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

SKU: CLS-12058

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  • The 8” RASA 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

  • Performs over a wider spectral range than most telescopes, from 390-800nm, so more of the light passing through the astrograph is in sharp focus.

  • 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 (Its six precision sealed ball bearings virtually eliminate image shift)

  • Internal filter mount (seamlessly accommodates a Light Pollution Imaging Filter into the optical path)

  • The drive system utilizes low cog DC Servo motors for smooth, accurate slewing and tracking performance with minimal backlash.

  • Fully remote imaging capable, with optical limit switches, home sensors, through-mount cabling, and hard stops.

  • Includes Celestron PWI software allows direct computer control via USB 2.0 connection.

  • Proven NexStar+ computerized 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.

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Regular Price: $6,845.00

Special Price $6,499.00

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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.

    Additional Information

    Additional Information

    Eyepiece 1 No
    Eyepiece 2 No
    Finderscope Make Not included
    Electronic Hand Control Yes
    Motor Drive Yes
    Focal Ratio f/2.2
    Focal Length 400mm (15.74")
    Mount Type German Equatorial
    Aperture 203mm (8")
    Tube Length 628mm (24.7")
    Highest Magnification No
    Warranty Information 2 Years Warranty
    Additional Specifications of Product No

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