{"product_id":"ts-optics-hyperbolic-cassegrain-8","title":"TS-Optics Hyperbolic Classic Cassegrain - 8\"","description":"\u003cp\u003e\u003cstrong\u003eTS-Optics 8\" f\/12 Hyperbolic Cassegrain telescopes are excellent high contrast and optically sharp instruments, particularly well suited for lunar and planetary viewing and imaging. \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eIn terms of optical quality, Cassegrain telescopes are traditionally more advantageous than other \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003esimilar\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e designs such as \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eSCT's\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e which generally contain \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003emore basic\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e spherical mirrors and a larger central obstruction. Being an open ended system, similar to Newtonian designs, these cassegrains are also less susceptible to dew formation and also adapt to temperature changes much more quickly.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eAdvantages of the TS-Optics Cassegrain design:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWell corrected field due to parabolic primary and hyperbolic secondary mirror with less field curvature compared with other cassegrain designs.\u003c\/li\u003e\n\u003cli\u003eThese are a pure reflection system without a Schmidt plate, resulting in better sharpness as well as the possibility for IR Photography\u003c\/li\u003e\n\u003cli\u003eSignificantly quicker temperature adaption thanks to Newtonian style open ended design.\u003c\/li\u003e\n\u003cli\u003eBrighter image due to 96% dielectric coating on primary and secondary mirror.\u003c\/li\u003e\n\u003cli\u003eNo mirror shifting while focusing, because the primary mirror is fixed.\u003c\/li\u003e\n\u003cli\u003eIncludes a high-quality 2\" Crayford focuser with micro-gear reduction and compression rings for 2\" and 1.25\" accessories\u003c\/li\u003e\n\u003cli\u003eOnly 33% obstruction caused by secondary mirror.\u003c\/li\u003e\n\u003cli\u003eBetter sharpness on the optical axis due to precise mirror surfaces and the lack of a front plate\u003c\/li\u003e\n\u003cli\u003eSeveral interior baffles for even higher image contrast\u003c\/li\u003e\n\u003cli\u003eGenerous backfocus allowing the use of 2\" accessories.\u003c\/li\u003e\n\u003cli\u003eCompact tube with only 580mm length - so can be operated with smaller mounts\u003c\/li\u003e\n\u003cli\u003ePrimary and secondary mirrors are adjustable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cstrong\u003eSpecs:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003cul\u003e\n\u003cli\u003eOptics: Cassegrain optics with parabolic primary and hyperbolic secondary mirror\u003c\/li\u003e\n\u003cli\u003eAperture: 203 mm (8\")\u003c\/li\u003e\n\u003cli\u003eFocal length: 2436mm\u003c\/li\u003e\n\u003cli\u003eF-ratio: f\/12\u003c\/li\u003e\n\u003cli\u003eColimation aid: Central marks on the secondary mirror for easier collimation\u003c\/li\u003e\n\u003cli\u003eSuitable for Infrared photography: yes\u003c\/li\u003e\n\u003cli\u003eBackfocus: Roughly 150mm from the 2\" receptacle\u003c\/li\u003e\n\u003cli\u003eOTA diameter: 230 mm\u003c\/li\u003e\n\u003cli\u003eOTA length: Approx 620mm\u003c\/li\u003e\n\u003cli\u003eWeight: 8.2 kg\u003c\/li\u003e\n\u003cli\u003eSecondary mirror obstruction: 33% (linear)\u003c\/li\u003e\n\u003cli\u003eFocuser: 2\" Crayford focuser with micro-gear reduction\u003c\/li\u003e\n\u003cli\u003eConnection thread of the focuser: M90x1 on the tube\u003c\/li\u003e\n\u003cli\u003eDual Dovetail: Vixen\/EQ5 + Losmandy style\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cem\u003eWhats included:\u003c\/em\u003e\u003cbr data-mce-fragment=\"1\"\u003e\n\u003col\u003e\n\u003cli\u003e8\" f\/12 Cassegrain OTA\u003c\/li\u003e\n\u003cli\u003e2\" focuser with reduction to 1.25\"\u003c\/li\u003e\n\u003cli\u003eDual Dovetails\u003c\/li\u003e\n\u003cli\u003eDust protection cap for the focuser and front aperture\u003c\/li\u003e\n\u003cli\u003eFinder shoe (mounted)\u003c\/li\u003e\n\u003cli\u003eM90 extension tubes\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"TS Optics","offers":[{"title":"Default Title","offer_id":42653300588787,"sku":"TSCAS8M","price":1191.18,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/products\/TSOptics8CassegrainTelescope_8.jpg?v=1649710741","url":"https:\/\/www.horizonastronomy.ie\/en-dk\/products\/ts-optics-hyperbolic-cassegrain-8","provider":"Horizon Astronomy • Telescope Center","version":"1.0","type":"link"}