved.\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 Immersive 72° Apparent Field\u003c\/h3\u003e\n\u003cp\u003eThe 72° apparent field of view provides a significant window on the sky that feels both expansive and comfortable. This field is wide enough to frame larger deep-sky objects, like the full expanse of the Andromeda Galaxy's core or the Beehive Cluster, without requiring you to pan your telescope. The experience is immersive, giving you a sense of looking through a porthole into space rather than a narrow tube.\u003c\/p\u003e\n\u003cp\u003eThe key trade-off in the Delos design is prioritizing perfect optical correction over achieving the absolute widest field possible. While eyepieces like the Nagler or Ethos offer larger fields, the Delos commits its entire 72° field to near-perfect fidelity. This makes it the right choice when image purity is more important than sheer field size.\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\u003eConstant 20mm Eye Relief for Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eEvery eyepiece in the Delos line features a constant, generous 20mm of eye relief. This is a deliberate design choice that ensures maximum comfort during long observing sessions, completely eliminating eye strain. For observers who wear glasses to correct for astigmatism, this long eye relief allows you to see the entire 72° field of view without removing your spectacles.\u003c\/p\u003e\n\u003cp\u003eThe fixed eye relief across the series also provides a consistent feel as you switch between different Delos focal lengths. Your head position and viewing posture remain the same, allowing you to concentrate on the object in view rather than readjusting your approach every time you change magnification.\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 Eye Placement with a Locking Eyeguard\u003c\/h3\u003e\n\u003cp\u003eTo make perfect use of the optical system, your eye must be positioned correctly. The Delos features an intuitive sliding eyeguard with a locking mechanism that allows you to set the ideal height and secure it in place. This mechanism ensures your eye returns to the exact same position every time you look into the eyepiece, preventing blackouts and kidney-beaning effects.\u003c\/p\u003e\n\u003cp\u003eThis practical feature is invaluable in the field. Once you find the sweet spot for your eye, you can lock it down, block out stray light from your surroundings, and maintain a comfortable, stable view throughout the night. It transforms the eyepiece from just a set of optics into a predictable and reliable observing 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\u003eMaximum Contrast through Advanced Coatings\u003c\/h3\u003e\n\u003cp\u003eTo ensure the image is as bright and contrasty as possible, every air-to-glass surface in the Delos 17.3mm receives Tele Vue's proprietary index-matched multi-coatings. These advanced coatings maximize light throughput, resulting in brighter images of faint nebulae and galaxies. Furthermore, the edges of all lenses are blackened to absorb stray light that could otherwise reduce contrast and wash out fine detail.\u003c\/p\u003e\n\u003cp\u003eThe visual result is a deep, dark background sky that makes celestial objects \"pop\" in the field of view. When observing an object like the Orion Nebula through the Delos 17.3mm in a moderate aperture telescope, the faint outer loops of nebulosity are more easily visible, and the tightly packed stars of the Trapezium resolve cleanly without distracting 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\u003eSeamless Workflow with a Parfocal Design\u003c\/h3\u003e\n\u003cp\u003eThe Delos 17.3mm is designed to be parfocal with all other Tele Vue Delos, Panoptic, Nagler, and Plössl eyepieces. This means that when you switch between any of these eyepieces, the need to refocus is dramatically reduced or eliminated entirely. This is a powerful workflow advantage that saves valuable time at the telescope.\u003c\/p\u003e\n\u003cp\u003eImagine locating an object with a low-power Panoptic and then swapping to the Delos 17.3mm for a closer look. With a parfocal system, the object snaps right into view with little to no adjustment of the focuser. This keeps your target centered and allows you to spend more time observing and less time hunting for focus in the dark.\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\"\u003eHow does the Delos 17.3mm compare to a Tele Vue Nagler eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Delos 17.3mm has a 72° apparent field of view and 20mm of eye relief, prioritizing optical purity and viewing comfort. A Nagler has a wider 82° field but shorter eye relief. Observers with eyeglasses or those who value a more relaxed view often prefer the Delos, while those seeking the most immersive \"spacewalk\" experience may choose the Nagler.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 20mm of eye relief good for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 20mm of eye relief is excellent for eyeglass wearers. It allows you to keep your glasses on and still see the entire 72° field of view, which is critical if you need them to correct for astigmatism.\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, the Delos line is exceptionally well-corrected and performs superbly in fast telescopes. You can expect sharp stars across the entire field of view, even at f\/4. For best results, pairing it with a Tele Vue Paracorr Type 2 will correct for the telescope's native coma.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat kind of targets is the Delos 17.3mm best for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 17.3mm focal length provides a versatile medium magnification. It is ideal for framing medium-to-large open clusters like the Pleiades, viewing globular clusters with high contrast, and observing large galaxies and nebulae like the Andromeda Galaxy or the Lagoon Nebula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the purpose of the locking eyeguard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe locking eyeguard allows you to set the perfect distance between your eye and the eyepiece lens for optimal viewing. Once you find this position, you can lock it, which prevents blackouts and ensures you get the full, comfortable field of view every time you look through it.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Delos 17.3mm compatible with DIOPTRX?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Delos 17.3mm is fully compatible with the Tele Vue DIOPTRX astigmatism corrector. This allows users with astigmatism to observe without wearing their glasses, while still achieving a perfectly sharp image.\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-EDL-17.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e17.3mm\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\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e21.2mm\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\u003e0.90 lbs \/ 14.4 oz \/ 408 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight (max)\u003c\/td\u003e\n\u003ctd\u003e4.3 in \/ 109 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes, with Tele Vue Plössl, Panoptic, Nagler, and other Delos eyepieces\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 Delos 17.3mm 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_Delos_17.3mm_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":51223878664477,"sku":"TV-EDL-17.3","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_17.3mm_Eyepiece_1.jpg?v=1777515021"},{"product_id":"tele-vue-delos-14mm-72-degree-eyepiece","title":"Tele Vue Delos 14mm 72° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 14mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 72°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eEye Relief: 20mm\u003c\/li\u003e\n\u003cli\u003eField Stop Diameter: 17.3mm\u003c\/li\u003e\n\u003cli\u003eDioptrx-Ready: Yes\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\u003ePlanetary Contrast Meets Immersive Views: The Delos 14mm Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Delos 14mm 72° Eyepiece is a high-performance 1.25\" eyepiece that delivers the sharpness, contrast, and color fidelity of a planetary eyepiece across an immersive, medium-power field of view. It is engineered for observers who refuse to compromise on optical purity but desire a more expansive window on the universe than traditional designs allow. This eyepiece excels at revealing fine detail on solar system objects while providing enough field to frame globular clusters and smaller nebulae against a dark, uniform background.