Celestron CGX RASA 8 Computerised Telescope

SKU
CLS-12058
OUR PRICE $7,999.00

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    This kit consists of the 8” Rowe-Ackermann Schmidt Astrograph (RASA) with Celestron's sleek CGX German equatorial mount. All you need is to simply attach your camera and you'll be taking spectacular astrophotography of wide-field deep sky objects in no time.

    Despite being the same size as the CGEM II, Celestron's CGX is a big step up in performance and features, especially for imaging applications. 


    RASA Performance Made for Everyone:

    Capture spectacular wide-field deep sky images in seconds with Celestron’s new portable astrograph - the CGX Equatorial 800 RASA Telescope! This incredibly fast f/2.0 system is the perfect companion to today’s color astronomical CMOS cameras, smaller CCD cameras, and mirrorless cameras, and allows you to produce sharp, detailed images (skipping the autoguider completely in many cases). Furthermore, it's convenient and easy to transport at just under 8kg. Note that the 8" RASA is purely designed for imaging and cannot be used visually.

    The latest addition to the RASA family, this 8” version is a much more portable and affordable version of the famous RASA 11. It delivers the same quality flat field without optical abberations, allowing you to capture stunning deep-sky astronomical images without the difficulties of longer focal length instruments, doing so at a much lower cost! 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.

    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. The RASA will show images on a computer instantly that are brighter and more detailed than those using much bigger telescopes with the naked eye.

    Ultra-Stable Focus System:

    Focusing is easier, more accurate, and more stable than ever! Celestron unveiled a new focuser design that mitigates lateral movement of the primary mirror when focusing or tracking. The key to their ultra stable focus system is two sets of precision bearings that are precisely aligned (and individually tested during assembly) to ensure perfect results.

     

    Built for Today’s Latest Cameras:

    Unlike the larger RASAs that are designed specifically for DSLR and large CCD cameras, the 8” RASA was specifically created 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, and 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:

    Camera Compatible with RASA 8? Adapter required
    Astronomical CMOS/CCD camera with C-mount Yes C-mount adapter (included)
    Astronomical CMOS/CCD camera with other mount Yes M42 adapter (included) with M42 extension tubes (not included)
    Canon mirrorless with APS-C sensor 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 --

     

    Unique Optical Design:

    RASA’s optical design is patented. 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.

    Celestron's engineers designed 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, whilethe primary mirror uses enhanced aluminum coatings. This maintains high light transmission through the entire optical system.

     

    CGX Mount and Tripod Features:

    The new CGX was designed to better support your telescope for both visual and astro-imaging pursuits. It is Celestron's new equatorial backbone to support a wide range of telescopes.

      • Sturdier and more rigid with quicker dampening time
      • Increased load capacity to 25kg
      • Improved motors provide more torque, better slewing and tracking under heavy loads
      • Heavy duty belt-drive system minimizes 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 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 3°-65° latitude range
      • Dual-fit CG-5/Vixen and CGE/Losmandy dovetail saddle

       

      Compatible with:

       


      Optical Tube Info:

      Optical Design

      Rowe-Ackermann Schmidt Astrograph

      Aperture 

      203mm (8")

      Focal Length

      300mm (15.74")

      Focal Ratio

      f/2.0

      Central obstruction diameter

      93mm (3.66") 

      Resolution (Rayleigh)

      0.68 arc seconds

      Resolution (Dawes)

      0.57 arc seconds

      Image Circle

      22mm (.86") Ø, 3.15°

      Useable Field

      32mm (1.26") Ø, 4.6°, only minimal performance loss at edge of FOV

      Wavelength Range

      390 - 800nm

      Spot Size

      < 4.6 μm RMS across FOV

      Optical Coatings

      StarBright XLT

      Off-Axis Illumination

      93% at 11mm (.43") off-axis

      Optical Window

      46mm (1.81") Ø

      Back focus with included camera adapter 

      25mm (.98")

      Back focus from top of threaded collar

      72.8mm (2.86")

      Optical Tube

      Aluminium

      Optical Tube Length

      628mm (24.7")

      Optical Tube Diameter

      235mm (9.3")

      Focuser

      Ultra-Stable Focusing System

      Finderscope

      Not included

      Optical Tube Weight

      7.7kg

      Other Features

      • Air-cooling system
      • Integrated filter mount

      Included Items

      • M-42 camera adapter
      • C-thread camera adapter
      • Fan battery pack

      Dovetail

      CGE Dovetail Bar

      Mount Info:

      Mount Type

      Computerised Equatorial

      Instrument Load Capacity

      25kg

      Height adjustment range (includes mount and tripod)

      1200.15mm - 1968.5mm

      Tripod Leg Diameter

      50.8mm 

      Latitude adjustment range

      3° - 65°

      Mount Head Weight

      20kg

      Accessory Tray

      Yes

      Tripod Weight

      8.7kg

      Weight of Counterweights

      2 x 11lbs (5kg)

      Slew Speeds

      9 slew speeds - max speed 4°/second

      Tracking Rates

      Sidereal, Solar, and Lunar

      Tracking Modes

      EQ North & EQ South

      GPS

      N/A

      Dovetail Compatibility

      Dual saddle plates (Vixen and CGE saddle)

      Auxiliary ports

      2 Aux ports (Hand Control can use either Aux port)

      Autoguide port

      Yes

      USB Port

      1 port (for Mount and Hand Control)

      Power Requirements

      12V DC, 4 amps

      Motor Drive

      DC servo motors

      Alignment Procedures

      • 2-Star Align
      • 1-Star Align
      • Solar System Align
      • Last Alignment
      • Quick Align

      Periodic Error Correction

      Yes

      Computerized Hand Control

      • Double line, 18 character Liquid Crystal Display; 19 fiber optic backlit LED buttons, USB 2.0 port for PC connection

      NexStar+ Database

      • 40,000+ objects
      • 100 user defined programmable objects 
      • Enhanced information on over 200 objects

      Software

      • PWI Telescope Control Software
      • Celestron's Starry Night Special Edition Software
      • SkyPortal App

      Included Items

      • CGX Equatorial Head
      • CGX Tripod
      • Accessory Tray
      • 2 x 11 lbs (5kg) counterweights 
      • NexStar+ Hand Control
      • 8mm Allen wrench
      • 12V DC Power Cable
      • Hand Control Holster

      About Celestron
      Celestron was founded by Tom Johnson whose first telescope design was a simple 6-inch reflector, built for his young son. He gradually progressed to making larger scopes in more sophisticated designs. Today, the Celestron company is an industry leader in designing and manufacturing optical equipment including telescopes (computerised and non-computerised), binoculars, spotting scopes and its accompanying accessories. Celestron's legacy spans 50 years, and has grown to enjoy recognition from amateurs to serious astronomers globally. The company seeks to remain innovative by growing its product offerings, while supporting science education around the world.

      More Information
      Aperture 203mm (8")
      Focal Length 400mm (15.74")
      Focal Ratio f/2.2
      Mount Type German Equatorial
      Finderscope Make Not included
      Tube Length 628mm (24.7")
      Electronic Hand Control Yes
      Motor Drive Yes
      Warranty Information 2 Years Warranty
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