{"product_id":"ts-optics-hyperbolic-cassegrain-6","title":"TS-Optics Hyperbolic Classic Cassegrain - 6\"","description":"\u003cp\u003e\u003cstrong\u003eTS-Optics 6\" 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\u003eIn terms of optical quality, Cassegrain telescopes are traditionally more advantageous than other similar designs such as SCT's which generally contain more basic 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.\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 38% 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 500mm 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: 154mm (6\")\u003c\/li\u003e\n\u003cli\u003eFocal length: 1848mm\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: 191mm\u003c\/li\u003e\n\u003cli\u003eOTA length: Approx 500mm\u003c\/li\u003e\n\u003cli\u003eWeight: 5.4 kg\u003c\/li\u003e\n\u003cli\u003eSecondary mirror obstruction: 38% (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\u003eDovetail: Vixen\/EQ5\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\u003e6\" f\/12 Cassegrain OTA\u003c\/li\u003e\n\u003cli\u003e2\" focuser with reduction to 1.25\"\u003c\/li\u003e\n\u003cli\u003eDovetail: Vixen\/EQ5\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":42653350920435,"sku":"TSCAS6M","price":618.7,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/products\/TSOptics6CassegrainTelescope_6.jpg?v=1649710262","url":"https:\/\/www.horizonastronomy.ie\/en-se\/products\/ts-optics-hyperbolic-cassegrain-6","provider":"Horizon Astronomy • Telescope Center","version":"1.0","type":"link"}