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Celestron 8" RASA Rowe-Ackermann Schmidt Astrograph Telescope with CGX Goto EQ Mount
Celestron 8" RASA Rowe-Ackermann Schmidt Astrograph Telescope with CGX Goto EQ Mount

Celestron 8" RASA Rowe-Ackermann Schmidt Astrograph Telescope with CGX Goto EQ Mount

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Your Price: CAD4,889.00
Usually ships in 5-7 business days
Part Number:12058

Choose Options or Accessories if Applicable

Camera Adapters and Imaging Accessories
Imaging Cameras/Autoguider
Barlow Lenses
Eyepiece and Filter Kits
Filters
Miscellaneous

Sky & Telescope’s Hot Products 2019 Award

"Incredibly fast optical speeds allow deep-sky imaging with short exposures, opening up a new world of scientific- and recreational-astrophotography possibilities."

Product Highlights
  • Patented Catadioptric Astrograph Design
  • 400mm Focal Length/ f/2.0 Focal Ratio
  • StarBright XLT Optical Coating System
  • 4-Element Rare-Earth Optical Glass
  • Includes Photo & Video T-Adapters
  • CGX Motorized GoTo Mount with Tripod
  • High-Torque Dual-Axis Servo Motors
  • NexStar+ Computer Hand Controller
  • Backlash Compensation and PPEC
  • Not Recommended for Visual Use

The Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (RASA) is specifically designed for astrophotography and astro-imaging with a large aperture and fast focal ratio. Using four-element rare-earth optical glass lenses ensures accurate color rendition and eliminates aberrations such as coma and field curvatures. The improved StarBright XLT multi-coating system, which includes anti-reflection coatings on the lenses and highly reflective coatings on the mirrors, increases light transmission throughout the entire optical path. An integrated fan reduces cooldown time and provides optimal airflow through the optical tube assembly (OTA) while filtering harmful dust from the interior.

The astrograph design is defined by its fast focal ratio, which reduces exposure times without sacrificing image quality and gives you more time for multiple shots of the same object for layering or with different filters. Its internal Ultra-Stable focusing mechanism enables very precise focusing to clearly resolve topographic details on the Moon or split double stars and reveal details of most other celestial objects in between, while minimizing unwanted lateral movement of the primary mirror when focusing or slewing. Since this OTA is designed as an imaging scope, a 42mm camera T-adapter and C-mount imager adapter are included that are compatible with most camera-specific T-rings that are widely available.

Optical Performance
  • 203mm (8") diameter aperture enables near- and deep-sky viewing without being prohibitively large or heavy for easy transport to viewing locations
  • 400mm focal length helps to produce a fast focal ratio
  • Fast f/2.0 focal ratio requires significantly lower exposure times versus slower ratios to produce the same results
  • Rowe-Ackermann Schmidt astrograph (RASA) design is purpose built for astrophotography and imaging performance, and is not recommended for visual use
  • Proprietary StarBright XLT fully multi-coated optical system
  • Four-element rare-earth glass for true color rendition without aberrations across the entire field of view
  • Wide 390-800nm spectral range improves images of deep space objects like galaxies and nebulae
  • Image circle: 22mm (0.86")
  • Resolution: 0.68 arcsec (Rayleigh), 0.57 arcsec (Dawes)
  • Back focus: 25mm (0.98") with included camera adapter, 29mm (1.14") from top of threaded collar
  • Optical window can be removed and replaced with optional filters such as a light pollution filter
  • Integrated cooling fan brings optical system to ambient air temperature for better performance
  • Runs on eight user-supplied AA batteries or optional 12VDC power adapter
StarBright XLT Coating System
  • Multi-layer mirror coatings made from layers of aluminum, SiO2 (silicon dioxide), and TiO2 (titanium dioxide)
  • Reflectivity is flat across the light spectrum, for both astrophotography/astro-imaging
  • Multi-layer anti-reflective coatings made from layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide)
  • High-transmission water white glass corrector lens with 97.4% light transmission
Focuser
  • Focusing system moves primary mirror forward and back to achieve tack-sharp images
  • Ultra-stable design minimizes unwanted lateral movement of the primary mirror when focusing or slewing
  • Fine adjustments for precise focusing, approximately 30 turns of the knob runs through the focus range
Mounting
  • OTA only, mount and tripod required for proper use
  • Includes large CGE/Losmandy-D dovetail plate for use on larger more stable mount heads
  • Weight: 17 pounds
Included Accessories
  • Standard M42 camera T-adapter accepts most camera-specific T-rings to directly mount DSLR and mirrorless cameras
  • CCTV/Imager C-thread adapter accepts most camera-specific video T-rings to mount imaging and video cameras
  • Battery pack takes eight user-supplied AA batteries to power the integrated cooling fan

CGX GoTo EQ Mount with Tripod

Celestron's CGX GoTo EQ Mount with Tripod improves on their venerable CGEM platform to provide users with a heavy-duty research-quality mount for larger optical tube assemblies (OTAs), accessories, and imaging rigs. Engineered to carry a 55-pound payload and outfitted with high-torque motors with a heavy-duty belt-drive system to improve tracking stability and reduce backlash, it is able to smoothly and accurately track near- and deep-sky objects for long periods of time. Its Vixen/Losmandy dual dovetail saddle makes the mount compatible with most plates in use today. To provide a stable platform for the mount and your OTA, a heavy-duty stainless steel tripod is included that sports large 2"-diameter legs, an accessory tray that doubles as a stabilizer, and an adjustment range from 47.25 to 77.5" including the head.

