Celestron Advanced VX 8" RASA Astronomy Grovers Optics

Celestron Advanced VX 8" RASA

Rowe Ackermann SCT 200mm flat field imaging system with rare-earth glass for outstanding images free of optical defects

£2,649.00
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Celestron now offer their 8″ high speed, wide field 8” Rowe-Ackermann Schmidt Astrograph (RASA) on their portable strong-yet-portable Advanced VX (AVX) German equatorial mount. Simply add a mirrorless camera or popular CMOS or CCD imaging device, and you can take spectacular images of wide-field deep sky objects.

The Telescope

You can now capture spectacular wide-field deep sky images in seconds with Celestron’s new portable astrograph: the 8” Rowe-Ackermann Schmidt Astrograph (RASA). The latest addition to the RASA family, this 8” version is a much more portable and affordable version of the much heralded RASA 11″ model, which was introduced to the world to much acclaim in 2014. This was followed in 2017 with the gigantic RASA 14″/36cm. With the 8” RASA joining the lineup, a wider range of astroimagers can enjoy the benefits of the patented RASA design. It has many of the same thoughtfully designed features as the RASA 11, including the integrated air-cooling system, internal filter mount, and sturdy CGE dovetail mounting bar.

This incredibly fast f/2.0 system is the perfect companion to today’s colour 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 using an autoguider completely. Weighing in at just 7.7kg (17lbs), 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. 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. Since 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.

Camera Compatibility

Unlike the larger RASAs that work with DSLR and large CCD cameras, the 8” model was designed with colour astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras in mind. The telescope does not work with standard DSLR cameras. It is optimised 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.

CameraCompatible with RASA 8?Adaptor required
Astronomical CMOS/CCD camera with C-mount Yes C-mount adaptor (included)
Astronomical CMOS/CCD camera with M42-thread mount Yes M42 adaptor (included) with M42 extension tubes (not included)
Astronomical CMOS/CCD camera with other mount Yes Custom camera adaptor
Canon mirrorless with APS-C sensor Yes Canon mirrorless adaptor

(sold separately)

Sony mirrorless with APS-C sensor Yes Sony mirrorless adaptor

(sold separately)

Canon mirrorless with full frame (42mm) sensor Yes, but not optimised across the full sensor Canon mirrorless adaptor

(sold separately)

Sony mirrorless with full frame (42mm) sensor Yes, but not optimised across the full sensor Sony mirrorless adaptor

(sold separately)

DSLR No
The Mount

Celestron’s Advanced VX (AVX) series mount is the smallest of its computerised GOTO equatorial mounts and is designed for use with up to medium sized telescopes with the mount able to carry just over 13kg of payload. The AVX has been designed and engineered from the ground up with astroimaging in mind and sets a new standard in mid-level telescope mounts. It provides many of the features that are found on Celestron’s more sophisticated German equatorial mounts, but at an extremely affordable price.

The Advanced VX mount includes ports for a hand control, an autoguider, and 2 AUX ports for optional accessories (e.g. StarSense). The NexStar hand control gives you instant access to all the functions the mount has to offer. With automatic slewing and menu descriptions, any level of astronomer can master this mount in just a few observing sessions. The Advanced VX also has an impressive tripod with 2” diameter steel legs providing an extra-wide stance for improved stability.

The AVX can now be used with Celestron’s PWI (CPWI) software, co-developed with the PlaneWave Instruments, which is an all-in-one solution offering you many of the same features used on PlaneWave’s observatory-class telescopes. The software features a graphical planetarium interface and includes PointXP advanced mount modelling which allows you to add 100 points to your alignment model for the mount for the most accurate pointing and tracking possible. this makes the AVX with the CPWI software and ideal solution for remote access observatory setups. The mount can also be controlled via the ASCOM telescope interface so it can be used with third party software applications.

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Data sheet

Optical Design
Rowe Ackermann SCT
Aperture
8 inch
Mount Type
Advanced VX
Focal Length
400 mm
Focal Ratio
F2
Optical Coatings
Starbright XLT Coating
Optical Tube Length (mm)
628mm
What is more important?
I want to photograph the night sky
Telescope to navigate for you?
Yes, I would like a scope to guide me.

Specific References