{"title":"Celestron Ultima Edge Eyepieces","description":"\u003cp\u003eCelestron Ultima Edge eyepieces are flat-field eyepieces designed to keep stars sharp to the edge of the field, with generous eye relief for eyeglass wearers. The range includes 10mm (60°), 15mm, 18mm and 24mm (65°) in 1.25\" barrels, and a 30mm (70°) in a 2\" barrel.\u003c\/p\u003e\u003cp\u003eThey suit observers with fast telescopes or short refractors, where cheaper designs blur stars near the field edge, and they work as a coherent mid-priced set from low to medium-high power.\u003c\/p\u003e","products":[{"product_id":"celestron-ultima-edge-60-10mm-1-25","title":"Celestron Ultima Edge 60° 10mm - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e10mm Focal Length for High-Power Views\u003c\/li\u003e\n\u003cli\u003e60° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003eFlat-Field Optical Design for Edge-to-Edge Sharpness\u003c\/li\u003e\n\u003cli\u003e16mm Eye Relief for Comfortable Viewing with or without Glasses\u003c\/li\u003e\n\u003cli\u003eParfocal with Other Ultima Edge Eyepieces (excluding 24mm)\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" Barrel with Filter Threads\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\u003eCelestron Ultima Edge - 10mm Flat Field Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Ultima Edge 10mm Flat Field Eyepiece delivers an expansive 60° apparent field of view where stars remain sharp across the entire frame. Its 5-element optical design is fully multi-coated for maximum light transmission, while the generous 16mm of eye relief ensures comfortable viewing. Weighing just 80 grams and fitting a standard 1.25\" focuser, this parfocal eyepiece allows you to switch between magnifications with minimal refocusing.\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 60° Flat Field: Sharp Stars from Edge to Edge\u003c\/h3\u003e\n\u003cp\u003eThe core of the Ultima Edge design is its flat-field correction, a feature typically found in much more expensive eyepieces. This 5-element, 4-group system corrects for field curvature, ensuring that stars at the edge of the 60° apparent field of view are as sharp and point-like as those in the center. The result is a clean, immersive view free from the distracting distortion and stretched stars common in simpler designs, especially in faster telescopes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003e10mm High-Power Views for Planetary and Lunar Detail\u003c\/h3\u003e\n\u003cp\u003eWith a 10mm focal length, this eyepiece provides high magnification for resolving fine details on celestial objects. It is an ideal choice for examining the cloud bands of Jupiter, the rings of Saturn, and the intricate craters and rilles on the Moon's surface. The fully multi-coated optics ensure these bright targets are rendered with high contrast and without false color, allowing you to push the limits of your telescope's resolving power on nights 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\u003eBuilt for Observing: 16mm Eye Relief and Secure Grip\u003c\/h3\u003e\n\u003cp\u003eViewing comfort is critical during long sessions, and the Ultima Edge 10mm delivers with 16mm of eye relief. This distance is sufficient for most observers to see the full field of view with their eyeglasses on, while the fold-down rubber eyeguard helps non-eyeglass wearers position their eye correctly and block stray light. The machined aluminum body is lightweight at only 80 g, and a molded rubber grip ring ensures secure, non-slip handling even with cold hands or gloves.\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 by Design: Less Focusing, More Observing\u003c\/h3\u003e\n\u003cp\u003eThe Ultima Edge eyepiece line is designed to be parfocal, meaning you can swap between different focal lengths in the series and the image will remain nearly in focus. This saves valuable time at the telescope, eliminating the need for major focus adjustments when changing magnification. You can switch from a low-power Ultima Edge for locating an object to the 10mm for a detailed view with only a minor touch-up to the focus knob, keeping your target centered and your session moving smoothly.\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\u003eUltima Edge 10mm vs. a Standard 10mm Plössl\u003c\/h3\u003e\n\u003cp\u003eWhile a standard Plössl is a workhorse eyepiece, the Ultima Edge provides distinct advantages for the critical observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Curvature:\u003c\/strong\u003e A standard Plössl will typically show sharp stars only in the central 50-60% of the field, with stars becoming progressively less sharp towards the edge. The Ultima Edge's flat-field design maintains pinpoint stars across the entire 60° view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApparent Field of View:\u003c\/strong\u003e The Ultima Edge's 60° AFOV feels more immersive than the typical 50-52° field of a Plössl, providing a wider, more contextual window on your target.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e With 16mm of eye relief, the Ultima Edge is significantly more comfortable for eyeglass wearers than most 10mm Plössls, which often have eye relief of 8mm or less.\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 Ultima Edge 10mm good for planetary viewing in a Schmidt-Cassegrain telescope?