The brain of the CGX EQ is the NexStar+ computer controller. Equipped with a database of 40,000 objects, including the planets, stars, nebulae, galaxies, and the complete Messier catalog, it can also be programmed with up to 100 custom user-defined objects and filters for custom object lists. Its intuitive menu-driven user interface allows you to observe the heavens with nine slew speeds and three tracking rates, plus anti-backlash compensation and Permanent Periodic Error Correction (PPEC) for smoother movements in the motors and improved tracking over time. Features such as guided tours, extended information on 200 popular objects, and multiple alignment options make the NexStar+ controller easy to use and invaluable to new users and experienced stargazers.

Mount
  • German equatorial mount
  • 55 lb payload capacity
  • 3-65° latitude adjustment range
  • 20° of additional tracking past the meridian provides greater usability
  • Dual-axis servo motors with optical encoders for smooth tracking and quiet operation
  • High-torque motors provide smooth tracking and slewing for heavy OTAs
  • Internal belt-drive system provides smooth, vibration-free tracking while minimizing backlash
  • Spring-loaded brass worm wheel and stainless steel worm gear reduce friction and improve gear meshing
  • Limit sensors automatically shut off slewing or tracking before reaching the hard stop fail safe
  • Internal hard stops for both axes prevent cable tension and tripod strike
  • Autoguider port for making corrections while astroimaging
  • Dual Vixen/Losmandy dovetail saddle, compatible with CG-5 and CGE bars
  • Long clutch levers make tightening and loosening of clutches easier for manual movement
  • Internal "Real Time Clock" keeps time and site information saved when power is turned off
  • Internal cables/wires for snag-free operation
  • Runs on included 12 VDC, 4A car/vehicle power supply
NexStar+ Hand Controller
  • Features:
  • Intuitive menu-driven user interface
  • Nine slew speeds: 2x, 4x, 8x, 16x, 32x, 0.3°/sec, 1.0°/sec, 2°/sec, 4°/sec
  • Three tracking rates: Sidereal, Lunar, and Solar
  • Anti-backlash correction: Trains out intrinsic play in gears for smoother movement and tracking
  • Permanent Periodic Error Correction (PPEC): Improves tracking precision for long-exposure astrophotography and imaging
  • Database:
  • 40,000-object database
  • 400 user-defined objects for customization
  • Filters for creating custom object lists
  • Solar System: All seven planets plus the Moon, Sun, and Pluto
  • Custom lists of all the brightest stars, double stars, variable stars, and asterisms
  • Custom lists of all the best galaxies, nebulae, and clusters, as well as the complete Messier catalog and select NGC objects
  • Functions
  • Alignment options: One or Two-star, Solar system, Quick, and Last
  • Sky Tour: Based on location, date, and time, the system shows the best objects in the sky and automatically slews to them
  • Object info: Provides useful information about the selected object such as magnitude and constellation; includes extended information about 200 popular objects
  • Physical characteristics:
  • 2-line, 18-character LCD window with red backlighting for comfortable viewing without affecting night-adjusted vision
  • 19 function keys, backlit in red
  • Mini-USB port: Connect to a computer, for use with software programs for point-and-click slewing capability and updating firmware via PC
Tripod
  • Stainless steel legs
  • Adjustable-height 47.25-77.5", including head
  • Heavy-duty 2" diameter
  • Wide leg stance provides greater stability, especially on uneven ground
  • Accessory/eyepiece holder tray that doubles as a leg spreader/lock
  • Weight: 19.2 pounds
Specifications
  • 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (OTA Only)
    Optical Design Rowe-Ackermann Schmidt
    Aperture 8.0" / 203mm
    Focal Length 400mm
    Focal Ratio f/2.0
    Back Focus With included camera adapter: 0.98" / 25mm
    From top of threaded collar: 1.14" / 29mm
    Eyepiece Barrel Diameter N/A
    Diagonal None
    Finderscope None
    Tripod None
    Mount Type Losmandy-D/CGE dovetail plate
    Power Requirement 8 x AA batteries
    12VDC, 100mA power adapter
    Dimensions Length: 24.7" / 62.8 cm
    Diameter: 9.3" / 23.5 cm
    Weight 17.0 lb / 7.7 kg
  • CGX GoTo EQ Mount with Tripod
    Mount Type Equatorial
    Load Capacity 55.0 lb / 24.9 kg
    Motor Dual-axis servo with heavy-duty belt-drive system
    GoTo Capability Yes, NexStar+ hand controller
    Latitude Adjustment Range 3 - 65°
    Polar Axis Scope None
    Tripod Adjustable height of 47.25 - 77.5" / 120 - 197 cm, including head
    Stainless steel
    2"-diameter legs
    Power Source 12 VDC, 4 A
    Weight Mount head: 44.0 lb / 20.0 kg
    Tripod: 19.2 lb / 8.7 kg
    Packaging Info
    Box Dimensions (LxWxH) 46.5 x 13.8 x 13.0"




In the Box
Bundle Items
8" f/2.0 Rowe-Ackermann Schmidt Astrograph (OTA Only)
  • 42mm Camera T-Adapter
  • C-Thread Imaging Adapter
  • Fan Battery Pack
  • Limited 2-Year Warranty
CGX GoTo EQ Mount with Tripod
  • NexStar+ Hand Control (EQ)
    2 x
  • 11 lb Counterweight for Advanced VX
  • Stainless Steel Tripod
  • Counterweight Shaft
  • 12 VDC Car/Vehicle Power Adapter
  • Limited 2-Year Warranty


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