\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\u003eAdvanced Optical Design for High-Fidelity Views\u003c\/h3\u003e\n\u003cp\u003eAt the heart of the Delos is a sophisticated optical system designed to create a flat, high-contrast, and distortion-free image. Every glass surface is fully multi-coated to maximize light transmission and minimize scatter, resulting in views that are exceptionally bright with a neutral color balance. The internal baffling and blackened lens edges further enhance contrast by eliminating internal reflections that can wash out faint details.\u003c\/p\u003e\n\u003cp\u003eFor you, this means that bright objects like Jupiter and Saturn snap into focus with sharp, well-defined edges, free of distracting internal glare or false color. Faint planetary cloud belts and subtle lunar rilles are rendered with clarity, while the true colors of stars are preserved, making it an excellent choice for resolving tight double 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\u003eThe 72° Apparent Field of View Sweet Spot\u003c\/h3\u003e\n\u003cp\u003eThe Delos's 72° apparent field of view (AFOV) provides a tangible sense of immersion without introducing the edge-of-field aberrations often found in more extreme wide-field designs. This field is wide enough to feel expansive, allowing you to comfortably track objects in a non-driven telescope without them drifting out of view too quickly. The optical correction ensures stars remain sharp points across the entire field, even in faster f\/ratio telescopes.\u003c\/p\u003e\n\u003cp\u003eOn a target like the Hercules Globular Cluster (M13), the 14mm Delos in a 10-inch f\/10 Schmidt-Cassegrain provides 179x magnification. This is enough power to resolve the dense core into a spray of individual stars, while the 72° field is wide enough to frame the entire cluster with surrounding dark sky, giving it a distinct three-dimensional appearance.\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\u003eConsistent 20mm Eye Relief for Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eEvery eyepiece in the Delos line features a constant 20mm of eye relief, a generous distance that allows most observers, including those who wear glasses for astigmatism, to see the entire field of view without strain. This consistent specification across the series means you can switch between different Delos focal lengths without needing to readjust your viewing position. The long eye relief reduces eye fatigue during extended observing sessions, letting you concentrate on the object, not on finding a comfortable head position.\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 Adjustable and Locking Eyeguard\u003c\/h3\u003e\n\u003cp\u003eTo make perfect use of the long eye relief, the Delos incorporates a sliding, locking eyeguard mechanism. This allows you to set the ideal distance between your eye and the top lens and lock it in place, preventing accidental shifts during use. By customizing the eyeguard height, you can effectively block stray light and maintain the correct eye placement needed to see the full 72° field without experiencing blackouts or kidney-beaning effects.\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\u003eReady for Dioptrx Astigmatism Correction\u003c\/h3\u003e\n\u003cp\u003eA key feature for many observers is the Delos's compatibility with Tele Vue's Dioptrx system. The top of the eyepiece is threaded to accept these astigmatism correctors directly, allowing you to observe without your eyeglasses while still achieving perfectly sharp star images. This creates a more direct and unencumbered connection to the eyepiece, eliminating the reflections and field reduction that can occur when looking through both your glasses and the eyepiece optics.\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\u003eDurable 1.25\" Barrel with Filter Threads\u003c\/h3\u003e\n\u003cp\u003eThe Delos 14mm uses a standard 1.25\" chrome barrel for broad compatibility with any telescope accepting this format. The barrel features a safety undercut to help prevent the eyepiece from accidentally slipping out of the focuser or diagonal. It is also threaded to accept standard 1.25\" filters, allowing you to easily add a moon filter, light pollution filter, or planetary color filter to enhance your views without needing separate adapters.\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 Mid-Power Eyepiece: Delos vs. Nagler and Panoptic\u003c\/h3\u003e\n\u003cp\u003eThe Delos series occupies a specific niche in the Tele Vue lineup, trading the extreme field of a Nagler for superior contrast and eye relief.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler Type 6 13mm:\u003c\/strong\u003e The Nagler offers a wider 82° apparent field, creating a more dramatic \"spacewalk\" effect. However, the Delos 14mm provides significantly more eye relief (20mm vs. 12mm) and is often perceived as having higher contrast, making it a better choice for planetary detail and for observers who require eyeglasses.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Panoptic 15mm:\u003c\/strong\u003e The Panoptic offers a 68° field and is a smaller, lighter eyepiece. The Delos provides a slightly larger and more corrected field of view with longer eye relief, making it a step up in viewing comfort and edge performance for a modest increase in size and weight. The choice here is often between maximum portability (Panoptic) and a more immersive, comfortable experience (Delos).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe genuine trade-off for the Delos's performance is its size and weight compared to simpler designs like Plössls or the Panoptic series. It requires a robust focuser and may necessitate rebalancing the telescope when swapping with much lighter eyepieces. For many, this is a minor inconvenience for the level of optical quality and viewing comfort it provides.\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 Delos 14mm good for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it excels at it. The Delos line is known for high-contrast, sharp optics with neutral color, making it ideal for discerning fine details on Jupiter's cloud bands, Saturn's rings, and features on Mars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Delos 14mm compare to a Nagler 13mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Delos 14mm offers superior viewing comfort with 20mm of eye relief versus the Nagler's 12mm. While the Nagler has a wider 82° field, the Delos is often preferred by planetary observers for its perceived higher contrast and by anyone who wears glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to use a Paracorr with the Delos 14mm in my Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn fast Dobsonians (f\/4.5 or lower), a coma corrector like the Tele Vue Paracorr is recommended with any eyepiece to ensure sharp stars across the entire field. The Delos is well-corrected, but it cannot fix the coma inherent in the telescope's mirror.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Delos 14mm if I wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The long 20mm of eye relief is specifically designed to allow eyeglass wearers to see the full 72° field of view. If your glasses correct for astigmatism, you can also use Tele Vue's Dioptrx accessory instead of your glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the purpose of the locking eyeguard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe locking eyeguard allows you to set the perfect distance for your eye from the top lens and keep it there. This prevents \"blackouts\" or \"kidney-beaning\" and ensures you are always positioned to see the entire field comfortably, especially when sharing the view with others.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Delos 14mm too heavy for a small telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 14.4 oz (408 g), it is a substantial eyepiece. While it will work well in most telescopes, you may need to rebalance smaller refractors or Dobsonians when switching from very lightweight eyepieces. A quality focuser is recommended.\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-EDL-14.