\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 8\" f\/10 SCT, the 10mm focal length yields 203x magnification, which is ideal for resolving details on Jupiter, Saturn, and Mars on nights with good atmospheric stability. The flat-field design ensures the planet remains sharp even as it drifts across the field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Ultima Edge 10mm perform on deep-sky objects?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 10mm provides high magnification that is perfect for smaller deep-sky objects like planetary nebulae such as the Ring Nebula (M57) or the Dumbbell Nebula (M27). It's also effective for resolving individual stars in tight globular clusters like the Hercules Cluster (M13). The flat field keeps the entire cluster sharp from core to edge.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for the Ultima Edge series?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBeing parfocal means you can switch between most eyepieces in the Ultima Edge series (for example, from the 18mm to the 10mm) and your telescope will stay focused. This is a major convenience, especially for tracking objects. Note that the 24mm Ultima Edge is the only one in the series that is not parfocal with the others.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use 1.25\" filters with the Ultima Edge 10mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel is internally threaded to accept standard 1.25\" astronomy filters. You can easily attach a Moon filter, a light pollution filter, or colored planetary filters to enhance your view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I need to wear my glasses with the Ultima Edge 10mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith 16mm of eye relief, most eyeglass wearers can comfortably see the entire 60° field of view while keeping their glasses on. If you only have astigmatism, you will need to wear your glasses for the sharpest possible view. If you are only nearsighted or farsighted, you can typically observe without glasses and simply refocus the telescope.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of a flat-field eyepiece in a fast telescope like a Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn fast telescopes (f\/4 to f\/6), field curvature is much more pronounced, causing stars at the edge of the view in standard eyepieces to appear elongated or out of focus. The Ultima Edge 10mm corrects for this, providing a sharp, satisfying view across the entire field, which is a significant upgrade for Dobsonian users.\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\u003e10mm (.39\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e60°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e16mm (.63\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eWide-field Flat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Groups\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e14.7mm (.58\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes (within Ultima Edge series, except 24mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (standard 1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Guard\u003c\/td\u003e\n\u003ctd\u003eYes - Fold down\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e58mm x 36.5mm x 36.5mm (2.28\" x 1.44\" x 1.44\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e2.82 oz (80 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Celestron Ultima Edge 10mm Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-Ultima-Edge-10mm-Eyepiece-1.jpg?v=1782255011\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eUltima Edge 10mm Flat Field Eyepiece - 1.25\"\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Top dust cap for 1.25-inch eyepieces\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-1point25-inch-Top-Cap-1.jpg?v=1782255011\"\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\u003cimg class=\"DAV-img-box\" alt=\"Bottom dust cap for 1.25-inch eyepieces\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-1point25-inch-Bottom-Cap-1.jpg?v=1782255011\"\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\/Celestron_Ultima_Edge_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\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967732248861,"sku":"CEL-93450","price":153.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Ultima-Edge-10mm-93450-1__66104.1602295963.1280.1280.jpg?v=1684345642"},{"product_id":"celestron-ultima-edge-65-15mm-1-25","title":"Celestron Ultima Edge 65° 15mm - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e65° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e15mm Focal Length for higher-power magnification\u003c\/li\u003e\n\u003cli\u003eFlat-field design for sharp stars edge-to-edge\u003c\/li\u003e\n\u003cli\u003e16mm eye relief for comfortable viewing with or without glasses\u003c\/li\u003e\n\u003cli\u003eParfocal with other Ultima Edge eyepieces (excluding 24mm)\u003c\/li\u003e\n\u003cli\u003eStandard 1.25\" barrel threaded for filters\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\u003eCelestron Ultima Edge 15mm Flat Field Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Ultima Edge 15mm Eyepiece delivers an ultra-sharp, flat-field image across its entire 65° apparent field of view using a complex 8-element optical design. Its 15mm focal length provides higher-powered views ideal for resolving detail on planets and the Moon's surface, while the 16mm of eye relief ensures viewing comfort. The entire eyepiece weighs just 5.18 oz, making it a lightweight addition to your kit.