{"product_id":"celestron-6-rasa-optical-tube-assembly","title":"Celestron 6\" RASA Optical Tube Assembly","description":"\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eLightning-Fast Imaging:\u003c\/b\u003e RASA’s legendary ultra-fast f\/2.2 optics let you capture deep-sky images with briefer sub-exposures and less total exposure time —often eliminating the need for autoguiding.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMobile But Mighty:\u003c\/b\u003e Weighing just 8.4 lb and featuring a versatile CG-5 dovetail, the RASA 6 is ready to image wherever you are.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSub-Arcsecond Potential:\u003c\/b\u003e With advanced optics capable of sub-arcsecond resolution, RASA 6 perfectly pairs with a high-resolution camera and favorable sky conditions to reveal fine structures in galaxies and nebulae.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eExpansive Field of View:\u003c\/b\u003e Designed for sensors up to 22mm diagonal, RASA 6 offers a generous 3.8° view that effortlessly frames wide celestial targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMaximized Light Throughput:\u003c\/b\u003e Celestron’s proprietary XLT coatings ensure every image bursts with brightness and contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eConvenience \u0026amp; Customization:\u003c\/b\u003e With built-in features like a filter drawer and cooling fan—and optional upgrades—RASA 6 adapts to your evolving astroimaging needs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable class=\"table-open\" id=\"product-specs-list\" role=\"table\" aria-label=\"Product Specifications\"\u003e\n\u003ctbody role=\"rowgroup\"\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOptical Design:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eRowe-Ackermann Schmidt Astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eAperture:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e152mm (5.98\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eFocal Length:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e335mm (13.18\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eFocal Ratio:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003ef\/2.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eCentral obstruction diameter:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e77mm (3.03\") (50.7% of aperture diameter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eLight Gathering Power (Compared to human eye):\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e472x\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eResolution (Rayleigh):\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e0.91 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eResolution (Dawes):\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e0.76 arc seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eImage Circle:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e16mm (0.63\") Ø, 2.74°\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eUseable field:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e22mm (0.86\") Ø, 3.76°, only minimal performance loss at edge of FOV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eWavelength range:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e400 - 700 nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eSpot size:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e\u0026lt; 1.5 μm RMS across image circle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOptical Coatings:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eStarBright XLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOff-axis Illumination:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e91% at 8mm (0.31\") off-axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eBack focus with included camera adapter:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e17.5mm (0.69\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOptical Tube:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eAluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOptical Tube Length:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e500.5mm (19.7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOptical Tube Diameter:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e177.8mm (7\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eFocuser:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eStandard Schmidt-Cassegrain focuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eFinderscope:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOptical Tube Weight:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e8.4 lbs (3.8 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eOther Features:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eAir-cooling system, integrated filter mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eIncluded items:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e42mm (1.65\") T-thread camera adapter \u003cbr aria-hidden=\"true\"\u003eFan battery pack \u003cbr aria-hidden=\"true\"\u003eFilter drawer with 2\" clear filter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eDovetail:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eCG-5 Dovetail Bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eFilter Drawer:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eAccept 2\" format filters, includes 1.25\" filter adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eClear Filter:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e2\" filter, removable, AR coatings, 2mm glass thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eCooling Fan:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003e12V DC, MagLev\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr role=\"row\"\u003e\n\u003cth role=\"rowheader\" scope=\"row\"\u003eCamera Mounting Threads:\u003c\/th\u003e\n\u003ctd role=\"cell\"\u003eM42\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eMeet the Rowe-Ackermann Schmidt Astrograph (RASA) 6—a compact powerhouse that delivers spectacular astroimages, anywhere. Engineered with ultra-fast f\/2.2 optics, the smallest member of the RASA family proves that you don’t have to sacrifice performance for portability. Whether you’re chasing dark skies in remote locations or elevating your backyard setup, RASA 6 opens the door to new possibilities.