{"product_id":"televue-plossl-40mm-43-eyepiece","title":"TeleVue Plössl 40mm 43° Eyepiece - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Focal Length\u003c\/li\u003e\n\u003cli\u003e43° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Diameter Barrel\u003c\/li\u003e\n\u003cli\u003e28mm Eye Relief\u003c\/li\u003e\n\u003cli\u003e27mm 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\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\u003eTeleVue Plössl 40mm 43° Eyepiece - 1.25\"\u003c\/h2\u003e\n\u003cp\u003eThe TeleVue Plössl 40mm is the maximum focal length achievable within the 1.25-inch barrel format. By utilizing a 27mm field stop, this eyepiece provides the widest possible true field of view for any 1.25\" focuser, making it an indispensable tool for owners of small refractors, Maksutovs, and SCTs who require a low-power \"finder\" or rich-field experience.\u003c\/p\u003e\n\u003cp\u003eWhile many generic 40mm Plössls suffer from internal reflections and soft edges, TeleVue’s execution is a masterclass in optical discipline. It is designed to deliver high-contrast, diffraction-limited images that maintain the integrity of the Al Nagler signature: sharpness from center to edge.\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 Limit of the 1.25\" Format\u003c\/h3\u003e\n\u003cp\u003eThe true field of view in an eyepiece is physically constrained by the inner diameter of the barrel. With a 27mm field stop, the TeleVue 40mm Plössl hits the absolute wall of what is possible in a 1.25\" accessory. While it features a narrower 43° apparent field compared to the 32mm Plössl (50°), both eyepieces show the exact same amount of sky. The 40mm choice is specifically for those who prioritize a larger exit pupil and greater eye relief over apparent field width.\u003c\/p\u003e\n\u003cp\u003eFor observers using f\/10 or f\/12 instruments, the 40mm focal length provides the necessary exit pupil to keep images bright when hunting faint, extended objects like the North American Nebula or M31, where every photon counts.\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 and Optical Coatings\u003c\/h3\u003e\n\u003cp\u003eTeleVue’s Plössl design uses high-index glass and proprietary multi-coatings to ensure maximum light transmission. In a four-element design, the reduction of air-to-glass surfaces minimizes scattering, providing a \"jet-black\" background that enhances the visibility of low-contrast deep-sky structures.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Correction:\u003c\/strong\u003e TeleVue Plössls are specifically corrected for astigmatism and aberrations at the edge of the field, even in faster focal ratios, though they truly excel in telescopes of f\/6 and slower.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiffraction-Limited Performance:\u003c\/strong\u003e This is not a \"budget\" Plössl. It is built to the same exacting standards as the Delos or Nagler series, ensuring the 40mm focal length doesn't introduce unwanted flare or ghosting.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChrome-Plated Barrels:\u003c\/strong\u003e Precision-machined barrels with safety undercuts ensure the eyepiece sits securely and square in the optical axis, maintaining collimation integrity.\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\u003eExceptional Comfort for Eyeglass Wearers\u003c\/h3\u003e\n\u003cp\u003eWith 28mm of eye relief, the 40mm Plössl is one of the most comfortable eyepieces in the TeleVue catalog. If you suffer from astigmatism and must observe with your glasses on, this eyepiece allows you to see the entire field stop without pressing your lenses against the rubber guard.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDioptrx Compatibility:\u003c\/strong\u003e The 40mm Plössl is fully compatible with the TeleVue Dioptrx system. This allows you to attach a professional-grade astigmatism corrector directly to the eyepiece, finally allowing you to observe without spectacles while maintaining a perfect point-spread function.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Eye Guard:\u003c\/strong\u003e To prevent stray light and help position the eye for those not wearing glasses, the eyepiece features a fold-down rubber eyeguard that assists in maintaining the proper exit pupil distance.\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\u003eTechnical Trade-offs: 40mm vs. 32mm\u003c\/h3\u003e\n\u003cp\u003eA common question among experienced observers is whether to choose the 32mm or 40mm Plössl. Since both share the 27mm field stop, the true field of view is identical.\n\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 40mm Advantage:\u003c\/strong\u003e Provides a 25% larger exit pupil. This makes the image appear brighter in slow telescopes (f\/10+) and is often preferred for use with narrow-band filters (OIII, H-Beta).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe 32mm Advantage:\u003c\/strong\u003e Provides higher magnification and a wider 50° apparent field, which darkens the sky background—a benefit for city-dwelling observers battling light pollution.\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\"\u003eDoes the TeleVue 40mm Plössl show more sky than the 32mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo. The TeleVue 40mm Plössl and a 32mm Plössl both use the maximum field stop possible in a 1.25\" barrel, so they show essentially the same True Field of View. The 40mm provides lower magnification and a brighter image, while the 32mm offers a more immersive apparent field.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy choose the TeleVue 40mm Plössl instead of a 32mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe TeleVue 40mm Plössl produces a brighter image due to its larger exit pupil, making it ideal for nebula filters and long focal ratio telescopes such as SCTs, Maksutovs, and refractors. A 32mm Plössl is often preferred for general observing because of its wider apparent field.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill I see the secondary mirror shadow with the TeleVue 40mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn fast telescopes (f\/4 to f\/5) or during daytime use, the large exit pupil of the TeleVue 40mm Plössl can exceed your eye’s pupil, making the secondary mirror shadow visible. This is rarely an issue at night with slower systems like f\/10 SCTs.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhy does the TeleVue 40mm Plössl have a 43° field of view?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 1.25\" barrel format limits the maximum field size. At a 40mm focal length, the TeleVue 40mm Plössl must use a narrower apparent field to avoid vignetting. Wider views at this focal length require a 2\" eyepiece.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the TeleVue 40mm Plössl good for imaging or night vision?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The long eye relief of the TeleVue 40mm Plössl makes it easy to position a camera for afocal imaging. It is also commonly used in night vision setups where a compact 1.25\" format is preferred.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow do I manage the long eye relief of the TeleVue 40mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe TeleVue 40mm Plössl has very long eye relief, which is excellent for eyeglass wearers but can make eye placement sensitive. If you experience blackouts or difficulty positioning your eye, adding an eyeguard extender such as the EGE-0020 helps set the correct eye distance and improves viewing comfort.\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\u003eEPL-40.0\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e40 mm\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\u003e43°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEye Relief\u003c\/td\u003e\n\u003ctd\u003e28 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eField Stop Diameter\u003c\/td\u003e\n\u003ctd\u003e27 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e6.8 oz (193 g)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Length\u003c\/td\u003e\n\u003ctd\u003e3.1\" (79 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 40mm Plössl Eyepiece\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Plossl-40mm-Eyepiece-1.jpg?v=1775526672\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e40mm Plössl Eyepiece\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue Dust Cap (top)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-2inch-Dustcap.jpg?v=1774403118\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Top)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cimg class=\"DAV-img-box\" alt=\"Tele Vue 1.25-inch Dust Cap (bottom)\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-1_25inch-Dustcap.jpg?v=1774403145\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003eDust Cap (Bottom)\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-40mm-Plossl-Eyepiece-Manual.pdf?v=1775699562\" 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\/televue-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eTeleVue 5-Year Limited Warranty for Telescopes and Accessories\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":51124531364125,"sku":"TV-EPL-40.0","price":246.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/TeleVue-Plossl-40mm-Eyepiece-1.jpg?v=1775526672","url":"https:\/\/davidastro.com\/products\/televue-plossl-40mm-43-eyepiece","provider":"David Astro","version":"1.0","type":"link"}