\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 8-Element Flat-Field Optical System\u003c\/h3\u003e\n\u003cp\u003eThe Ultima Edge design uses an 8-element, 5-group lens configuration to correct for optical aberrations that typically soften stars at the edge of the field. This flat-field correction means you get sharp, pinpoint stars from the center all the way to the 19.6mm field stop. Fully multi-coated optics maximize light transmission, delivering bright, high-contrast views of faint deep-sky objects and subtle planetary 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\u003eA 65° Apparent Field for Mid-Power Views\u003c\/h3\u003e\n\u003cp\u003eWith a 65° apparent field of view, the Ultima Edge 15mm offers an immersive window that feels significantly wider than a standard Plössl without the extreme distortions of some ultra-wide designs. This focal length is a workhorse for many telescopes, providing enough magnification to resolve globular clusters like the Hercules Cluster (M13) or see cloud bands on Jupiter, while still being wide enough to frame smaller nebulae and 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\u003e16mm Eye Relief and Parfocal Design\u003c\/h3\u003e\n\u003cp\u003eComfort is critical during long observing sessions, and the Ultima Edge 15mm provides 16mm of eye relief, allowing most eyeglass wearers to see the entire field of view. The fold-down rubber eyeguard helps position your eye correctly and blocks stray light. As a parfocal eyepiece, it allows you to switch between most other focal lengths in the Ultima Edge series with little to no refocusing, saving valuable time when observing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eParfocal Convenience:\u003c\/strong\u003e Swap between different magnifications quickly without losing focus, ideal for tracking objects or comparing views at different image scales.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight Body:\u003c\/strong\u003e Machined from high-grade aluminum, the eyepiece weighs only 5.18 oz (147 g), preventing balance issues on most telescopes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Ready:\u003c\/strong\u003e The 1.25\" barrel is threaded to accept standard astronomy filters for enhancing views of nebulae or reducing glare from the Moon.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUltima Edge 15mm vs. Low-Power Models: Magnification vs. Field\u003c\/h3\u003e\n\u003cp\u003eChoosing an eyepiece is about finding the right balance for your target. While a lower-power eyepiece like the 24mm Ultima Edge provides a wider true field of view for scanning large star fields, the 15mm model offers a distinct advantage for smaller targets.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCelestron Ultima Edge 15mm:\u003c\/strong\u003e Delivers higher magnification, making it the superior choice for resolving fine details. This is the eyepiece for splitting tight double stars, observing craters along the Moon's terminator, or studying the Galilean moons as they transit Jupiter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower-Power Ultima Edge Eyepieces:\u003c\/strong\u003e These are better suited for framing large objects like the Andromeda Galaxy (M31) or the Orion Nebula (M42) in their entirety. However, they will not provide the image scale needed to see the finer structures that the 15mm can reveal.\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 Ultima Edge 15mm good for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 15mm focal length is excellent for planetary observing in many telescopes. Its flat-field design ensures that planets remain sharp even if they drift toward the edge of the field, and the 65° apparent field of view provides a comfortable amount of space around the object.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Ultima Edge 15mm perform in a fast f\/5 Dobsonian?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 8-element, flat-field design of the Ultima Edge 15mm is specifically engineered to perform well in telescopes with fast focal ratios. Unlike simpler eyepieces that can show significant coma and astigmatism away from the center, the Ultima Edge maintains sharp star points across the field in instruments like f\/5 Dobsonians.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"parfocal\" mean for the Ultima Edge 15mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBeing \u003cstrong\u003eparfocal\u003c\/strong\u003e means this eyepiece requires little to no refocusing when swapped with other eyepieces in the Ultima Edge line (with the exception of the 24mm model). This is a major convenience, allowing you to change magnification quickly without having to spend time finding focus again.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I be able to see the whole 65° field with my glasses on with the Ultima Edge 15mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWith \u003cstrong\u003e16mm of eye relief\u003c\/strong\u003e, most eyeglass wearers can comfortably see the entire 65° field of view. The fold-down rubber eyeguard can be adjusted to help you find the optimal distance for your eyes, whether you wear glasses or not.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Celestron Ultima Edge 15mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel of the Ultima Edge 15mm is threaded to accept all standard 1.25\" astronomical filters, such as moon filters, light pollution filters, or narrowband nebula filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Ultima Edge 15mm waterproof?