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e14mm\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\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e17.3mm\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\u003e14.4 oz \/ 408 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e4.3\" \/ 109mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" Standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParacorr Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDioptrx Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\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 Delos 14mm 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_Delos_14mm_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":51223878697245,"sku":"TV-EDL-14.0","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_14mm_Eyepiece_1.jpg?v=1777515020"},{"product_id":"tele-vue-delos-12mm-72-degree-eyepiece","title":"Tele Vue Delos 12mm 72° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 12mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 72°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eEye Relief: 20mm\u003c\/li\u003e\n\u003cli\u003eField Stop Diameter: 15.0mm\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eWeight: 14.4 oz (0.90 lbs)\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\u003eHigh-Contrast Clarity Meets Immersive Comfort in a Planetary Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Delos 12mm 72° Eyepiece is an optical instrument designed to deliver the immersive feel of a wide-field eyepiece with the high-contrast, on-axis performance of a dedicated planetary ocular. It combines a generous 72° apparent field with long eye relief, creating a viewing experience that is both expansive and comfortable for extended sessions at the telescope, whether you wear eyeglasses or not.\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 72° Apparent Field Optical System\u003c\/h3\u003e\n\u003cp\u003eThe Delos optical design achieves a wide 72° apparent field of view while maintaining exceptional control over aberrations. Every glass surface is fully multi-coated, and lens edges are blackened to maximize light throughput and suppress internal reflections. The result is a bright, high-contrast image with a neutral color balance, allowing the natural hues of planets and stars to be observed without artificial tint.\u003c\/p\u003e\n\u003cp\u003eThis level of correction makes the 12mm Delos a versatile performer. On a short focal length refractor, it can frame open clusters like the Pleiades with pinpoint stars across the field. In a large Dobsonian, it provides the magnification needed to resolve fine detail in globular clusters such as M13, where the wide field helps to frame the object against a dark, velvety background.\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\u003eConsistent 20mm Eye Relief and Adjustable Eyeguard\u003c\/h3\u003e\n\u003cp\u003eA defining feature of the Delos line is its comfortable and consistent 20mm of eye relief across all focal lengths. This is a significant benefit for observers who wear eyeglasses for astigmatism, as it allows you to see the entire 72° field without having to press your glasses against the lens. You can simply leave your glasses on and enjoy the full view.\u003c\/p\u003e\n\u003cp\u003eTo accommodate observers who do not wear glasses, Tele Vue developed an intuitive sliding, locking eyeguard. This mechanism allows you to set the height of the soft rubber eyeguard to the perfect position for your eye, effectively blocking stray light and preventing blackouts. Once set, it stays put, ensuring a comfortable and repeatable viewing position every time you use the 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\u003eReady for Dioptrx Astigmatism Correction\u003c\/h3\u003e\n\u003cp\u003eFor observers with astigmatism who prefer not to wear glasses at the eyepiece, the Delos series is fully compatible with the Tele Vue Dioptrx system. The eyeguard housing is specifically designed to accept any Dioptrx corrector, which simply drops into the top of the eyepiece. This allows you to dial in your precise astigmatism correction, ensuring the sharpest possible views without corrective lenses in the way.\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 Flat Field for Sharpness Edge-to-Edge\u003c\/h3\u003e\n\u003cp\u003eThe Delos optical formula is engineered to produce a flat focal plane, a critical performance factor, especially in well-corrected telescopes. This means that if a star is in sharp focus in the center of the field, it remains a tight point of light all the way to the field stop. This characteristic is vital for lunar and planetary observing, where you want to see uniform sharpness across the entire disk of Jupiter or the Moon's terminator.\u003c\/p\u003e\n\u003cp\u003eThe trade-off for this level of correction in a compact 1.25\" barrel is weight. The Delos 12mm is a substantial eyepiece, and its mass is a direct consequence of the large, high-index glass elements required to achieve this performance. While it balances well on most telescopes, it is a point of consideration for users with very small, lightweight 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\u003eMaximizing Contrast with Internal Baffling\u003c\/h3\u003e\n\u003cp\u003eBeyond the lens coatings, the internal mechanics of the Delos are optimized for contrast. All interior surfaces are treated with anti-reflective finishes, and sharp-edged baffles are placed to intercept stray light paths. This attention to detail pays off when observing faint details near bright objects, like trying to spot the Cassini Division in Saturn's rings or resolving faint craterlets on the floor of Plato on the Moon.\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 Fit with the 1.25\" Barrel and Safety Undercut\u003c\/h3\u003e\n\u003cp\u003eThe Delos 12mm uses a standard 1.25\" barrel for broad compatibility with any telescope accepting this format. It features a machined safety undercut, which is a groove that allows the focuser's set screw to securely lock the eyepiece in place. This provides peace of mind, helping to prevent the eyepiece from accidentally slipping out of the focuser if a screw loosens slightly during a cold 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\u003eObserving with the Delos 12mm\u003c\/h3\u003e\n\u003cp\u003eImagine using the 12mm Delos in an 8-inch, f\/10 Schmidt-Cassegrain, yielding about 169x magnification. Centered on Jupiter, the planet's disk is large and sharply defined. As your eye adapts, the main equatorial belts resolve into finer, parallel bands with subtle coloration. The Great Red Spot, when visible, stands out not just as a smudge but as an entity with structure, all while the Galilean moons hang like sharp diamonds in the dark space nearby, perfectly in focus even at the edge of the 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\u003eChoosing Your Mid-Power Tele Vue Eyepiece\u003c\/h3\u003e\n\u003cp\u003eThe Delos 12mm occupies a space between several other Tele Vue families, each with distinct advantages.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler 12mm Type 4:\u003c\/strong\u003e The Nagler offers a wider 82° apparent field, creating a more pronounced \"spacewalk\" effect. However, the Delos provides significantly more eye relief (20mm vs. 12mm), making it the clear choice for observers who wear eyeglasses. The Delos is also often perceived as having slightly higher contrast for planetary viewing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Panoptic 15mm:\u003c\/strong\u003e The 15mm Panoptic has a smaller 68° apparent field and is much lighter than the Delos. It is an excellent choice for a lower-power, grab-and-go eyepiece. You would choose the 12mm Delos when you need more magnification and prefer its longer eye relief and slightly wider, more corrected field.\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 Tele Vue Delos 12mm good for someone with eyeglasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an excellent choice. The Delos 12mm features a long 20mm of eye relief, which allows most eyeglass wearers to see the full 72° field of view comfortably without removing their glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Delos 12mm compare to the Nagler 12mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Nagler 12mm has a wider 82° apparent field, but the Delos 12mm offers more eye relief (20mm vs 12mm) and is often considered to have slightly higher contrast, making it a strong performer on planets and the Moon.