{"product_id":"celestron-rasa-11-rowe-ackermann-schmidt-astrograph-v2-ota","title":"Celestron RASA 11\" Rowe-Ackermann Schmidt Astrograph V2 OTA","description":"\u003ch2\u003eCelestron 11\" Rowe–Ackermann Schmidt Astrograph (RASA 11) V2 Optical Tube Assembly – CGE Dovetail\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eUltra-fast f\/2.2 wide-field imaging for serious astrophotographers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCapture stunning deep-sky images in dramatically shorter exposure times with the RASA 11 V2 — a professional-grade, ultra-fast astrograph engineered specifically for modern astrophotography. Built by Celestron, the 11\" Rowe–Ackermann Schmidt Astrograph combines a powerful 279mm aperture with a blazing \u003cstrong\u003ef\/2.2 optical system\u003c\/strong\u003e, delivering pinpoint stars across massive sensors and wide fields of view that traditional telescopes simply can’t match.\u003c\/p\u003e\n\u003cp\u003eDesigned purely for imaging, the RASA 11 V2 is the perfect platform for DSLR and astronomical CCD cameras, offering exceptional resolution, minimal aberrations, and reduced tracking demands.\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This is a dedicated imaging telescope. It does \u003cstrong\u003enot\u003c\/strong\u003e support visual observing with eyepieces.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr\u003e\n\u003ch2\u003eUltra-Fast f\/2.2 Performance = Shorter Exposures, Easier Tracking\u003c\/h2\u003e\n\u003cp\u003eWith its \u003cstrong\u003e620mm focal length and f\/2.2 focal ratio\u003c\/strong\u003e, the RASA 11 V2 gathers light incredibly efficiently, allowing you to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eCapture faint deep-sky objects in much shorter sub-exposures\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReduce strain on your equatorial mount\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOften image \u003cstrong\u003ewithout autoguiding\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProduce wide-field mosaics with ease\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePerform sky surveys or even comet hunting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCompared to traditional f\/10 systems, you’ll achieve equivalent signal in a fraction of the time — without sacrificing resolution.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eHuge Image Circle for Today’s Largest Sensors\u003c\/h2\u003e\n\u003cp\u003eThe RASA 11 V2 is optimised for modern large-format cameras, featuring:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e43.3mm fully corrected image circle\u003c\/strong\u003e for pinpoint stars to the corners\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eUsable field up to 52mm\u003c\/strong\u003e, still delivering excellent performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIdeal for full-frame DSLRs and large astronomical CCD sensors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThis makes it a standout choice for astrophotographers working with high-resolution, wide-area imaging setups.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eAdvanced Optical Design with Rare-Earth Glass\u003c\/h2\u003e\n\u003cp\u003eThe RASA 11 V2 uses a sophisticated 4-element rare-earth optical system to suppress:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eComa\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eField curvature\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eChromatic aberration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCombined with Celestron’s \u003cstrong\u003eStarBright XLT coatings\u003c\/strong\u003e, this delivers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOutstanding edge-to-edge sharpness\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMinimal vignetting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHigh contrast and light throughput\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSpot sizes remain under \u003cstrong\u003e4.4 μm RMS\u003c\/strong\u003e across the field — exceptional performance for an astrograph in this class.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eUltra-Stable Focus System (USFS)\u003c\/h2\u003e\n\u003cp\u003eCritical focus at f\/2.2 demands absolute mechanical stability — which is why Celestron introduced the \u003cstrong\u003eUltra-Stable Focus System\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eAt its core is a precision linear ball bearing that:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eMinimises focus shift\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReduces mirror flop when slewing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eImproves repeatability during long imaging sessions\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe system is also compatible with the optional Celestron Focus Motor, making automated focusing straightforward.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eIntegrated Cooling \u0026amp; Imaging-Ready Design\u003c\/h2\u003e\n\u003cp\u003eEvery element of the RASA 11 V2 is engineered for astrophotography:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIntegrated 12V MagLev cooling fan\u003c\/strong\u003e for faster thermal stabilisation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDust-filtered ventilation ports\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFully multicoated optical window\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIncluded \u003cstrong\u003eT-thread and M48 camera adapters\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDual CGE dovetail bars for mounting accessories such as guide scopes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFrom optical spacing to airflow, this is a complete imaging system — not just a telescope.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e279mm (11\") Rowe–Ackermann Schmidt Astrograph\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUltra-fast \u003cstrong\u003ef\/2.2\u003c\/strong\u003e optical system\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e43.3mm corrected image circle (usable to 52mm)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eRare-earth glass optics for coma-free, flat-field imaging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUltra-Stable Focus System to minimise image shift\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIntegrated MagLev cooling fan\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStarBright XLT coatings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCGE dovetail mounting bars (top \u0026amp; bottom)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOptimised for DSLR and astronomical CCD cameras\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eOptical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOptical Design: Rowe–Ackermann Schmidt Astrograph\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAperture: 279mm (11\")\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFocal Length: 620mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFocal Ratio: f\/2.2\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eImage Circle: 43.3mm (optimised)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUsable Field: 52mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eResolution (Dawes): 0.41 arc sec\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLight Gathering Power: 1588× human eye\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWavelength Range: 400–700nm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOptical Coatings: StarBright XLT\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003ePhysical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eOptical Tube Length: 838.2mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOptical Tube Diameter: 330.2mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eWeight: 43 lb (19.5kg)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eConstruction: Aluminium\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFocuser: Ultra-Stable Focus System\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDovetail: CGE\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eIncluded Items\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e42mm T-thread camera adapter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e48mm camera adapter\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDust cover\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFan battery pack\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCGE dovetail bars\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose the Celestron RASA 11 V2?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eExtremely fast f\/2.2 system for rapid deep-sky imaging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMassive corrected image circle for large sensors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProfessional optical quality with rare-earth glass\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eReduced tracking and guiding requirements\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eUltra-stable focusing for critical f\/2 performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIntegrated cooling and imaging-ready design\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003eIf you’re looking for a high-end, wide-field astrograph capable of producing professional results with modern large-format cameras — while dramatically cutting exposure times — the \u003cstrong\u003eCelestron RASA 11 V2\u003c\/strong\u003e stands as one of the most powerful imaging platforms available in its class.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSolar safety reminder: Never observe the Sun without a certified solar filter.\u003c\/em\u003e\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":55897332744566,"sku":"050234910767","price":5054.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0909\/2235\/3014\/files\/Celestron-RASA-11-Rowe-Ackermann-Schmidt-Astrograph-V2-OTA-91076-1.webp?v=1770300630","url":"https:\/\/welshastronomy.co.uk\/products\/celestron-rasa-11-rowe-ackermann-schmidt-astrograph-v2-ota","provider":"The Welsh Astronomy Centre","version":"1.0","type":"link"}