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, the eyepiece is not rated as waterproof. While it is durable enough for regular use outdoors, you should protect it from rain and store it in a dry place to prevent moisture from getting inside the housing.\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\u003e15mm (.60\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e65°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e16mm (.63\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003e8-element Flat-Field\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Groups\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e19.6mm (.77\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes (within Ultima Edge series, excl. 24mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (standard 1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Guard\u003c\/td\u003e\n\u003ctd\u003eYes, Fold-down rubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e70mm x 45mm x 45mm (2.75\" x 1.77\" x 1.77\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e5.18 oz (147 g)\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\"\u003eUltima Edge 15mm 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:\/\/www.celestron.com\/pages\/drivers-and-software\" target=\"_blank\"\u003e\u003csvg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewbox=\"0 0 640 512\" class=\"DAV-img-box\"\u003e\u003cpath fill=\"#0047a7\" d=\"M128 32C92.7 32 64 60.7 64 96l0 256 64 0 0-256 384 0 0 256 64 0 0-256c0-35.3-28.7-64-64-64L128 32zM19.2 384C8.6 384 0 392.6 0 403.2C0 445.6 34.4 480 76.8 480l486.4 0c42.4 0 76.8-34.4 76.8-76.8c0-10.6-8.6-19.2-19.2-19.2L19.2 384z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e \n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDownload Software \u0026amp; Manuals\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\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967732314397,"sku":"CEL-93451","price":222.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Ultima-Edge-15mm-93451-1__71543.1602296574.1280.1280.jpg?v=1684345646"},{"product_id":"celestron-ultima-edge-65-18mm-1-25","title":"Celestron Ultima Edge 65° 18mm - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e18mm Focal Length\u003c\/li\u003e\n\u003cli\u003e65° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003eFlat-Field 8-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e20mm Long Eye Relief\u003c\/li\u003e\n\u003cli\u003eParfocal with other Ultima Edge Eyepieces\u003c\/li\u003e\n\u003cli\u003eAccepts Standard 1.25\" Filters\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\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\u003eCelestron Ultima Edge 18mm Flat Field Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Ultima Edge 18mm eyepiece delivers an ultra-sharp, flat-field image across its entire 65° apparent field of view. Its 8-element optical design and 20mm of eye relief provide crisp, comfortable views, while the parfocal design allows for rapid magnification changes without refocusing. Weighing just 7.4 oz, this eyepiece uses a standard 1.25\" barrel threaded for filters, making it a versatile addition to any observer's kit.\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\u003e8-Element Flat-Field Optics: Edge-to-Edge Sharpness\u003c\/h3\u003e\n\u003cp\u003eThe Ultima Edge 18mm uses a sophisticated 8-element, 5-group lens design to eliminate field curvature, ensuring stars remain sharp pinpoints from the center of the view right to the edge of the 23.4mm field stop. Unlike simpler eyepieces that can show distorted stars near the periphery, this flat-field design delivers a pristine, corrected image across the entire frame. Fully multi-coated optics maximize light transmission for brighter, higher-contrast views of planets, star clusters, and the Moon's surface.\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\u003e65° Field of View at 18mm: Comfortable Medium-Power Views\u003c\/h3\u003e\n\u003cp\u003eWith a generous 65° apparent field of view, the Ultima Edge 18mm provides an immersive window that feels significantly wider than a standard Plössl. This focal length is ideal for medium-to-high magnification, perfect for examining crater details on the Moon, resolving globular clusters, or framing planets and their moons. The substantial 20mm of eye relief, combined with a fold-down rubber eyeguard, ensures comfortable viewing for all observers, including those who wear eyeglasses.\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 by Design: Effortless Magnification Changes\u003c\/h3\u003e\n\u003cp\u003eThe Ultima Edge eyepiece line is designed to be parfocal, meaning you can swap between different focal lengths in the series with little to no refocusing required. This saves valuable time at the telescope, allowing you to switch from a wide-field view to a high-power view almost instantly. The main body is machined from high-grade aluminum and features a molded rubber grip for secure handling, while the 1.25\" barrel is threaded for standard astronomy filters.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUltima Edge 18mm vs. Standard Plössl Eyepieces\u003c\/h3\u003e\n\u003cp\u003eWhile a classic Plössl eyepiece is a simple and effective design, the Ultima Edge 18mm offers several distinct advantages for the critical observer.