{"product_id":"ts-hyperbolic-rc-8","title":"TS Hyperbolic Ritchey-Chrétien - 8\"","description":"\u003cp\u003e\u003cstrong\u003eTS GSO 8\" f\/8 RC Ritchey-Chrétien Telescope with Carbon Tube.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMost large professional telescope are designed and constructed to the Ritchey-Chrétien principle. Until recently, these telescopes were unaffordable for amateurs. Due to their unique design, Ritchey-Chrétien telescopes are primarily aimed to amateur astronomers with an interest in high resolution Astrophotography however an RC can also still be used for visual observing with an eyepiece if needed.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe advantages of the TS RC Telescopes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHyperbolic primary and secondary mirror for a large fully illuminated field of view.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAstrophotography with camera sensors up to 30mm diameter is possible without corrector. For larger sensors, like full-frame size, a specialised corrector is available.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e94% enhanced reflectivity on the main and secondary mirror for an even brighter image.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSignificantly shorter cooling down time due to open construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInternal baffles in the tube for even more contrast.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh back focus for correctors, reducers and also binoviewers.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDue to a redesign of the baffle tube, problems with stray light no longer occurs. Nevertheless, the illumination is still very good. Sensors up to full frame format can be used.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAstrophotography with the TS  8\" RC telescope:\u003cbr\u003e\u003c\/strong\u003eBetter and sharper astrophotos without a corrector and with shorter exposure times is exactly what this Ritchey-Chrétien telescope allows you to do with astro cameras and SLRs up to APS-C sensors. As a pure mirror system, you can even use the infrared light. You can achieve up to 25% shorter exposure times and sharper imaging than, for example, through a comparable Schmidt-Cassegrain telescope. For the use of a reflex camera without focal length reduction you need the 50mm and the 25mm extension between focuser and telescope.\u003c\/p\u003e\n\u003cp\u003eThe generous backfocus also allows the connection of correctors (which we recommend for the use of full-frame sensors). You can also connect a focal length reducer, thus further increasing the light intensity of the Ritchey-Chrétien.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAccessories - 0.67x CCD reducer for Astrophotography:\u003cbr\u003e\u003c\/strong\u003eThe \u003ca href=\"https:\/\/www.horizonastronomy.ie\/en-de\/products\/ts-optics-x0-67-ccd47-reducer?_pos=1\u0026amp;_sid=5e6823e7c\u0026amp;_ss=r\" target=\"_blank\" rel=\"noopener\"\u003eCCD47 reducer\u003c\/a\u003e improves the focal ratio from f\/8 to f\/5.36, thus reducing the exposure time to less than 50%. With this, you can capture dim nebulae and galaxies with more moderate exposure times.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe advantages of a carbon tube over a metal tube:\u003cbr\u003e\u003c\/strong\u003eThe weight reduction is minimal - only about 300 grams - the main advantage is the focus stability when temperature changes which is important for Astrophotography. When temperatures drop, metal contracts and the focus moves meaning refocusing is necessary. A carbon tube does not change, the combination of quartz glass mirror and carbon composite tube makes a readjustment of the sharpness obsolete, even for long time exposures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe 2\" Monorail focuser:\u003cbr\u003e\u003c\/strong\u003eThe Monorail focuser combines the ease of movement of a Crayford focuser with the stiffness of a rack-and-pinion focuser.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eFocuser Features:\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e A stainless steel bar instead of small ball bearings for more stiffness.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e No tilting anymore when locking the drawtube.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e 360° rotation for optimal object alignment\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e Female M69 x 1 thread for threaded adaptions\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e 2\" and 1.25\" compression rings for push adaptions\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e 1:10 dual speed for accurate focusing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e Motor focus can easily retrofitted\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e Lined scale for quick retrieving of the focus.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e Easy operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTelescope Spec:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOptical Design: True Ritchey-Chrétien design with a hyperbolic primary and secondary mirror\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAperture: 203mm \/ 8\"\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFocal length: 1624mm (1088mm using the \u003ca href=\"https:\/\/www.horizonastronomy.ie\/en-de\/products\/ts-optics-x0-67-ccd47-reducer?_pos=1\u0026amp;_sid=5e6823e7c\u0026amp;_ss=r\" target=\"_blank\" rel=\"noopener\"\u003eCCD47 Reducer\u003c\/a\u003e)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFocal ratio: f\/8 (f\/5.36 with the \u003ca href=\"https:\/\/www.horizonastronomy.ie\/en-de\/products\/ts-optics-x0-67-ccd47-reducer?_pos=1\u0026amp;_sid=5e6823e7c\u0026amp;_ss=r\" target=\"_blank\" rel=\"noopener\"\u003eCCD47 Reducer\u003c\/a\u003e)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eResolution: 0.58\"\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eReflectivity: 94% enhanced reflectivity\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eBack focus: 254mm from the tube´s backside or 159mm from the 2\" receptacle of the focuser\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube Diameter: 230mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube Length: 580mm with focuser\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: 7.6kg with focuser and dovetails\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTube Material: Carbon composite with internal baffles\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTotal Obstruction by Secondary: 85mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFocuser: 2\" dual speed Monorail\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eConnection Thread: M90 x 1\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDovetail Bars: 1x GP, 1x Losmandy style, each 395mm long\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eWhats included:\u003c\/em\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e 8\" f\/8 RC Astrograph\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e 2\" dual speed Monorail focuser \u003c\/li\u003e\n\u003cli\u003e2 x Dovetail\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e M90 extension tubes for easy reaching of the focus\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCollimation manual\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c!----\u003e","brand":"TS Optics","offers":[{"title":"Default Title","offer_id":49341713219919,"sku":"TSRC8C","price":1301.68,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/files\/TS-RC8-Telescope_6_a038c1cb-e09b-4965-9923-d5d36ac14c58.jpg?v=1721487726","url":"https:\/\/www.horizonastronomy.ie\/en-mc\/products\/ts-hyperbolic-rc-8","provider":"Horizon Astronomy • Telescope Center","version":"1.0","type":"link"}