Celestron RASA 8 8-Inch Rowe-Ackermann Schmidt Astrograph
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Brand | Celestron |
Optical Tube Length | 8 Inches |
Eye Piece Lens Description | Plossl |
Objective Lens Diameter | 42 Millimeters |
Telescope Mount Description | Equatorial Mount |
Focus Type | Manual Focus |
Finderscope | Not included |
Item Weight | 22 Pounds |
Lens Coating Description | 390 - 800 nm |
Focal Length Description | 400mm (15.74") |
About this item
- 8-inch optical tube assembly - 42 mm T-thread camera adapter - C-thread camera adapter - Fan Battery Pack - 2-Year Warranty
- Flat 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.
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This Item Celestron RASA 8 8-Inch Rowe-Ackermann Schmidt Astrograph | Recommendations | dummy | dummy | |
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Price | $2,079.00$2,079.00 | $53.95$53.95 | $2,849.00$2,849.00 | $1,599.00$1,599.00 |
Delivery | — | Get it as soon as Tuesday, Apr 2 | Get it as soon as Monday, Apr 1 | Get it as soon as Tuesday, Apr 2 |
Customer Ratings | ||||
Tech Support | — | — | 3.7 | 3.5 |
Portability | — | — | 3.5 | 3.8 |
Sold By | Celestron Direct | Amazon.com | Adorama | Amazon.com |
focus type | Manual Focus | Manual Focus | Manual Focus | Manual Focus |
eye piece lens | Plossl | — | Plossl | Plossl |
objective lens diameter | 42 millimeters | 8 inches | 235 millimeters | 203 millimeters |
telescope mount | Equatorial Mount | — | GoTo | Altazimuth Mount |
lens coating | 390 - 800 nm | — | StarBright XLT | — |
weight | 22 pounds | 0.7 pounds | 36 pounds | 10.88 kilograms |
power source | — | Battery Powered | Battery Powered,Corded Electric | Battery Powered |
finderscope | Not included | Reflex | Reflex | Reflex |
optical tube length | 8 inches | — | — | 432 millimeters |
Product Description
Capture spectacular wide-field deep sky images in seconds with Celestronâs portable astrograph, the 8â Rowe-Ackermann Schmidt Astrograph (RASA). This incredibly fast f/2.0 system is the perfect companion to todayâs 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, itâs easy to transport your 8â RASA to the most remote dark sky locations.  RASA Performance Made for Everyone The 8â 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 8â version is a much more portable and affordable version of the heralded RASA 11, which was introduced to much acclaim in 2014. With the 8â 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 âbig brotherâ RASA 11, including the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar. Purely designed for imaging, the 8â 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 âReal-Timeâ 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 âlive stackingâ software, the 8â 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 wonât need to accurately track over extended periods. The 8â RASAâs 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 8â RASA, Celestron is unveiled a 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 a precision linear ball bearing, which is tested during assembly to ensure optimal results.  Built for Todayâs Latest Cameras Unlike the larger RASAs that work with DSLR and large CCD cameras, the 8â 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 4â in diameter. See the chart below to determine if your camera is compatible with RASA 8.  Camera Compatible with RASA 8? Adapter required Astronomical CMOS/CCD camera with C-mount Yes C-mount adapter (included) Astronomical CMOS/CCD camera with M42-thread mount Yes M42 adapter (included) with M42 extension tubes (not included) Astronomical CMOS/CCD camera with other mount Yes Custom camera adapter Canon mirrorless with APS-C sensor Yes Canon mirrorless adapter (sold separately) Sony mirrorless with APS-C sensor Yes Sony mirrorless adapter (sold separately) Canon mirrorless with full frame (42mm) sensor Yes, but not optimized across the full sensor Canon mirrorless adapter (sold separately) Sony mirrorless with full frame (42mm) sensor Yes, but not optimized across the full sensor Sony mirrorless adapter (sold separately) DSLR No --
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Product information
Product Dimensions | 9.1 x 9.1 x 9.1 inches |
---|---|
Item Weight | 22 pounds |
ASIN | B07N99B9JB |
Item model number | 91073 |
Customer Reviews |
5.0 out of 5 stars |
Best Sellers Rank | #6,191 in Camera & Photo Products (See Top 100 in Camera & Photo Products) #53 in Catadioptric Telescopes |
Date First Available | January 22, 2019 |
Manufacturer | Celestron |
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Important caution: Imaging at F/2 has its unique learning curve. The most important thing is make sure the spacing requirement is precisely satisfied. The critical focus zone is of the order of microns. If you are not seeing perfect round stars on the edges out of the box, DO NOT COLLIMATE the scope before you checked back focus and tilting. High quality parts such as those offered at PreciseParts.com can be of tremendous help. Collimation is rarely the problem. They are usually fine out of the box.
Reviewed in the United States on August 3, 2020
Important caution: Imaging at F/2 has its unique learning curve. The most important thing is make sure the spacing requirement is precisely satisfied. The critical focus zone is of the order of microns. If you are not seeing perfect round stars on the edges out of the box, DO NOT COLLIMATE the scope before you checked back focus and tilting. High quality parts such as those offered at PreciseParts.com can be of tremendous help. Collimation is rarely the problem. They are usually fine out of the box.
Reviewed in the United States on January 28, 2022