{"product_id":"celestron-36-cm-14-rowe-ackermann-schmidt-astrograph-ota-91078","title":"Celestron 36 cm (14\") Rowe-Ackermann Schmidt Astrograph OTA - V2 - 91078","description":"\u003ch3 style=\"text-align: center;\"\u003eCelestron 36 cm (14\") Rowe-Ackermann Schmidt Astrograph Optical Tube Assembly - V2\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThis is a breakthrough 36 cm (14 inch) aperture, f\/2.2 optical system designed for professional applications that require both a wide field of view and high resolution\u003c\/li\u003e\n\u003cli\u003eIdeal for use in space surveillance and other scientific applications\u003c\/li\u003e\n\u003cli\u003eA 4-element lens group utilizes extra-low dispersion (ED) glass for images free of false color, coma, and field curvature\u003c\/li\u003e\n\u003cli\u003eCelestron's Rowe-Ackermann Schmidt Astrograph (RASA) 36 cm is also an excellent choice for advanced astroimaging\u003c\/li\u003e\n\u003cli\u003eA 60 mm optimized image circle maintains pinpoint stars to the far corners of the largest available sensors\u003c\/li\u003e\n\u003cli\u003eExtended spectral range takes advantage of sensor response in the 700-900 nm range, allowing brighter overall images\u003c\/li\u003e\n\u003cli\u003eIncludes the Ultra-Stable Focus System (USFS) with a linear ball bearing to minimize focus shift and mirror flop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 36 cm (14\") Rowe-Ackermann Schmidt Astrograph (RASA) from Celestron, is a cost-effective optical system for space surveillance, Space Situational Awareness (SSA), other scientific applications, and advanced wide field astroimaging. It offers unprecedented value in aperture, speed, field of view, and optical performance. The RASA design has a convenient external prime-focus image capture location with a flat focal plane, providing small spot sizes to the edge of a wide field. The result is images that are free of optical defects like field curvature, off-axis coma, or astigmatism. RASA 36 centimeter has an ample back-focus distance of 77.5 mm which accommodates a wide variety of imaging sensors. A custom camera adapter can be added for a field of view up to 4.4 degrees.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003eSome Information About the RASA Technology:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCelestron’s proprietary XLT coatings, which are high-transmission multi-coatings for lenses and high reflectivity aluminum coatings, ensure good light throughput for the optical system.\u003c\/li\u003e\n\u003cli\u003eAn integrated cooling fan helps optics cool down to ambient temperature and pulls air through vents with micromesh to prevent dust ingress.\u003c\/li\u003e\n\u003cli\u003eDual dovetail bars offer flexibility to mount the optical tube and conveniently attach additional accessories via “CGE\/Losmandy” style dovetails.\u003c\/li\u003e\n\u003cli\u003eTwo sets of 2x threaded insert holes in the rear cell provide additional mounting options.\u003c\/li\u003e\n\u003cli\u003eMove and mount your optical tube with ease using the carrying handles on the rear cell.\u003c\/li\u003e\n\u003cli\u003eAlthough not normally needed, there are 3x sets of push-pull screws to adjust the lens group to achieve ideal optical alignment for the entire system.\u003c\/li\u003e\n\u003cli\u003eIncludes an M48 camera adapter.\u003c\/li\u003e\n\u003cli\u003eA Motor System specifically designed for the RASA 36 cm focuser is manufactured by Starlight Instruments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 36 cm (14\") Schmidt Astrograph is the largest RASA Celestron manufactures. This OTA is the largest aperture and fastest (f\/2.2) optical instrument of its kind available “off-the-shelf.” Unlike most telescopes, which only focus visible light (400 nm-700 nm), the RASA 36 cm focuses an extended spectral range (400 nm-900 nm), allowing a brighter signal to be detected by a camera sensor which typically have higher responsivity in the red and near-IR regions. The RASA 36 cm also features a redesigned focus system. The USFS, or Ultra-Stable Focus System, utilizes a linear ball bearing to even further minimize focus shift (unwanted lateral motion of the primary mirror during focusing) and mirror flop (movement of the primary mirror when the telescope is pointing to different positions in the sky), further improving the performance of this professional class telescope.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNOTE:\u003c\/strong\u003e One image shows a digital camera installed on the product for illustration purposes, only. This product does NOT include a camera!\u003c\/p\u003e\n\u003ch3 style=\"text-align: center;\"\u003eSpecifications:\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Design\u003c\/td\u003e\n\u003ctd\u003eRowe-Ackermann Schmidt Astrograph (RASA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e355.6 mm (14\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Length\u003c\/td\u003e\n\u003ctd\u003e790 mm (31.1\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal Ratio\u003c\/td\u003e\n\u003ctd\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCentral obstruction diameter\u003c\/td\u003e\n\u003ctd\u003e158 mm (6.22\") (44% of aperture diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLight Gathering Power (Compared to human eye)\u003c\/td\u003e\n\u003ctd\u003e2581X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Rayleigh)\u003c\/td\u003e\n\u003ctd\u003e0.39 arcsecond\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution (Dawes)\u003c\/td\u003e\n\u003ctd\u003e0.36 arcsecond\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImage circle\u003c\/td\u003e\n\u003ctd\u003e60.1 mm (2.36\") Ø, 4.4°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUseable field\u003c\/td\u003e\n\u003ctd\u003e70 mm (2.75\") Ø, 5.1°, only minimal performance loss at edge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelength range\u003c\/td\u003e\n\u003ctd\u003e400 nm – 900 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpot size\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 6.3 μm RMS across FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical coatings\u003c\/td\u003e\n\u003ctd\u003eEnhanced aluminum, XLT multi-coatings used throughout\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOff-axis Illumination\u003c\/td\u003e\n\u003ctd\u003e83% at 30 mm (1.18\") off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical window\u003c\/td\u003e\n\u003ctd\u003e104 mm (4.09\") Ø\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack focus with included camera adapter\u003c\/td\u003e\n\u003ctd\u003e55 mm (2.16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBack focus from top of threaded collar\u003c\/td\u003e\n\u003ctd\u003e77.5 mm (3.05\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube\u003c\/td\u003e\n\u003ctd\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Length\u003c\/td\u003e\n\u003ctd\u003e1079.5 mm (42.5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Diameter\u003c\/td\u003e\n\u003ctd\u003e106.4 mm (16\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocuser\u003c\/td\u003e\n\u003ctd\u003eNew focuser design, USFS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinderscope\u003c\/td\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Tube Weight\u003c\/td\u003e\n\u003ctd\u003e75 lb (34.02 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther features\u003c\/td\u003e\n\u003ctd\u003eVentilation fan, dual dovetail mounting bars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded items\u003c\/td\u003e\n\u003ctd\u003e48 mm (1.89\") camera adapter, fan battery pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":19431359545457,"sku":"CEL-91078","price":13458.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/products\/RASA_36_1_570x380_2x_8c3a96b0-09e5-4b4b-ab6d-ddbfbf730d78.jpg?v=1776459146","url":"https:\/\/khanscope.com\/en-fr\/products\/celestron-36-cm-14-rowe-ackermann-schmidt-astrograph-ota-91078","provider":"Khan Scope Centre","version":"1.0","type":"link"}