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eField Curvature:\u003c\/strong\u003e A standard Plössl will exhibit noticeable field curvature, where stars at the edge of the field appear out of focus compared to the center. The Ultima Edge's flat-field design corrects this aberration, providing a sharp view across the entire field.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApparent Field of View:\u003c\/strong\u003e At 65°, the Ultima Edge offers a much wider and more immersive apparent field than the typical 50-52° of a Plössl, allowing you to see more of the sky at the same magnification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEye Relief:\u003c\/strong\u003e The 20mm of eye relief on the Ultima Edge is significantly longer than that of a typical 18mm Plössl, making it far more comfortable for observers who wear glasses.\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\"\u003eWhat does a \"flat-field\" eyepiece like the Ultima Edge 18mm do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA flat-field eyepiece corrects for the optical aberration known as field curvature, which can make stars at the edge of the view appear out of focus or distorted. The Ultima Edge 18mm is designed to deliver a sharp, focused image from the center all the way to the edge of its 65° field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Ultima Edge 18mm good for viewing planets like Jupiter in a Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, the 18mm focal length provides medium-high magnification that is excellent for planetary viewing in a typical f\/10 Schmidt-Cassegrain Telescope (SCT). The flat field will ensure that Jupiter's moons (the Galilean satellites) are as sharp as the planet itself, even when they are near the edge of the field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Ultima Edge 18mm perform on open clusters like the Pleiades (M45) with a fast refractor?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a fast telescope (f\/5-f\/7), the benefits of the flat-field design are even more pronounced. The Ultima Edge 18mm will keep the stars of an open cluster like the Pleiades sharp across the entire 65° field, avoiding the distracting \"seagull\" shaped stars (astigmatism) that can appear at the edges in simpler eyepiece designs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does it mean that the Ultima Edge eyepieces are \"parfocal\"?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eBeing parfocal means that you can switch between different eyepieces in the Ultima Edge series and they will remain in focus. This saves time and makes observing more efficient, as you don't have to make major adjustments to your telescope's focuser every time you change magnification. Note that the 24mm Ultima Edge is not parfocal with the rest of the series.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Ultima Edge 18mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" mounting barrel is internally threaded to accept all standard 1.25\" astronomical filters, such as moon filters, nebula filters, or color filters for planetary observing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 20mm eye relief on the Ultima Edge 18mm suitable for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. With 20mm of eye relief, most eyeglass wearers can comfortably see the entire 65° field of view without having to press their glasses against the eyepiece. The fold-down rubber eyeguard also helps to set the correct distance and block stray light.\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\u003e18mm (.71\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e65°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eFlat-field\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Groups\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e20mm (.78\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eYes (within Ultima Edge series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e23.4mm (.93\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Guard\u003c\/td\u003e\n\u003ctd\u003eYes, Fold-down\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e81mm x 51mm x 51mm (3.19\" x 2\" x 2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e7.4 oz (209.7 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eNo\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\"\u003eUltima Edge 18mm 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\"\u003eDust Caps\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 2\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThis product is covered by Celestron's 2-Year Limited Warranty. For complete details, please visit the manufacturer's website.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967732347165,"sku":"CEL-93452","price":236.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Ultima-Edge-18mm-93452-1__61565.1602434547.1280.1280.jpg?v=1684345650"},{"product_id":"celestron-ultima-edge-65-24mm-1-25","title":"Celestron Ultima Edge 65° 24mm - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e24mm Focal Length in a 1.25\" Barrel\u003c\/li\u003e\n\u003cli\u003e65° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003eFlat-Field 8-Element Optical Design\u003c\/li\u003e\n\u003cli\u003e29mm of Eye Relief for Eyeglass Wearers\u003c\/li\u003e\n\u003cli\u003eThreaded to Accept Standard 1.25\" Filters\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\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\u003eCelestron Ultima Edge 24mm Flat Field Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Ultima Edge 24mm eyepiece delivers an expansive 65° apparent field of view using a sophisticated 8-element optical design. Its generous 29mm of eye relief ensures comfortable viewing for all observers, while the 30.2mm field stop provides a wide, well-defined window on the sky. This flat-field eyepiece is engineered to render stars as sharp points from the center of the view all the way to the edge, weighing in at a solid 12.32 oz.