RASA 8" has flat field free of optical aberrations like field curvature, coma, astigmatism and chromatic aberration across an entire APS-C sensor.
NEWUltra-Stable Focus System – six precision sealed ball bearings virtually eliminate image shift.
Internal filter mount – seamlessly accommodates a Light Pollution Imaging Filter into the optical path.
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.
The CGX, with its 55 lb. load capacity, is Celestron’s most innovative, state-of-the art, computerised equatorial mount to date, and provides a very sturdy and rigid platform for the fully-loaded RASA 8.
The drive system utilises low cog DC Servo motors with integrated optical encoders, belt and pulley motor connection, spring-loaded steel worm gears supported by precision sealed bearings, and brass worm wheels for smooth, accurate slewing and tracking performance with little backlash.
Fully remote imaging capable, with optical limit switches, home sensors, through-mount cabling, and hard stops.
Included Celestron PWI software allows direct computer control via USB 2.0 connection.
Proven NexStar+ computerised telescope control technology supports functions to address imagers’ needs, such as All-Star Polar Alignment, Permanent Periodic Error Correction (PPEC), and adjustable tracking through meridian.
Capture spectacular wide-field deep sky images in seconds with Celestron’s 8” Rowe-Ackermann Schmidt Astrograph (RASA) portable astrograph mounted on Celestron's state-of-the-art CGX equatorial mount- a perfect astroimaging combination!
The RASA 8" is the latest additional to the Celestron 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.
The Celestron CGX Equatorial mount has been designed from the ground up to provide a solid and accurate platform for your telescope for both visual and astro-imaging requirements. The mount has a number of new and innovative features including a lower profile EQ head, which provides a more compact and stable mount; a better drive system; home and limit optical sensors with internal hard stops making it more remote operation-friendly; internal cable management.
In addition Celestron have made mechanical and ergonomic improvements too. These include conveniently located mount carrying handles to make transport and mounting (and removing) the mount on/off the tripod easier. There are also large latitude and dovetail clamp adjustment knobs to make the CGX easier to set up with your telescope.
The mount can be controlled with software developed in conjunction with PlaneWave Instruments - called CPWI - and is supplied free with the mount. CPWI uses advance PointXP mount modelling that allows you to add 100+ points to an alignment model for the mount set up, for the most accurate pointing and tracking possible for your Celestron telescope. The software also features an All-Star Polar Alignment routine, motor focus control and plate solving.
OPTICAL TUBE INFO:
Rowe-Ackermann Schmidt Astrograph
Central obstruction diameter
93mm (3.66") (46% of aperture diameter)
Light Gathering Power (Compared to human eye)
0.68 arc seconds
0.57 arc seconds
22mm (.86") Ø, 3.15°
32mm (1.26") Ø, 4.6°, only minimal performance loss at edge of FOV
390 - 800 nm
< 4.6 μm RMS across image circle
93% at 11mm (.43") off-axis
46mm (1.81") Ø
Back focus with included camera adapter
Back focus from top of threaded collar
Optical Tube Length
Optical Tube Diameter
Ultra-Stable Focusing System
Optical Tube Weight
17 lbs (7.7 kg)
Air-cooling system, integrated filter mount
M42 camera adapter, C-thread camera adapter, fan battery pack
CGE Dovetail Bar
Instrument load capacity
55 lbs (25 kg)
Height adjustment range (includes mount and tripod)
1200.15mm - 1968.5mm (47.25" - 77.5")
Tripod Leg Diameter
50.8mm (2") Steel tripod with graduated markings on lower section
Latitude adjustment range
3° - 65°
Mount Head Weight
44 lbs (20 kg)
19.2 lbs (8.7 kg)
Weight of Counterweights
2 x 11 lbs
9 slew speeds - max speed 4°/second
Sidereal, Solar and Lunar
EQ North & EQ South
Dual saddle plates (Vixen and CGE saddle)
Number of Auxiliary ports
2 Aux ports (Hand Control can use either Aux port)
Yes, input for Mount and Hand Control
12V DC, 4 amps
DC servo motors
2-Star Align, 1-Star Align, Solar System Align, Last Alignment, Quick Align
Periodic Error Correction
Computerised Hand Control
2 line x 18 character backlit Liquid Crystal Display, 19 LED backlit buttons, USB 2.0 port for PC connection
40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects
PWI Telescope Control Software, Celestron's Starry Night Special Edition Software, SkyPortal App
Total Kit Weight
124.2 lbs (56.3 kg)
CGX Equatorial Head | CGX Tripod | Accessory Tray | 2 x 11 lbs counterweights | NexStar+ Hand Control | 8mm Allen Wrench | 12V DC Power Cable | Hand Control Holster