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRASA Performance for Everyone\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFor astrophotographers who demand speed, precision, and convenience in a compact package, the 6” RASA is the ultimate tool. Its f\/2.2 design dramatically shortens exposure times, making it easier to capture crisp, detailed images of faint deep-sky objects without the heavy burden of extended tracking.\u003c\/p\u003e\n\u003cp\u003eSince RASA technology debuted in 2014, it has become the trusted choice for space surveillance and satellite tracking, relied upon by defense contractors, professional researchers, and governments alike. Like its bigger brothers, RASA 6 features a flat field for sharp stars from edge to edge. With RASA 6, you get the same technology trusted by the pros, \u003cspan data-teams=\"true\"\u003ebut at a price that’s within reach for most, including those looking to add a second grab-and-go astrograph to their arsenal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eRASA 6 defies the limitations of smaller and slower instruments. It collects more light and provides higher resolution than the refractors in its price range, allowing you to capture faint details in galaxies, nebulae, and star clusters in less time.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eShorter Exposures for a “Near-Real Time” Experience\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe magic of RASA 6 is in its speed. Its blazing f\/2.2 optics mean that even faint objects can be imaged in short exposures. When paired with sensitive cameras and live-stacking software on your laptop, you can create an almost real-time imaging experience. Bright, detailed images appear on your laptop screen in just a few short exposures.\u003c\/p\u003e\n\u003cp\u003eThe system’s ultra-fast focal ratio also eases the tracking demands on your mount. Since it allows using much shorter sub-exposures, you won’t need to use an autoguider in many instances, so you’ll spend less time dealing with equipment and more time exploring the universe.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eRASA Optical Design: Engineering Excellence\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe patented Rowe-Ackermann Schmidt optical design sets RASA 6 apart from other systems. This design features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eA Schmidt corrector and a high-precision primary mirror that work in tandem to minimize optical aberrations.\u003c\/li\u003e\n\u003cli\u003eA specialized three-element lens group using rare-earth glass, which ensures that more of the light emitted from celestial objects is sharply focused onto your sensor.\u003c\/li\u003e\n\u003cli\u003eA removable 2” clear filter – engineered to maintain peak F\/2.2 performance when you add a filter, as no extra glass is added into the light path.\u003c\/li\u003e\n\u003cli\u003eStarBright XLT coating system for all refractive and reflective surfaces, guaranteeing maximum light transmission and superior field illumination.\u003c\/li\u003e\n\u003cli\u003eThe RASA optical design provides better overall performance and field illumination than a Schmidt-Cassegrain in the Fastar-style configuration.\u003c\/li\u003e\n\u003cli\u003eCan be used with sensors up to 22mm diagonal to provide a wide 3.8° while delivering sub-arcsecond resolution.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eAdvanced Features \u0026amp; Versatility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eDesigned with the modern astroimager in mind, RASA 6 is loaded with features that enhance usability and adaptability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBuilt-in Filter System\u003c\/strong\u003e\u003cbr aria-hidden=\"true\"\u003eThe integrated filter drawer accepts both 1.25” and 2” filters, giving you the flexibility to use various imaging filters. The removable 2” clear filter (i.e. optical window) allows you to add optional filters if desired, without introducing additional glass into the optical path that could compromise performance at f\/2.2.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIntegrated Cooling System\u003c\/strong\u003e\u003cbr aria-hidden=\"true\"\u003eA 12V MagLev fan pulls air through mesh vents to rapidly cool the system to the ambient temperature to provide best images while keeping internal components dust-free.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eM42 Camera adapter\u003c\/strong\u003e\u003cbr aria-hidden=\"true\"\u003eThe included camera adapter for the RASA 6 features standard M42 threads, making it easy to mount a wide variety of astronomical CMOS cameras.\u003c\/p\u003e\n\u003ch2\u003e\n\u003cbr aria-hidden=\"true\"\u003e\u003cstrong\u003eA Universe of Possibilities in a Compact Package\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eThe 6” RASA offers the perfect blend of speed, precision, and portability. Its game-changing optical design and robust mechanical features empower you to capture the night sky like never before. Embrace a grab-and-go astrograph that opens up a big, boundless universe.\u003c\/p\u003e","brand":"Celestron","offers":[{"title":"Default Title","offer_id":51031867490561,"sku":"91071","price":1699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0327\/2569\/6648\/files\/RASA6_A.webp?v=1793749279","url":"https:\/\/starizona.com\/products\/celestron-6-rasa-optical-tube-assembly","provider":"Starizona","version":"1.0","type":"link"}