\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 65° Flat-Field View From 8 Lens Elements\u003c\/h3\u003e\n\u003cp\u003eThe core purpose of the Ultima Edge design is to eliminate field curvature, an aberration that causes stars near the edge of the view to appear out of focus. By utilizing an advanced 8-element lens system, this 24mm eyepiece projects a flat focal plane, ensuring that objects across the entire 65° apparent field are equally sharp. This is a critical advantage when observing open star clusters like the Pleiades (M45) or scanning the lunar terminator, where edge-to-edge clarity reveals fine details that would otherwise be lost.\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\u003e29mm Eye Relief and All-Aluminum Body\u003c\/h3\u003e\n\u003cp\u003eWith an exceptional 29mm of eye relief, the Ultima Edge 24mm is ideal for observers who wear eyeglasses. This long eye relief allows you to see the entire field of view comfortably without having to press your eye against the lens. The eyepiece body is machined from high-grade aluminum, giving it a durable, premium feel, and features a molded rubber grip for secure handling in the dark. At 12.32 oz, its heft is a direct result of the substantial glass required for its flat-field optical correction.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFold-Down Eye Guard:\u003c\/strong\u003e The soft rubber eyeguard can be used up to block stray light or folded down for use with eyeglasses, providing maximum comfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25\" Barrel:\u003c\/strong\u003e The mounting barrel is compatible with any 1.25\" focuser or star diagonal and is threaded to accept standard 1.25\" astronomy filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Multi-Coated Optics:\u003c\/strong\u003e All 8 lens elements are fully multi-coated to maximize light transmission and contrast, ensuring bright, clear images of faint deep-sky objects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eUltima Edge 24mm vs. Standard Plössl Designs\u003c\/h3\u003e\n\u003cp\u003eWhile a traditional Plössl eyepiece is a versatile workhorse, its simpler 4-element design does not correct for field curvature. In many telescopes, this results in stars becoming progressively less sharp as you look away from the center of the field. The Ultima Edge 24mm directly addresses this limitation.\u003c\/p\u003e\n\u003cp\u003eThe trade-off for this superior optical correction is complexity and weight; the 8-element Ultima Edge is heavier and more substantial than a typical 24mm Plössl. However, for the observer who demands consistent sharpness across the entire frame, especially when studying wide star fields or lunar landscapes, the flat-field view is a decisive upgrade.\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\"\u003eWhat is the main advantage of the Ultima Edge 24mm's \"flat-field\" design?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe primary advantage is \u003cstrong\u003eedge-to-edge sharpness\u003c\/strong\u003e. In many eyepieces, stars at the edge of the field of view can appear slightly out of focus or elongated (an effect of field curvature). The Ultima Edge 24mm uses an 8-element optical design to correct this, ensuring stars remain tight, sharp points across the entire 65° field.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow does the Ultima Edge 24mm perform on the Orion Nebula (M42) in a Schmidt-Cassegrain telescope?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" f\/10 SCT, the 24mm focal length provides a moderate magnification (around 85x) and a wide true field of view, perfectly framing the entirety of the Orion Nebula (M42) and its surrounding nebulosity. The flat-field design ensures that the stars of the Trapezium at the center are just as sharp as the stars in the outer wisps of the nebula.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 29mm eye relief on the Ultima Edge 24mm good for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes, it's exceptional. The 29mm eye relief is considered very long and allows eyeglass wearers to comfortably see the entire 65° field of view without removing their glasses. You can simply fold down the rubber eyeguard for an unobstructed view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Celestron Ultima Edge 24mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The 1.25\" barrel is internally threaded to accept standard 1.25\" astronomy filters, such as Moon filters, nebula filters (UHC, O-III), or light pollution filters. This makes it a versatile eyepiece for enhancing views of various celestial objects.