Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph RASA Telescope, OTA Only For Sale
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph RASA Telescope, OTA Only:
$2079.00
Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph RASA Telescope, OTA OnlySKU: CNOTARASA8Mfr. Part: 91073
Item Includes8-inch optical tube assembly - 42 mm T-thread camera adapter - C-thread camera adapter - Fan Battery Pack - 2-Year Warranty
DescriptionCapture spectacular wide-field deep sky images in seconds with Celestron's new portable astrograph, the 8" Rowe-Ackermann Schmidt Astrograph (RASA). This incredibly fast f/2.0 system is the perfect companion to today's color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras. Thanks to its fast focal ratio and patented optical design, you can produce sharp, detailed images and, in many cases, skip the autoguider completely. Weighing in at just 17 pounds, it's easy to transport your 8" RASA to the most remote dark sky locations. RASA Performance Made for Everyone
The 8" RASA is an imaging telescope that delivers a flat field without optical aberrations for razor sharp stars across a wide field of view. It can capture stunning deep-sky astronomical images without the challenges typically presented by longer focal length instruments at a fraction of the cost of those systems. The latest addition to the RASA family, this 8" version is a much more portable and affordable version of the heralded RASA 11, which was introduced to much acclaim in 2014. With the 8" RASA joining the lineup, a wider range of astroimagers can enjoy the benefits of the RASA design. It has many of the same thoughtfully designed features as its "big brother" RASA 11, including the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar. Purely designed for imaging, the 8" RASA cannot be used visually. The prime focus focal plane is located at the front of the optical system, so it cannot accommodate a traditional eyepiece. Shorter Exposure Times and Virtual "Real-Time" Observing
Since it is an F/2.0 optical system, imagers can use shorter exposure times to capture detail in faint objects. When combined with sensitive cameras and the proper "live stacking" software, the 8" RASA can provide an almost real-time observing experience. View images on a computer instantly that are brighter and more detailed than can be seen in much bigger telescopes with the naked eye. Because shorter exposure times are possible, your equatorial mount won't need to accurately track over extended periods. The 8" RASA's relatively short 400mm focal length also lessens equatorial tracking demands. In many cases, autoguiding will not be required. Weighing only 17 lb, this optical tube pairs perfectly with a wide variety of mounts. Ultra-Stable Focus System
With the launch of the 8" RASA, Celestron is unveiling a new focuser design that mitigates lateral movement of the primary mirror when focusing, slewing, or tracking with the astrograph. Focusing is easier, more accurate, and more stable than ever. The key to the Ultra-Stable Focus System is two sets of precision bearings that are precisely aligned and tested during assembly to ensure optimal results. Built for Today's Latest Cameras
Unlike the larger RASAs that work with DSLR and large CCD cameras, the 8" model was designed with color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras. It is optimized for sensors with up to a 22mm diagonal, but performs well with sensors up to 32mm diagonal. The APS-C sized sensors used in many mirrorless cameras are a good choice. 42mm full frame sensors will also work, but performance will be poor at the edges of the sensor and field illumination will be reduced. Additionally, we do not recommend pairing RASA 8 with any camera body more than 4" in diameter. See the chart below to determine if your camera is compatible with RASA 8. Unique Optical Design RASA's optical design is patented (US 2016/0299331 A1). The design consists of a Schmidt corrector, primary mirror, lens group, and optical window. The lens group contains 4 elements and utilizes rare-earth elements. Unlike many telescopes that only perform well over the visible spectrum (400-700nm), the 8" RASA's optics are designed to perform over a wider spectral range, from 390-800nm. This allows more of the light emitted from the astronomical object to be sharply focused in the image. With many imaging systems, adding an extra piece of flat glass such as a filter does not change optical performance. However, that is not the case with super-fast optical systems like the RASA. Our engineers addressed this by designing the RASA with a removeable optical window, so you can maintain peak optical performance if a filter is added or if a camera has its own optical window. Celestron offers a Light Pollution Imaging Filter designed specifically for the 8" RASA, which mounts in place of the optical window. All refractive optical surfaces are coated with StarBright XLT coatings, while the primary mirror uses enhanced aluminum coatings. This maintains high light transmission through the entire optical system. When compared with "Hyperstar SCT" systems, the RASA 8 provides better optical performance and field illumination.FeaturesFlat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.NEW Ultra-Stable Focus System six precision sealed ball bearings virtually eliminate image shift.Integrated air cooling system 12V DC MagLev fan reduces cooldown time and provides optimal air flow while filtering out dust.Internal filter mount seamlessly accommodates a Light Pollution Imaging Filter into the optical path.CGE dovetail mounting rail.Performs over a wider spectral range than most telescopes, from 390-800 nm, so more of the light passing through the astrograph is in sharp focus.SpecificationsOptical DesignRowe-Ackermann SchmidtAperture8" (203mm)Focal Length15.74" (400mm)Focal RationF2.0Central obstruction diameter3.66" (93mm) (46% of aperture diameter)Light Gathering Power843xResolution (Rayleigh)0.68 arc secondsResolution (Dawes)0.57 arc secondsImage Circle0.86" (22mm), 3.15 degreeUseable field1.26" (32mm) , 4.6 Degree, only minimal performance loss at edge of FOVWavelength range390 - 800nmSpot size< 4.6m RMS across image circleOptical CoatingsStarBright XLTOff-axis Illumination93% at 0.43" (11mm) off-axisOptical Window1.81" (46mm)Back focus with included camera adapter0.98" (25mm)Back focus from top of threaded collar1.14" (29mm)Optical TubeAluminumFocuserUltra-Stable Focusing SystemFinderscopeNot includedOther FeaturesAir-cooling system, integrated filter mountDovetailCGE Dovetail BarBattery InfoRequired, includedBattery MaterialAlkalineBattery TypeAABattery Quantity8Optical Tube Diameter9.3" (235mm)Optical Tube Length24.7" (628mm)WeightOptical Tube: 17 lbs (7.7kg) WHO WE ARE
Adorama is one of the nation's largest Photographic retail and mail order suppliers. For over 35 years we have been serving professionals as well as amateurs in the photographic, video, digital imaging and telescope fields. We offer the best combination of quality services, vast selection, knowledgeable staff, and competitive pricing.
