Celestron CGX Equatorial 8" (800) Rowe-Ackermann Schmidt Astrograph (RASA) Telescope

£4,150.00✓ 2 year warranty

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Out of stock due 15-20 working days

About this product

Model:  cel_cgx_800_rasa_12058
Part Number:  12058

RASA 800 Telescope

Capture 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. 

Key Features

  • 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.
  • 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.

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. 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 Cameras

Unlike the larger RASAs, the 8" model is not suitable for use with DSLR cameras. Instead it has been optimised for use with cameras that have sensors with a diagonal size ~22mm, which gives an image circle of 3.15°. This makes it an excellent choice for use with today's highly popular CMOS deep sky cameras, such as the ASI183 & ASI1600 series from ZWO. Starlight Xpress' compact CCD cameras also work very well. And whilst ~22mm diagonal is optimal the RASA 8 can also be used with larger sensors up to 32mm diagonal, including the APS-C sized sensors used in many mirrorless cameras, though some compromise must be expected at the image periphery. Celestron advise camera bodies should be less than ~100mm / 4" in diameter. 

Camera adapters to connect C-mount cameras and cameras which mount with M42 threads are included. Celestron offers optional adapters to connect your 8” RASA to Sony or Canon mirrorless cameras.

Motorised Focus

Celestron's newly announced Focuser Motor (available separately) provides precise electronic focus control using a Celestron handset (if using a Celestron mount) or via a PC using the supplied focuser utility software or a number of 3rd party programs (e.g. Sequence Generator Pro, Maxim DL etc). 

NOTE: The Celestron RASA is a fast astrograph telescope so best suited to experienced astronomers. 

Celestron CGX Mount

For eight years, Celestron’s workhorse CGEM mount lineup has been the German Equatorial backbone for telescopes ranging from 6 to 11 inches of aperture. Since that time, many more astro-imagers and planetarium controlled setups have emerged as backyard telescope technology has evolved. Celestron’s engineering team applied their years of experience designing German Equatorial mounts to the all-new CGX EQ, a culmination of all the advancements made to Celestron’s technologies, value, and ease-of-use.

The new CGX was designed to support your telescope for both visual and astro-imaging pursuits.  Key design goals included a lower profile EQ head for a more compact and therefore more stable setup; a better drive system; remote operation-friendly with home and limit optical sensors; easier polar alignment adjustments and better cable management. In addition, there are several mechanical and ergonomic improvements to make the mount sturdier, easier to use and transport. 

CGX Intro Video


 

GENERAL FEATURES

  • RASA 8" has 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.
  • 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.

CGX MOUNT FEATURES

  • All-new design. Sturdier and more rigid with quicker dampening time
  • Increased load capacity to 55 lbs.
  • Improved motors provide more torque, better slewing and tracking under heavy loads
  • Heavy Duty belt-drive system minimises backlash while providing smooth motor operation under heavy loads
  • Spring-loaded brass worm wheel and stainless steel worm gear reduce friction and provide optimum gear mesh
  • Internal cabling for worry-free remote operation. Power input and accessory ports remain stationary while the mount slews to avoid snags
  • Internal hard stops for both axes prevents cable tension and tripod strike
  • Internal optical sensors on both axes for simple and safe remote operation
  • Home sensors allow the mount to always start in the index position regardless of orientation before a power reset
  • Limit sensors automatically shut off slewing or tracking before reaching the hard stop fail safe
  • Brand new control software developed in conjunction with PlaneWave Instruments for professional level control operation and imaging
  • Software includes multi-point mount modeling for extremely precise pointing accuracy and many more additional features for remote astroimaging
  • Wider tripod stance for improved stability
  • Adjustable EQ head position to optimize center of gravity over the tripod and fully utilize the increased 3º-65º latitude range
  • Dual-fit CG-5/Vixen and CGE/Losmandy dovetail saddle

IMPROVED TRIPOD FEATURES

  • 2" steel legs with height index marks for quick leveling
  • "Jack of all trays" can hold three 1.25" eyepieces, two 2" eyepieces, your smartphone, or other accessories
  • +20º of additional tracking past the meridian on either side
  • Tripod legs can be collapsed with accessory tray installed for faster setup and transport

CGX MOUNT ERGONOMICS

  • All-new ergonomically designed dovetail clamping knobs
  • Innovative and improved polar alignment adjustment system
  • All-new ergonomic latitude adjuster for smooth and easy adjustment under full loads
  • Optional add-on polar axis finderscope - coming soon

CGX MOUNT ELECTRONICS

  • All-new NexStar+ hand control with USB port
  • Two AUX accessory ports to support wireless/WiFi alignment and operation with StarSense AutoAlign and SkyPortal WiFi Module accessories (sold separately)
  • USB 2.0 port, used to connect directly to PC with included software
  • Autoguider port
  • PPEC ready
  • Threaded 12VDC power input barrel connector
  • Internal Real Time Clock (keeps time and site information saved)

What's in the box

  • Telescope OTA
  • CGX Equatorial Head
  • CGX Tripod
  • Accessory Tray
  • 2x 5kg / 11lbs Counterweight
  • NexStar+ Hand Control
  • DC Power Cable (Cigar Plug)

Specifications

Optical Design Rowe-Ackermann Schmidt
Aperture (mm) 203mm (8")
Focal Length 400mm (15.74")
Focal Ratio f/2.0
Back focus with included camera adapter 25mm (.98")
Back focus from top of threaded collar 29mm (1.14")
Central obstruction diameter 93mm (3.66") 46% of aperture diameter
Finderscope Not Included
Light Gathering Power (Compared to human eye) 843x
Optical Coatings StarBright XLT
Total Telescope Kit Weight 124.2 lbs (56.3 kg)
Resolution (Rayleigh) 0.68 arc seconds
Resolution (Dawes) 0.57 arc seconds
Optical Tube Length 628mm (24.7")
Mount German Equatorial
Instrument load capacity 55 lbs (25 kg)
Tripod height adjustment range 1200.15mm - 1968.5mm (47.25" - 77.5")
Tripod leg diameter 2"
Latitude adjustment range 3º-65º
Tripod Weight 19.2 lbs
EQ Head Weight 44 lbs
Max Slew Speed 5º/second (4º/second is default)
Tracking Rates Sidereal, Solar and Lunar
Number of Auxiliary ports (for hand control and accessories) 2
Autoguide port Yes
USB Port Yes
Software New telescope control PC software

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