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main advantage of the Delos adjustable eyeguard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe adjustable eyeguard allows you to set the perfect distance between your eye and the eyepiece lens. This helps to see the entire field of view easily and blocks stray light from your surroundings, which improves contrast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use a Tele Vue Delos eyepiece with a Dioptrx astigmatism corrector?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, all Delos eyepieces are designed to be fully compatible with the Tele Vue Dioptrx system. The corrector fits directly into the top of the eyepiece, allowing you to observe without your glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Delos 12mm too heavy for a small telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAt 14.4 ounces (408 grams), the Delos 12mm is a substantial eyepiece. While it will work with any 1.25\" focuser, it may present a balance challenge on very small, lightweight telescopes. It is always best to check your mount's capacity.\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\u003eEDL-12.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e12mm\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\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e15.0mm\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\u003e14.4 oz (0.90 lbs \/ 408 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e4.3\" L x 2.0\" W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDioptrx Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\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 Delos 12mm 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_Delos_12mm_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":51223878730013,"sku":"TV-EDL-12.0","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_12mm_Eyepiece_1.jpg?v=1777515020"},{"product_id":"tele-vue-delos-10mm-72-degree-eyepiece","title":"Tele Vue Delos 10mm 72° Eyepiece - 1.25\"","description":"","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51223878762781,"sku":"TV-EDL-10.0","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_10mm_Eyepiece_1.jpg?v=1777515020"},{"product_id":"tele-vue-delos-8mm-72-degree-eyepiece","title":"Tele Vue Delos 8mm 72° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 8mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 72°\u003c\/li\u003e\n\u003cli\u003eEye Relief: 20mm\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eField Stop Diameter: 9.9mm\u003c\/li\u003e\n\u003cli\u003eWeight: 1.00 lbs \/ 454 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\u003eWalk Into the View: The High-Power Delos 8mm Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Delos 8mm 72° Eyepiece is a high-magnification planetary and deep-sky instrument designed to deliver the optical performance of the flagship Ethos line in a more accessible, consistently comfortable format. It pairs a wide 72° apparent field with long, 20mm eye relief, creating an immersive, high-contrast window for detailed exploration of celestial targets. For the observer who refuses to compromise on comfort during critical, high-power observation, the Delos 8mm is an uncompromising choice.\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 Delos Optical Design: Clarity Across a 72° Field\u003c\/h3\u003e\n\u003cp\u003eAt the core of the Delos 8mm is a sophisticated, multi-element optical system engineered for exceptional correction. The design minimizes aberrations like chromatic aberration and astigmatism, resulting in sharp, high-contrast views from the center to the very edge of the 72° field. This level of correction means that star clusters resolve into tight pinpoints across the entire view, and subtle planetary details remain sharp without false color.\u003c\/p\u003e\n\u003cp\u003eThis optical precision makes the Delos 8mm a versatile performer. In a short focal length refractor, it can provide the high magnification needed to split tight double stars or resolve globular clusters like M13 into a granular diamond dust. In a larger Dobsonian, it delivers the power to hunt for fine structure within planetary nebulae or examine the delicate dust lanes in brighter galaxies.\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\u003eConsistent 20mm Eye Relief for Total Comfort\u003c\/h3\u003e\n\u003cp\u003eEvery eyepiece in the Delos line, including the 8mm, features a generous and constant 20mm of eye relief. This is a deliberate design choice that directly impacts your observing comfort and effectiveness, especially during long sessions. Unlike many high-power eyepieces that require you to press your eye against the lens, the Delos allows you to relax and find a natural head position.\u003c\/p\u003e\n\u003cp\u003eFor observers who wear glasses to correct for astigmatism, this long eye relief is essential. It provides enough distance to see the entire 72° field of view without removing your spectacles. The benefit is immediate: you can spend your time observing the target, not struggling to find a comfortable viewing position.\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\u003eAdjustable Locking Eyeguard for Precise Positioning\u003c\/h3\u003e\n\u003cp\u003eTo make perfect use of the long eye relief, the Delos 8mm incorporates an intuitive, sliding eyeguard with a locking mechanism. This is not a simple fold-up rubber cup. You can raise the guard to the exact height that positions your eye at the ideal exit pupil distance, effectively eliminating blackouts or \"kidney bean\" effects that can plague other long eye relief designs.\u003c\/p\u003e\n\u003cp\u003eOnce you find your perfect position, a simple twist locks it in place. This ensures your eye is returned to the same optimal point every time you look into the eyepiece, a critical feature for maintaining dark adaptation and focus on faint details. It's a mechanical solution that provides a consistent, repeatable observational experience.\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 Contrast with Superior Coatings and Baffling\u003c\/h3\u003e\n\u003cp\u003eHigh magnification demands the highest possible contrast to reveal faint details. The Delos 8mm achieves this through Tele Vue's proprietary full multi-coatings on every air-to-glass surface and meticulous edge-blackening of each lens element. These treatments work in concert to maximize light transmission while suppressing stray light and internal reflections.\u003c\/p\u003e\n\u003cp\u003eThe visual result is a darker background sky and an enhanced perception of detail. On Jupiter, you will find it easier to distinguish between subtle belt and zone colors. When observing the Moon, the terminator appears crisp and well-defined, with deep black shadows that reveal crater wall topography with stark clarity.\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 Experience of High Power: A Night on Jupiter\u003c\/h3\u003e\n\u003cp\u003eImagine centering Jupiter in your telescope with the Delos 8mm on a night of steady seeing. At this magnification, the planet is no longer a small disc but a detailed world. The first things you notice are the two main equatorial belts, but as your eye adapts, the eyepiece's contrast allows you to pick out thinner, fainter belts and the subtle, swirling festoons between them.\u003c\/p\u003e\n\u003cp\u003eWith patience, the Great Red Spot, if visible, shows not just its presence but hints of its oval shape and texture. The four Galilean moons are not just points of light; they are tiny, distinct discs against the blackness of space. This is the advantage of a well-corrected, high-contrast, high-power eyepiece: it transforms familiar targets into objects of deep exploration.\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\u003eBuilt for the Field: Barrel Design and Dioptrx\u003c\/h3\u003e\n\u003cp\u003eThe Delos 8mm features a chrome-plated 1.25\" barrel that is both durable and precisely machined for a smooth fit in any standard focuser. It includes the signature Tele Vue safety undercut, a groove machined into the barrel that helps prevent the eyepiece from accidentally slipping out of the focuser if the locking screw loosens. This small detail provides peace of mind when handling your equipment in the dark.