{"product_id":"svbony-40mm-plossl-eyepiece-with-filter-threads-125in","title":"SVBONY 40mm Plössl Eyepiece with Filter Threads - 1.25\"","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e40mm Focal Length\u003c\/li\u003e\n\u003cli\u003e40° Apparent Field of View\u003c\/li\u003e\n\u003cli\u003e1.25\" Barrel Diameter\u003c\/li\u003e\n\u003cli\u003eStandard M28.5*0.6 Filter Threads\u003c\/li\u003e\n\u003cli\u003eLightweight 82g Metal Construction\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\u003eSVBONY 1.25inch Plossl Eyepiece 40mm with Filter Threads\u003c\/h2\u003e\n\u003cp\u003eThe SVBONY 1.25inch Plossl Eyepiece delivers the lowest practical magnification in the 1.25-inch format with its 40mm focal length. Its classic 4-element, 2-group Plössl design provides a 40-degree apparent field of view, ideal for maximizing image brightness in a lightweight 82g metal body.\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 40mm Plössl Advantage: Maximizing Brightness in a 1.25\" Barrel\u003c\/h3\u003e\n\u003cp\u003eWith a 40mm focal length, this eyepiece is engineered to produce the largest possible exit pupil in a 1.25\" barrel, making it an essential tool for \"finder\" applications in long focal-ratio telescopes like SCTs and Maksutovs. The resulting bright image is particularly beneficial when using narrow-band nebula filters, as it helps offset the dimming effect of the filter, making faint structures like the Veil Nebula (NGC 6960) easier to detect.\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\u003e4-Element Design with Fully Multi-Coated Optics\u003c\/h3\u003e\n\u003cp\u003eThe eyepiece uses a classic 4-element, 2-group Plössl optical design known for sharp, high-contrast views. All air-to-glass surfaces are fully multi-coated (FMC) to maximize light transmission and reduce reflections. Combined with blackened lens edges, this design suppresses internal stray light, delivering a clean, dark background sky that makes stars and faint deep-sky objects stand out.\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\u003eSVBONY 40mm vs. a 32mm Plössl: A 40° Field Trade-Off\u003c\/h3\u003e\n\u003cp\u003eWhile a standard 32mm Plössl offers a wider apparent field of view (typically around 52°), the SVBONY 40mm Plössl's key advantage is its lower magnification and brighter image. The trade-off is its narrower 40° apparent field. For observers with f\/10 or slower telescopes, the 40mm is often the better choice for locating objects and observing large, faint nebulae, while the 32mm provides a more immersive, wide-window feeling on brighter targets.\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\"\u003eWhy choose the SVBONY 40mm Plössl instead of a 32mm Plössl?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe SVBONY 40mm Plössl provides lower magnification and a larger exit pupil than a 32mm Plössl. This results in a brighter image, which is highly advantageous for locating faint objects, observing with nebula filters, and using long focal-ratio telescopes like Schmidt-Cassegrains. The primary trade-off is a narrower \u003cstrong\u003e40° apparent field of view\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eHow will the SVBONY 40mm Plössl perform on the Orion Nebula (M42) in an 8\" f\/10 SCT?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eIn an 8\" f\/10 SCT (2032mm focal length), the SVBONY 40mm Plössl will provide 51x magnification and a large 4mm exit pupil. This is an excellent combination for viewing the Orion Nebula (M42), revealing its full extent from the bright Trapezium core out to the fainter outer loops of nebulosity, all within a single bright field of view.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWill this 40mm eyepiece work with my 1.25\" nebula filters?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eYes. The SVBONY 40mm Plössl features standard \u003cstrong\u003eM28.5*0.6 filter threads\u003c\/strong\u003e on its 1.25\" barrel, making it compatible with all standard 1.25\" astronomy filters, including UHC, O-III, and H-beta filters for enhanced views of nebulae.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eIs the SVBONY 40mm Plössl good for planetary viewing?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eNo, this eyepiece is not designed for planetary viewing. Its \u003cstrong\u003e40mm focal length\u003c\/strong\u003e provides very low magnification, which is ideal for finding objects and viewing large deep-sky targets. For observing planets like Jupiter or Saturn, you would need a short focal length eyepiece (e.g., 6mm to 10mm) to achieve the high magnification required to see surface details.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat is the benefit of the SVBONY 40mm Plössl's 40° apparent field?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003eThe 40° apparent field is a direct result of maximizing the focal length within the constraints of a 1.25\" barrel. While narrower than other designs, it allows the eyepiece to deliver the lowest possible magnification and brightest image for this format, which is its primary purpose. It serves as an excellent \"finder\" eyepiece for scanning large areas of the sky.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion\"\u003e\n\u003ch3 class=\"DAV-accordion-Q\"\u003eWhat does \"blackened lens edges\" on the SVBONY 40mm Plössl do?\u003c\/h3\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-accordion-A\"\u003e\n\u003cp\u003e\u003cstrong\u003eBlackened lens edges\u003c\/strong\u003e absorb stray light that might otherwise reflect off the side of the lenses and enter the light path. This simple but effective feature improves image contrast by reducing internal glare, resulting in a darker background sky and making faint objects easier to see.\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\u003e40mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarrel Size\u003c\/td\u003e\n\u003ctd\u003e1.25 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApparent Field of View\u003c\/td\u003e\n\u003ctd\u003e40 Degrees\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Design\u003c\/td\u003e\n\u003ctd\u003ePlössl, 2 groups \/ 4 elements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLens Coating\u003c\/td\u003e\n\u003ctd\u003eFully Multi-Coated (FMC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Threads\u003c\/td\u003e\n\u003ctd\u003eM28.5*0.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlackened Lens Edges\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEyecup Type\u003c\/td\u003e\n\u003ctd\u003eRubber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eMetal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeight\u003c\/td\u003e\n\u003ctd\u003e79mm \/ 3.11in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e82 g \/ 2.9oz\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\"\u003e1.25inch Plossl Eyepiece 40mm\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\u003ca href=\"https:\/\/davidastro.com\/pages\/svbony-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eSVBONY 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SVBONY","offers":[{"title":"Default Title","offer_id":52861228777757,"sku":"SV-F9122A","price":24.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/SVBONY-1-25inch-Plossl-Eyepiece-40mm-with-Filter-Threads-1_794671a4-0f60-4fb7-ac78-9e331fd48d25.jpg?v=1788659618","url":"https:\/\/davidastro.com\/fr\/products\/svbony-40mm-plossl-eyepiece-with-filter-threads-125in","provider":"David Astro","version":"1.0","type":"link"}