Adorama Camera is your #1 source for the best and newest products in the photographic industry, and the largest inventory of items such as Digital Cameras, Digital Camera Accessories, Memory Cards, 35mm Cameras, Medium Format Cameras, Lenses, Video Cameras, TV's, MP3 Players, Binoculars, Telescopes, Scanners, Inkjet, Dye-Sub & Laser Printers, Office Fax machines, Shredders, Projectors, Inkjet Paper, Photographic Accessories, Filters, Batteries, Cases, Tripods, Flashes, Lighting & Studio Equipment, Film, Darkroom Products and Audio Video Equipment.
All new equipment comes with all of the factory included accessories, including a full manufacturer's warranty, unless otherwise noted.
We only post items that are in-stock and ready to ship.
PAYMENT
In an effort to comply with our Authorized Dealer contracts with the manufacturers and to best control our inventory levels we reserve the right to limit quantities or cancel orders to Resellers and Exporters.
Please note: Inventory is not reserved until the item is paid for.
Please include a phone number as the carriers and our Trucking Companies require it.
INTERNATIONAL
International taxes and duties: International shipments may be subject to import fees, duties and taxes, which are levied once a shipment reaches the respective country, in addition to the brokerage fees/custom clearance charges which may be imposed by the carrier. These charges must be borne by the recipient. Adorama has no control over these charges and cannot predict what they might be. Orders shipped using eBays (GSP) "Global Shipping Platform" have already paid their taxes and must contact eBay directly for any issues.
SHIPPING
Adorama's eBay store ships to the 48 Contiguous United States. We do not ship to APO & FPO, Alaska, Hawaii and Puerto Rico.
We now ship many items to Canada, parts of Europe and Australia. If the item does not have the option, please don't ask.
We do not ship to other International locations.
Items with "free shipping" are only shipped free to the 48 contiguous United States.
Combined shipping is available by using the Add-to-Cart button and confirming that the shipping carriers for each item are the same BEFORE making the Payment. eBay's new checkout will then consolidate your items and present to you the better shipping rates.
All orders must be shipped with a printed invoice included. We can not ship orders without the invoice or a lower value invoice. Gift Invoices may be requested if you contact us immediately after payment during business hours. No guarantees for other times.
Shipment errors due to a bad address entered by the buyer and will not be credited for shipping charges if returned or at all if lost or abandoned by the carrier.
We supply tracking information directly to your eBay account within 24 hours after the shipment leaves our warehouse. Please make sure to check your eBay email address and that it does not go into spam or junk. Approved Change Requests may not be updated on eBays portal, please check the emails.
Returns
For the first 30 days from date of receipt of your purchase you may return the merchandise for a full money back refund, excluding any shipping charges (for items which we offer free shipping, our standard shipping charges will be deducted from any refund or credit).
Returned or exchanged products must be in brand-new, mint condition. Items must be in the original, undamaged manufacturer's packaging with all packaging materials, including instruction booklets, packing inserts, and the blank warranty cards. Memory cards and any other Blister Pack items are not returnable once opened. Any merchandise missing the original Universal Product Code (UPC) cannot be returned. The manufacturer's labeled packaging must be enclosed within an additional shipping carton. Please do not place stickers or shipping labels on the original manufacturer's package.
Printers are not returnable once the Toner Cartridges have been installed or released.
Desktop Computers, Laptops, Tablets & Notebooks are not returnable once they have passwords or other software installed, have been registered with or returned to the manufacturer for any reason.
Please use the Return this Item or Contact Seller button on your Purchase History page to ask us any questions or request a return. Adorama cannot accept COD or freight-collect shipments.
Please enclose a copy of your invoice with your return and tell us whether you would like the item to be replaced or refunded.
Returns can take up to 8 days in-house from the date we receive it to process.
When returning an item, please make sure you use a shipper which provides you with Insurance and a tracking number. Items returned without a tracking number might take much longer to be processed.
If you live in New York you may bring the return to our Manhattan store for exchange or refund.
Hours of operation
Mon-Thurs: 9:00am - 6:00pm
Friday: 9:00am - 1:00pm
: 12pt;"> 9:00am - 6:00pm
Friday: 9:00am - 1:00pm