\u003c\/p\u003e\n\u003cp\u003eLike all premium Tele Vue eyepieces, the Delos is also threaded to accept the Dioptrx astigmatism corrector. This allows observers with astigmatism to dial in a perfect correction at the eyepiece itself, enabling them to observe without their glasses and still achieve the sharpest possible views. It's a system that prioritizes the best possible image for every observer.\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 Delos 8mm good for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it is an excellent choice for planetary observation. The 8mm focal length provides high magnification suitable for most telescopes, and the highly corrected optics deliver the sharpness and contrast needed to see fine details on Jupiter, Saturn, and Mars.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Delos compare to the Tele Vue Nagler or Panoptic series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Delos was designed to be a bridge between the two. It offers a wider field than a Panoptic (72° vs 68°) but prioritizes a long, consistent 20mm eye relief, which the ultra-wide 82° Naglers do not. If comfort, especially with glasses, is your top priority, the Delos is often the better choice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need a Paracorr with the Delos 8mm in my fast Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, for fast reflectors (f\/5 or below), a coma corrector like the Tele Vue Paracorr Type 2 is highly recommended. While the Delos has excellent edge-of-field correction, it cannot correct for the coma inherent in the telescope's primary mirror. The Paracorr will ensure stars remain sharp across the entire 72° field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main trade-off with the Delos design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary trade-off is size and weight for the comfort it provides. To achieve the wide field and long eye relief, the Delos eyepieces are larger and heavier than simpler designs like a Plössl. This is a consideration for small, lightweight telescopes where balance can be an issue.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Delos 8mm for deep-sky observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The 8mm focal length is ideal for resolving the cores of globular clusters, viewing smaller planetary nebulae like the Ring Nebula (M57) or the Dumbbell Nebula (M27), and examining details in the brighter galaxies.\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-EDL-08.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm\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\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e9.9mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003eNot specified by manufacturer\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\u003e1.00 lbs (454 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e4.3\" (109 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Diameter\u003c\/td\u003e\n\u003ctd\u003e2.1\" (53 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003e1.25\" (M28.5 x 0.6)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes, with other Delos eyepieces\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 Delos 8mm 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_Delos_8mm_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":51223878861085,"sku":"TV-EDL-08.0","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_8mm_Eyepiece_1.jpg?v=1777515020"},{"product_id":"tele-vue-delos-6mm-72-degree-eyepiece","title":"Tele Vue Delos 6mm 72° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 6mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 72°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eEye Relief: 20mm\u003c\/li\u003e\n\u003cli\u003eOptical Design: Delos\u003c\/li\u003e\n\u003cli\u003eCoatings: Fully Multi-Coated\u003c\/li\u003e\n\u003cli\u003eWeight: 1.00 lbs\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\u003ePlanetary Power Meets Deep-Sky Comfort: The Delos 6mm Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Delos 6mm 72° Eyepiece is an optical instrument designed for high-magnification observers who refuse to compromise on comfort or field of view. It delivers the sharp, high-contrast performance required for detailed planetary, lunar, and double-star observation, while providing a wide 72° apparent field and a generous 20mm of eye relief. This unique combination solves the classic problem of high-power eyepieces: the trade-off between power and viewing comfort.\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 Wide-Field Window for High-Power Observing\u003c\/h3\u003e\n\u003cp\u003eThe Delos 6mm provides a 72-degree apparent field of view that feels expansive at high power. This moderately wide field makes it easier to locate and track objects, especially with non-driven mounts, as the target drifts more slowly across your view. The optical system is engineered to maintain sharp, high-contrast star points and planetary details across the entire field, largely free of distracting lateral color or edge-of-field astigmatism, even in fast f\/ratio telescopes.\u003c\/p\u003e\n\u003cp\u003eFor the observer, this means you can study the delicate banding on Jupiter or the Cassini Division in Saturn's rings without the planet softening as it moves away from the center. The wider field provides a more immersive context, framing the target against a dark, velvety background, which makes the experience more like looking through a porthole than a keyhole.\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 Through Advanced Coatings\u003c\/h3\u003e\n\u003cp\u003eEvery air-to-glass surface in the Delos 6mm receives Tele Vue's proprietary index-matched multi-coatings, while the lens edges are meticulously blackened. This two-part approach is critical for high-magnification work, where maximizing light throughput and minimizing scatter are paramount. The coatings ensure that the maximum amount of light from the target reaches your eye, while the blackened edges prevent stray light from bouncing between elements and reducing contrast.\u003c\/p\u003e\n\u003cp\u003eThe visual result is a view with a starkly black background, allowing faint planetary details, subtle lunar crater floor textures, and the dim companions of double stars to stand out. This high signal-to-noise ratio is what separates a good view from a memorable one, especially when pushing the limits of your telescope on a night of steady seeing.\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\u003eConsistent 20mm Eye Relief for Viewing Comfort\u003c\/h3\u003e\n\u003cp\u003eOne of the defining features of the Delos series is its consistent, long 20mm eye relief. Unlike many high-power eyepieces that force you to press your eye against the lens, the Delos 6mm allows you to maintain a comfortable distance. This is a significant advantage for eyeglass wearers, who can see the entire 72° field of view without removing their glasses. For all observers, it reduces eye strain during long sessions, allowing your eye to relax and perceive more subtle details.\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 Tuning with the Locking Eyeguard\u003c\/h3\u003e\n\u003cp\u003eTo complement the long eye relief, the Delos features an adjustable, locking eyeguard. This mechanical system allows you to set the perfect distance between your eye and the top lens, effectively tuning the eyepiece to your unique facial structure and preference, with or without glasses. Once you find the sweet spot where the full field is visible without blackouts or \"kidney-beaning,\" you can lock it in place for repeatable, instant comfort every time you use it.\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 Transitions with a Parfocal Design\u003c\/h3\u003e\n\u003cp\u003eThe Delos 6mm is designed to be parfocal with the entire Delos line and most other Tele Vue 1.25\" eyepieces, such as Plössls and Panoptics. This means that when you switch from a lower-power Tele Vue eyepiece to the 6mm Delos, you will only need a minimal turn of the focus knob, if any. This practical feature saves valuable time in the field, keeping your target in sharp focus as you step up in magnification and preventing the frustration of having to re-acquire the object.