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy is the Ultima Edge 24mm heavier than a standard eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe weight of 12.32 oz (349.3 g) is due to its complex optical design. Achieving a flat field requires 8 lens elements, which means significantly more glass than the 4 or 5 elements found in simpler designs. The body is also constructed from durable aluminum, adding to its solid feel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Celestron Ultima Edge 24mm a good choice for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile the 24mm focal length provides relatively low power for detailed planetary observation, it's excellent for locating planets and viewing them within the context of their moons or nearby stars. The sharp, high-contrast optics will provide a pleasing view, but a shorter focal length eyepiece would be needed to see fine details like Jupiter's cloud bands or Saturn's Cassini Division.\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\u003e24mm (.94\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e65°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25\" (31.75mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e29mm (1.14\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eFlat-Field\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Lens Elements\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of Lens Groups\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e30.2mm (1.19\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (Standard 1.25\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Guard\u003c\/td\u003e\n\u003ctd\u003eYes, Fold-down\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e104mm x 60mm x 60mm (4.1\" x 2.36\" x 2.36\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e12.32 oz (349.3 g)\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\"\u003eUltima Edge 24mm 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\"\u003eDust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Limited Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967732379933,"sku":"CEL-93453","price":361.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Ultima-Edge-24mm-93453-1__26520.1602542506.1280.1280.jpg?v=1684345655"},{"product_id":"celestron-ultima-edge-70-30mm-2","title":"Celestron Ultima Edge 70° 30mm - 2\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e30mm focal length provides low-power, wide true-field views\u003c\/li\u003e\n\u003cli\u003e70° apparent field of view frames large celestial objects\u003c\/li\u003e\n\u003cli\u003eFlat-field optical design ensures sharp stars from center to edge\u003c\/li\u003e\n\u003cli\u003e22mm of eye relief offers comfortable viewing for eyeglass wearers\u003c\/li\u003e\n\u003cli\u003e9-element, 5-group optics are fully multi-coated for maximum light transmission\u003c\/li\u003e\n\u003cli\u003eStandard 2\" barrel is threaded for filters\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\u003eCelestron Ultima Edge 70° 30mm Flat Field Eyepiece - 2\"\u003c\/h2\u003e\n\u003cp\u003eThe Celestron Ultima Edge 70° 30mm eyepiece corrects for field curvature, delivering sharp stars across its entire 70° apparent field of view. Its 9-element, 5-group optical system is fully multi-coated to maximize light transmission, while the generous 22mm of eye relief ensures viewing comfort. The 2\" barrel and 30.4mm field stop are engineered to provide expansive, low-power views of deep-sky objects.\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 70° View: 9 Elements for Edge-to-Edge Sharpness\u003c\/h3\u003e\n\u003cp\u003eThe core of the Ultima Edge 30mm is its flat-field optical design, which eliminates the distortion and field curvature common in conventional eyepieces. This complex 9-element, 5-group system ensures that stars remain tight, pinpoint sources of light from the center of the view right to the 30.4mm field stop. The result is an immersive 70° field that feels sharp and consistent across its entire expanse, allowing you to appreciate star clusters and nebulae without distracting aberrations at the periphery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eMaximum True Field: The 30mm Advantage for Deep-Sky Objects\u003c\/h3\u003e\n\u003cp\u003eWith its 30mm focal length, this eyepiece is designed to deliver your telescope's widest possible true field of view in a 2\" format. This low-power magnification is ideal for framing large deep-sky targets like the Andromeda Galaxy (M31) or the North American Nebula (NGC 7000) in their entirety. It also serves as an excellent \"finder\" eyepiece, making it easier to locate targets before switching to higher magnifications.\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\u003eObserver-Focused Design: 22mm Eye Relief and 2\" Filter Threads\u003c\/h3\u003e\n\u003cp\u003eComfort is critical during long observing sessions, and the Ultima Edge 30mm provides a generous 22mm of eye relief. This allows eyeglass wearers to see the entire 70° field of view without removing their glasses. The machined aluminum body features a non-slip rubber grip for secure handling, and the 2\" barrel is threaded to accept standard 2\" nebula and light pollution filters, a crucial feature for enhancing contrast on faint deep-sky objects.\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\u003ePractical Considerations: Weight, Balance, and Focusing\u003c\/h3\u003e\n\u003cp\u003eWeighing in at 674.7 g (23.8 oz), the Ultima Edge 30mm is a substantial eyepiece that requires proper counterbalancing, especially on smaller mounts. Its robust construction contributes to its optical stability. This eyepiece is not parfocal, meaning you will need to readjust focus when swapping it with other eyepieces in your collection, a minor trade-off for its edge-to-edge optical correction.