{"product_id":"celestron-14-edgehd-optical-tube","title":"Celestron - 14\" EdgeHD (Optical Tube)","description":"\u003cp\u003eThe EdgeHD optics (Edge High Definition) combine the compact design of a Schmidt-Cassegrain with a significantly improved flat field at the edge of the mirror for imaging. This optical system not only offers the properties of astrographs, but also produces completely undistorted, sharp images right up to the edge of the large visual and photographic field of view. Not only is the coma outside of the optical axis corrected - but also the field curvature!\u003c\/p\u003e\n\u003cp\u003eMany optical systems are promoted as \"astrographs\", however, they produce the coveted \"pinpoint\" star image along a curved image plane. On images taken with modern CCD cameras, the result is a noticeable field curvature that increases towards the edge of the image field and becomes stronger the larger the chip is; i.e. the stars remain round, but are blown up into small rings (\"donuts\") towards the edge.\u003c\/p\u003e\n\u003cp\u003eWith the Celestron Edge HD telescopes, this field curvature is corrected right up to the edge in addition to the coma, so that even images taken with large CCD chips are able to remain completely sharp right into the corners of the image field.\u003c\/p\u003e\n\u003cp\u003eThis also significantly improves resolution and limiting magnitude compared to competing optical systems with a similar aperture. The Celestron XLT multi-coating also helps the Edge HD optics to achieve a significant increase in performance compared to similar systems on the market.\u003c\/p\u003e\n\u003cp\u003eThe EdgeHD optics produces a three-times flatter image in the field plane than a standard Schmidt-Cassegrain. The stars are imaged diffraction-limited across the entire chip of a Nikon D3 or Canon 5D for example.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eIn addition to the new optics, the mechanics and tube have also been completely redesigned. The new features include:\u003c\/em\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eMirror locks to hold the main mirror in any focus position without exerting pressure on the optical elements. The image always remains stable on the chip, even with long exposure times.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eVentilation openings behind the main mirror ensure rapid air exchange, so that the optics cool down at a much faster rate. Thanks to an air filter system, no dust gets into the tube either.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHyperStar Compatible - All EdgeHD tubes allow you to remove the secondary mirror and replace it with the optional HyperStar optics. The result: your standard Celestron EdgeHD telescope becomes a digital Schmidt Design for your CCD or DSLR camera for prime-focus photography at f\/2 (C8, C11) and f\/1.9 (C14).\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAdapted telecompressors (f\/7.5) and Barlow lenses (f\/20) are under development.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAxiom eyepieces - The HD 14 comes with an Axiom eyepiece from Celestron. With a 23mm focal length and 82° field of view, which gives you an impressive combination of magnification and field of view.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eSpec:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOptical design: EdgeHD\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptical coating: Starbright XLT (Fully Multi-Coated)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTelescope aperture: 355.6mm (14\")\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eResolution (DAWES): 0.33 arc seconds\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eresolution (RAYLEIGH): 0.39 arc seconds\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFocal length: 3910mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eF Ratio: f\/11\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSecondary mirror obstruction: 11.4cm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSecondary mirror obstruction relative to diameter: 32.00%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSecondary mirror obstruction relative to the surface: 10.00%\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLimiting size: 15.3 mag\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHighest useful magnification: x840\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLight-gathering capacity (compared to the human eye): x2581\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFocuser size: 3.3\" + 2\" SC thread, 1.25\"\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube (material): Aluminum\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube weight: 21kg\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube length: 31in (787mm)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDovetail: CGE (3\" Losmandy-Style)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eWhats included:\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli style=\"font-style: italic;\"\u003e\n\u003cem\u003eFocal length eyepiece: 23mm\u003c\/em\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-style: italic;\"\u003e\n\u003cem\u003eIncluding accessories: 14\" EdgeHD telescope with 3\" rail (Losmandy style), 9x50 finder, 2\" star diagonal, 1.25\" adapter\u003c\/em\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-style: italic;\"\u003e\n\u003cem\u003eViewfinder: 9x50\u003c\/em\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli style=\"font-style: italic;\"\u003e\u003cem\u003eZenith prism: 2\" with 1.25\" adapter\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":49856204734799,"sku":"822220X","price":7806.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/files\/Celestron-EdgeHD-14_9.webp?v=1728637030","url":"https:\/\/www.horizonastronomy.ie\/en-gb\/products\/celestron-14-edgehd-optical-tube","provider":"Horizon Astronomy • Telescope Center","version":"1.0","type":"link"}