\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\u003eCorrecting Astigmatism with DIOPTRX\u003c\/h3\u003e\n\u003cp\u003eFor observers with astigmatism, the Delos 6mm is threaded to accept Tele Vue's DIOPTRX correctors. This accessory attaches directly to the eyepiece, allowing you to dial in your precise astigmatism correction. The benefit is significant: you can observe without your eyeglasses, eliminating the extra glass surfaces and potential reflections, while still enjoying the sharpest possible star points your telescope can deliver. It makes the eyepiece a truly customized tool for your eyes.\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\u003eObserving with the Delos 6mm\u003c\/h3\u003e\n\u003cp\u003eOn a night of good seeing, insert the 6mm Delos into a quality 4-inch refractor to achieve around 160x. Center on the lunar crater Clavius. The view is not just a flat white disk; the high-contrast optics reveal the subtle grayscale variations in the crater floor and the crisp shadows cast by the central peaks. The 72° field allows you to take in the entire crater and its surroundings without feeling cramped, and the long eye relief lets you study the details for minutes on end without fatigue.\u003c\/p\u003e\n\u003cp\u003eThe main limitation of any high-power eyepiece is its dependence on atmospheric conditions. The 6mm focal length will deliver very high magnification in most telescopes, and if the seeing is poor, the image will appear soft or blurry. On such nights, a lower-power eyepiece will provide a more satisfying view. However, when the atmosphere is stable, the Delos 6mm provides a level of detail that makes waiting for those nights worthwhile.\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 High-Power Tele Vue Eyepiece\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several options for high-magnification observing. Understanding the trade-offs helps in making the right choice for your observing style.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Nagler Type 6 5mm:\u003c\/strong\u003e The 5mm Nagler provides a wider 82° apparent field, creating a more immersive \"spacewalk\" experience. However, it achieves this with a much shorter eye relief of 12mm, which can be difficult for eyeglass wearers. The Delos 6mm prioritizes viewing comfort with its 20mm eye relief while still offering a generous 72° field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. Plössl 8mm + 2x Barlow:\u003c\/strong\u003e A classic combination that is sharp on-axis but suffers from a narrow 50° apparent field and tight eye relief. The Delos 6mm offers a significantly wider, more comfortable, and more engaging view in a single, integrated package. Choose the Delos when field of view and comfort are as important as raw power.\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 Delos 6mm a good choice for my 8\" Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's an excellent choice. In a typical f\/6 Dobsonian, a 6mm eyepiece yields 200x magnification, a sweet spot for planetary and lunar detail. The 72° field of view provides more time to observe an object as it drifts, which is a major advantage with a non-tracking mount.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Delos 6mm compare to the Nagler 5mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Delos prioritizes viewing comfort with 20mm of eye relief, making it ideal for eyeglass wearers. The Nagler provides a wider 82° field but has a tighter 12mm eye relief. If you value comfort and wear glasses, choose the Delos; if you want the most immersive field possible and don't require long eye relief, the Nagler is a strong option.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use the Delos 6mm with a Barlow lens?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYou can, but it will result in extremely high magnification that is only usable on nights of exceptional atmospheric stability. A 2x Barlow would yield magnifications often too high for most telescopes and seeing conditions. The Delos is designed to be a primary high-power eyepiece on its own.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the main benefit of the locking eyeguard?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe locking eyeguard allows you to set the perfect eye distance to see the full field of view without blackouts. Once you find your ideal position, you can lock it, so it's perfectly set for you every time, saving adjustment time in the dark.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eDo I need DIOPTRX if I have astigmatism?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIf you have astigmatism, you can observe with your glasses on thanks to the Delos's long eye relief. However, using the DIOPTRX allows you to observe without glasses, removing extra layers of glass for a higher-contrast view and providing a perfectly sharp focus customized for your eyes.\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\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm\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\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e7.6mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoatings\u003c\/td\u003e\n\u003ctd\u003eFully index-matched multi-coatings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e1.00 lbs \/ 454 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e1.5\" D x 3.5\" H\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 (Plössl, Panoptic, Nagler, etc.)\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 Delos 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\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_Delos_6mm_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":51223878992157,"sku":"TV-EDL-06.0","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_6mm_Eyepiece_1.jpg?v=1777515020"},{"product_id":"tele-vue-delos-4-5mm-72-degree-eyepiece","title":"Tele Vue Delos 4.5mm 72° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 4.5mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 72°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eEye Relief: 20mm\u003c\/li\u003e\n\u003cli\u003eField Stop Diameter: 5.6mm\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\u003eHigh-Power Views, Without the High-Power Strain\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Delos 4.5mm 72° Eyepiece delivers high-magnification planetary, lunar, and double-star views with a level of comfort that changes the game for serious observers. It combines a sharp, high-contrast optical system with a generous 20mm of eye relief, solving the age-old problem of eye strain during detailed, high-power observation. The result is a forgiving, immersive experience that encourages longer, more productive sessions at the telescope.\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 Pure, High-Contrast Optical Path\u003c\/h3\u003e\n\u003cp\u003eThe Delos optical design uses high-index glasses and continuous multi-coatings on every air-to-glass surface to maximize light throughput and suppress internal reflections. This engineering delivers a neutral, high-fidelity image with dark sky backgrounds, allowing subtle planetary details and faint stellar companions to become visible. The color rendition is true to life, without the warm or cool tint introduced by lesser eyepieces.\u003c\/p\u003e\n\u003cp\u003eOn a target like Jupiter, this translates to seeing delicate festoons and small ovals within the cloud belts, not just the primary bands themselves. The high contrast makes it easier to discern the Cassini Division in Saturn's rings, even on nights of average seeing. This is not just a sharp eyepiece; it is a transparent window to the 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 Freedom of 20mm Eye Relief\u003c\/h3\u003e\n\u003cp\u003eHigh-power eyepieces are traditionally associated with tight, uncomfortable eye relief, forcing you to press your eye against the lens. The Delos 4.5mm breaks this rule by providing a constant 20mm of eye relief, a specification typically found only in low-power eyepieces. This design choice provides a relaxed, spacious view, which is a significant advantage for eyeglass wearers who can now see the entire field of view without removing their glasses.\u003c\/p\u003e\n\u003cp\u003eThis long eye relief also benefits observers who do not wear glasses. It eliminates the feeling of being \"crowded\" by the eyepiece, reducing fatigue and making it easier to hold a steady view for extended periods. This is particularly valuable when studying fine details that require patience and concentration, such as tracking shadow transits across a planetary disk.