{"product_id":"ritchey-chretien-pro-rc-250-2000-ota","title":"Ritchey-Chretien Pro RC 250\/2000 OTA","description":"\u003cdiv\u003e\n\u003cp\u003e\u003cb\u003eNext night, next level: Omegon RC telescope for astrophotographers\u003c\/b\u003e\u003cbr\u003eAre you looking for a good telescope for astrophotography? With Omegon Ritchey-Chrétien telescopes, your astrophotos will reach the next level of quality. Omegon RC telescopes offer a wide visual field free of coma aberration, so you can enjoy perfectly round stars even at the edge of the image. Discover why RC telescopes are the perfect solution for astrophotographers and the first choice for professionals.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSummary of advantages:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHyperbolic mirrors: extremely sharp images and large visual field without correctors\u003c\/li\u003e\n\u003cli\u003eQuartz mirrors: greater focus stability without the need for readjustment\u003c\/li\u003e\n\u003cli\u003eHigh reflection: dielectric coating with 92-94% reflection for clear, contrast-rich observations and astrophotos\u003c\/li\u003e\n\u003cli\u003eFast cooling thanks to the open design\u003c\/li\u003e\n\u003cli\u003eElectric fan for even more immediate cooling (10\" version only)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eHyperbolic mirror for better image quality\u003c\/b\u003e\u003cbr\u003eRC telescopes are equipped with hyperbolic primary and secondary mirrors. Not with spherical mirrors, like Schmidt-Cassegrain systems.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eThis great idea offers an advantage:\u003c\/b\u003e you will get better, sharper astrophotos in a wider useful visual field! Ultra-sharpness is guaranteed with APS-C sensors, even without a corrector. This technology was hardly affordable until a few years ago. But now Omegon's new RC telescopes are within reach of any astronomy enthusiast.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003ePhotos without corrector\u003c\/b\u003e\u003cbr\u003eUse your astronomical camera or DSLR directly with your telescope. You no longer need a corrector to get perfectly round star photos, free of coma aberration, even at the edge. The 6\" RCs are compatible with APS-C format sensors, such as those of Canon EOS or similar. In the 8 and 10\" models you can even use 24x36 mm FullFrame sensors without a corrector. In addition, you can also use professional DSLR cameras and countless astronomical cameras. And if you want to take photos in medium format, do not hesitate to ask us about the appropriate resolution.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eQuartz primary mirror\u003c\/b\u003e\u003cbr\u003eIf you have experience in astrophotography, you have probably experienced the focus shifting during long-exposure captures. It's very annoying! The advantage of this model is that it has 2 quartz mirrors. It hardly suffers thermal expansion, so it produces fantastic images and maintains focus all night long.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eLarge unobstructed aperture: 3\" focuser\u003c\/b\u003e\u003cbr\u003eThe rear end is extremely important. A 3\" linear Crayford focuser with ball bearings ensures enough space to illuminate even the widest visual fields without vignetting. This hybrid between Crayford and rail combines the simplicity of Crayford focusers and the stability of a good rack-and-pinion focuser.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAlways perfect alignment with your observation target: fully rotatable focuser\u003c\/li\u003e\n\u003cli\u003eAdapters to 2 and 1.25\" with integrated compression ring\u003c\/li\u003e\n\u003cli\u003ePrecision focusing: 1:10 reduction for minimal focus adjustment\u003c\/li\u003e\n\u003cli\u003eGraduated scale: to quickly regain focus\u003c\/li\u003e\n\u003cli\u003eGreat stability: camera support on the optical axis without tilting for a sharp image\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eBetter image quality than with SC telescopes\u003c\/b\u003e\u003cbr\u003eRC telescopes are, in essence, completely different from SC or Maksutovs. They are open systems without a corrector plate that adjust much faster to ambient temperature than SC telescopes. In addition, by not having a plate on the front, these telescopes capture clearer images without the risk of reflections. Ritchey-Chrétien systems are the most highly corrected double-mirror telescopes available. The sharpness of the field of view, including the edge, is impressive. So it's not surprising that virtually all large research telescopes in professional observatories use this type of optical tube.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAnd now within everyone's reach\u003c\/b\u003e\u003cbr\u003eThe manufacture of hyperbolic mirrors is a science and an art. Until a few years ago, RC telescopes were among the most expensive in the world and were only found in international research institutions. However, today this technology is also affordable for experienced amateur astronomers.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Omegon","offers":[{"title":"Default Title","offer_id":53581585285463,"sku":"53811","price":2140.5,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/6198\/6860\/files\/53811_1.jpg?v=1779016033","url":"https:\/\/astrotelescopios.com\/en-efta\/products\/ritchey-chretien-pro-rc-250-2000-ota","provider":"Astro Telescopios","version":"1.0","type":"link"}