\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\"\u003eWhat is a \"flat-field\" eyepiece and why does it matter for the Ultima Edge 30mm?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eA flat-field eyepiece, like the Ultima Edge 30mm, uses a complex optical design with \u003cstrong\u003e9 lens elements\u003c\/strong\u003e to correct for field curvature. This means stars at the edge of the \u003cstrong\u003e70° field of view\u003c\/strong\u003e appear as sharp pinpoints, not stretched or blurred, providing a more natural and immersive view of star fields and large objects like the Pleiades (M45).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the Ultima Edge 30mm good for viewing planets?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eWhile designed for wide-field, deep-sky views, the Ultima Edge 30mm can be used for planets. However, its low magnification is not ideal for resolving fine detail on Jupiter or Saturn. Its primary strength lies in framing large objects, not high-magnification planetary observation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the Ultima Edge 30mm perform in my 8\" f\/10 Schmidt-Cassegrain?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn a typical 8\" (2032mm focal length) SCT, the Ultima Edge 30mm eyepiece will provide a magnification of 68x and a true field of view of about 1 degree—twice the width of the full Moon. This is an excellent combination for sweeping the Milky Way and observing large open clusters like the Beehive Cluster (M44).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eCan I use filters with the Ultima Edge 30mm eyepiece?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The \u003cstrong\u003e2\" (50.8mm) barrel\u003c\/strong\u003e is internally threaded to accept standard 2\" astronomy filters. This is especially useful for threading in a UHC or OIII filter to enhance the contrast of emission nebulae like the Orion Nebula (M42).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the 22mm eye relief on the Ultima Edge 30mm suitable for eyeglass wearers?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eAbsolutely. The \u003cstrong\u003e22mm of eye relief\u003c\/strong\u003e is considered very long and provides ample space between the eyepiece lens and your eye. This allows observers who wear glasses for astigmatism to see the entire 70° field of view comfortably without vignetting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eThe Ultima Edge 30mm is listed as not parfocal. What does this mean for observing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\"Not parfocal\" means that if you switch from this eyepiece to another one, you will have to significantly adjust your telescope's focuser to get a sharp image again. It's a minor operational step to be aware of when planning your observing sequence.\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\u003e30mm (1.18\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e70°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e2\" (50.8mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e22mm (.87\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eWide-field Flat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Elements\u003c\/td\u003e\n\u003ctd\u003e9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Groups\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Coatings\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e30.4mm (1.2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eParfocal\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eYes (2\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Guard\u003c\/td\u003e\n\u003ctd\u003eYes, Fold Down\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWaterproof\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e116mm x 60mm x 60mm (4.57\" x 2.36\" x 2.36\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e23.8 oz (674.7 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Celestron Ultima Edge 30mm Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Ultima-Edge-30mm-Eyepiece-1.jpg?v=1776997631\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eUltima Edge 30mm Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Top Dust Cap for 2-inch Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-2-inch-Dust-Cap-Top.jpg?v=1776997873\"\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\u003cimg class=\"DAV-img-box\" alt=\"Bottom Dust Cap for 2-inch Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Celestron-2-inch-Dust-Cap-Bottom.jpg?v=1776997873\"\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\/Celestron_Ultima_Edge_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 Ultima Edge Eyepiece 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\u003ca href=\"https:\/\/davidastro.com\/pages\/celestron-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eCelestron 2-Year Warranty\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":44967732445469,"sku":"CEL-93454","price":417.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/products\/Celestron-Ultima-Edge-30mm-93454-1__97072.1602542987.1280.1280.jpg?v=1684345659"}],"url":"https:\/\/davidastro.com\/en-us\/collections\/celestron-ultima-edge-eyepieces.oembed","provider":"David Astro","version":"1.0","type":"link"}