\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 Lockable Eyeguard and Consistent Performance\u003c\/h3\u003e\n\u003cp\u003eTo manage the long eye relief and prevent blackouts, the Delos features an innovative adjustable and lockable eyeguard. By simply twisting the housing, you can raise the soft rubber eyeguard to the exact height that positions your eye perfectly, then lock it in place. This ensures you get the same comfortable, full-field view every time you come to the eyepiece, without needing to hunt for the right position.\u003c\/p\u003e\n\u003cp\u003eThis mechanism is a practical workflow improvement. It saves time and frustration, especially when sharing the telescope with others or when switching between eyepieces. Once you find your perfect setting, it remains fixed, making the eyepiece feel like a custom-fit instrument for your eye.\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 Immersive 72° Apparent Field\u003c\/h3\u003e\n\u003cp\u003eThe 72° apparent field of view strikes a deliberate balance between a wide, immersive experience and optical purity. While not as expansive as an 82° or 100° field, the 72° frame is wide enough to feel like a \"porthole\" view, yet it allows the optical design to maintain exceptional sharpness and contrast right to the very edge of the field stop. There is no pincushion or barrel distortion, so straight lines remain straight as you pan across the lunar terminator.\u003c\/p\u003e\n\u003cp\u003eThis well-corrected field is a significant asset for planetary and lunar observers. When tracking a planet at high power, the object drifts across a consistently sharp field, giving you more time to study details before needing to adjust the mount. On a small planetary nebula like the Ring Nebula (M57), the 4.5mm Delos in a long-focus refractor will frame the nebula beautifully against a dark background, with surrounding field stars remaining perfect points.\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\u003eSuperior Contrast from Barrel to Baffle\u003c\/h3\u003e\n\u003cp\u003eTele Vue's commitment to contrast extends beyond the optics. The 1.25\" barrel is machined with a tapered undercut on the barrel, which provides a more secure connection than simple safety grooves and prevents the eyepiece from accidentally falling out of the focuser. Internally, the eyepiece features flat-blackened lens edges and baffles that are strategically placed to trap any stray light that might otherwise reduce contrast and wash out faint details.\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\u003eObserve Without Glasses with Dioptrx Compatibility\u003c\/h3\u003e\n\u003cp\u003eFor observers with astigmatism, the Delos series is fully compatible with Tele Vue's Dioptrx correctors. The top of the eyepiece is threaded to accept a Dioptrx unit, which replaces the need for eyeglasses at the telescope. This creates a direct optical path from the eyepiece to your eye, eliminating the extra reflections and potential misalignments of wearing glasses and resulting in a sharper, higher-contrast 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\u003eA Note on Seeing Conditions\u003c\/h3\u003e\n\u003cp\u003eThe Delos 4.5mm is a high-magnification instrument, and its performance is directly tied to the stability of the Earth's atmosphere. While its optical quality is superb, it cannot see through poor \"seeing.\" On nights of atmospheric turbulence, the view may appear soft or shimmering. However, its forgiving eye relief and high contrast mean that during fleeting moments of steady air, the details that snap into focus will be rendered with exceptional clarity.\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 High-Power Eyepiece: Delos vs. Nagler\u003c\/h3\u003e\n\u003cp\u003eWhen considering a high-power eyepiece, many observers weigh the Delos against the Nagler series. The choice comes down to your primary observing style.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue Delos 4.5mm:\u003c\/strong\u003e You prioritize comfort, eye relief, and the highest possible contrast for detailed planetary and double-star work. You wear glasses or simply want a more relaxed, less critical viewing experience without sacrificing optical sharpness.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTele Vue Nagler Type 6 5mm:\u003c\/strong\u003e You want the most immersive, \"spacewalk\" experience possible and are willing to trade some eye relief for a wider 82° field of view. This is often the choice for observers who want to frame objects within a larger context, such as globular clusters or small nebulae.\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 Delos 4.5mm good for a beginner?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile it is a premium eyepiece, its long eye relief and forgiving nature make it much easier to use than traditional high-power eyepieces. For a beginner with a quality telescope who wants to specialize in lunar and planetary observing, it can be an excellent long-term investment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this eyepiece work well with my f\/5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Delos line is well-corrected for fast telescopes. In an f\/5 system, the 4.5mm Delos will deliver sharp stars across the field. You will also need a coma corrector like the Tele Vue Paracorr Type 2 to achieve the best performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Delos 4.5mm compare to a 4mm planetary eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Delos 4.5mm offers a significantly wider 72° apparent field and much more comfortable eye relief than typical 4mm Orthoscopic or Plössl eyepieces. While those designs are very sharp, the Delos provides a more immersive and comfortable experience for extended viewing sessions.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy would I choose the 4.5mm Delos over the 3.5mm Delos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 4.5mm provides lower magnification, which is usable on more nights of average atmospheric seeing. The 3.5mm Delos requires very stable seeing conditions to perform at its best and is a more specialized tool for nights of exceptional atmospheric stability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the locking eyeguard for?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe long 20mm eye relief means your eye needs to be positioned at a specific distance from the lens to see the whole field without blackouts. The locking eyeguard lets you set this position perfectly for your eye (with or without glasses) and lock it there, so you get a perfect view every time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use Dioptrx with the Delos 4.5mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the Delos line is designed to be compatible with Tele Vue's Dioptrx astigmatism correctors. This allows you to observe without your glasses and achieve a perfectly sharp focus.\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\u003eEDL-04.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e4.5mm\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\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e5.6mm\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\u003e17.6 oz (1.10 lbs \/ 499 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e1.9\" D x 3.6\" H (48mm x 91mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDioptrx Compatible\u003c\/td\u003e\n\u003ctd\u003eYes\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 Delos 4.5mm 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_Delos_4.5mm_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":51223879024925,"sku":"TV-EDL-04.5","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_4.5mm_Eyepiece_1.jpg?v=1777515020"},{"product_id":"tele-vue-delos-3-5mm-72-degree-eyepiece","title":"Tele Vue Delos 3.5mm 72° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003eFocal Length: 3.5mm\u003c\/li\u003e\n\u003cli\u003eApparent Field of View: 72°\u003c\/li\u003e\n\u003cli\u003eBarrel Size: 1.25\"\u003c\/li\u003e\n\u003cli\u003eEye Relief: 20mm\u003c\/li\u003e\n\u003cli\u003eParfocal: Yes, with most Tele Vue 1.25\" eyepieces\u003c\/li\u003e\n\u003cli\u003eFilter Threads: 1.25\" Standard\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\u003eHigh-Power Views Without Compromise: The Delos 3.5mm Eyepiece\u003c\/h2\u003e\n\u003cp\u003eThe Tele Vue Delos 3.5mm 72° Eyepiece is an optical instrument designed for high-magnification planetary, lunar, and double-star observation, delivering a wide field of view without sacrificing contrast, sharpness, or viewing comfort. It combines a generous 72° apparent field with long eye relief, creating an immersive experience that feels natural and unconstrained, even at extreme magnifications. For the observer who refuses to choose between a wide, engaging view and pure, high-fidelity planetary detail, the Delos 3.5mm is a definitive solution.\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 72° Apparent Field of View\u003c\/h3\u003e\n\u003cp\u003eThe Delos optical design achieves a 72° apparent field of view, creating a viewing window that feels expansive and immersive. This wide field provides a significant advantage at high power, allowing you to track a planet across the field for longer periods on a non-driven or manually guided mount. The optical correction is maintained to the very edge of the field, ensuring stars remain sharp points and planetary limbs are free of distracting distortion or color fringing, a key performance trait for a high-power 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\u003eHigh-Contrast Optical System\u003c\/h3\u003e\n\u003cp\u003eTele Vue utilizes high-index glass elements and applies full multi-coatings to every air-to-glass surface in the Delos 3.5mm. This meticulous approach minimizes scattered light and maximizes throughput, which is critical for discerning low-contrast details at high magnification. The practical result is a darker background sky, which makes subtle features like Jupiter's faint festoons, the delicate crepe ring of Saturn, or minute tonal variations in Martian albedo features more readily visible. The blackened lens edges further enhance this effect by absorbing stray light that would otherwise reduce image contrast.\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 Locking Eyeguard and Consistent Eye Relief\u003c\/h3\u003e\n\u003cp\u003eA core feature of the Delos line is its adjustable, locking eyeguard, paired with a constant 20mm of eye relief across all focal lengths. This system allows you to set the perfect distance between your eye and the top lens, then lock it in place. This provides a stable, repeatable viewing position night after night, eliminating distracting \"blackouts\" or kidney-beaning effects. For observers who wear glasses to correct for astigmatism, the long eye relief ensures you can see the entire 72° field of view comfortably without removing 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\u003eParfocal Design for Seamless Transitions\u003c\/h3\u003e\n\u003cp\u003eThe Delos 3.5mm is designed to be nearly parfocal with other Tele Vue 1.25\" eyepieces, including other Delos, Plössls, and Panoptics. This means that when you switch from a lower-power Tele Vue eyepiece to the 3.5mm Delos for a closer look, you will need to make only a minimal adjustment to the focuser. This workflow benefit keeps your target centered and saves valuable time, especially when observing conditions are changing or you are trying to catch a moment of perfect seeing.\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 High-Magnification Experience\u003c\/h3\u003e\n\u003cp\u003eIn a quality 4-inch apochromatic refractor under steady skies, the 3.5mm Delos delivers magnifications in the 200-250x range, ideal for planetary observation. As your eye settles on Jupiter, the view is not just a magnified disk but a detailed globe. You can trace the fine, thread-like structures within the main equatorial belts and watch for transit events of the Galilean moons, whose tiny disks are cleanly resolved against the planet's clouds. The generous field means the planet drifts slowly through the view, allowing you to study features without constant nudging of the telescope.\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 Atmospheric Seeing\u003c\/h3\u003e\n\u003cp\u003eThe primary limitation of any high-power eyepiece is the Earth's atmosphere. At the magnification levels the 3.5mm Delos provides, excellent atmospheric \"seeing\" is required to realize its full potential. On nights of poor seeing, the image will appear soft or shimmering, a condition no eyepiece can correct. Therefore, this is a special-purpose eyepiece you reach for when the air is steady and you want to push your telescope to its resolution limit on the brightest targets.\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 High-Power Tele Vue Eyepiece\u003c\/h3\u003e\n\u003cp\u003eTele Vue offers several eyepiece lines that deliver high magnification. The choice depends on the observer's priorities.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDelos 3.5mm vs. Nagler Type 6 3.5mm:\u003c\/strong\u003e The Nagler offers a wider 82° apparent field, creating a more dramatic \"spacewalk\" effect. However, the Delos provides significantly more eye relief (20mm vs. 12mm), making it the superior choice for eyeglass wearers and many observers who find the longer eye relief more comfortable for extended planetary study.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDelos 3.5mm vs. DeLite 3mm\/4mm:\u003c\/strong\u003e The DeLite series is smaller, lighter, and more affordable, with a 62° apparent field. The Delos is the choice for observers who want the most immersive high-power view possible while retaining long eye relief. The DeLite is for those who prioritize portability and lower cost while still demanding excellent optical quality and comfort.\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 Delos 3.5mm good for observers who wear glasses?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. With 20mm of eye relief, the Delos 3.5mm allows most eyeglass wearers to see the full 72° field of view. The adjustable eyeguard helps you find the perfect distance for comfortable viewing with or without glasses.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat telescope is best suited for the 3.5mm Delos?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThis eyepiece is ideal for telescopes with focal lengths of 700mm or longer, such as apochromatic refractors, Schmidt-Cassegrains, and Maksutov-Cassegrains. It requires excellent atmospheric conditions to perform at its best due to the high magnification it provides.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Delos 3.5mm compare to a Nagler 3.5mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe Nagler has a wider 82° field, while the Delos has a 72° field but offers much longer and more comfortable eye relief (20mm vs 12mm). For planetary viewing, many observers prefer the comfort of the Delos, while deep-sky observers might prefer the wider field of the Nagler.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this eyepiece work on a very fast Dobsonian telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, but it will provide extremely high magnification that may exceed what the atmospheric seeing or the telescope's optics can support. It will perform best when used with a Paracorr to correct for coma inherent in fast Newtonian reflectors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat's the main trade-off with the Delos 3.5mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIts main limitation is its dependence on steady atmospheric seeing. The high power it delivers will magnify any atmospheric turbulence, so it can only be used to its full potential on nights of good to excellent seeing. It is not an all-purpose, every-night eyepiece.\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-EDL-03.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e3.5mm\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\u003e72°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e17.6 oz \/ 499 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e4.4mm\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\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes, with Tele Vue Group \"A\" eyepieces\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 Delos 3.5mm 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_Delos_3.5mm_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":51223879057693,"sku":"TV-EDL-03.5","price":613.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Tele_Vue_Delos_3.5mm_Eyepiece_1.jpg?v=1777515020"}],"url":"https:\/\/davidastro.com\/collections\/televue-delos-72-eyepieces.oembed","provider":"David Astro","version":"1.0","type":"link"}