Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (OTA Only)

Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (OTA Only)

Celestron 8" f/2.0 Rowe-Ackermann Schmidt Astrograph (OTA Only)

B&H # CE8RASAOTA MFR # 91073
New Item - Special Order
Expected availability: Feb 20, 2019

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
  • Ultra-Stable Internal Focusing Mechanism
  • Includes Photo & Video T-Adapters
  • Integrated Cooling Fan
  • CGE/Losmandy-D Dovetail Plate
  • OTA Only, Mount and Tripod Required
  • Not Recommended for Visual Use
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Mount Options: OTA Only

CGEM II GoTo EQ Mount with Tripod

More on the Way

CGX GoTo EQ Mount with Tripod

Special Order

CGX-L GoTo EQ Mount with Tripod

Not available with current selections

OTA Only

Aperture: 8", f/2.0

11", f/2.2 14", f/2.2

Special Order

8", f/2.0

This item is noncancelable and nonreturnable.

New Release!
$0 VA Sales Tax Collected on This Item
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Celestron Rowe-Ackermann overview

  • 1Description

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
  • 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
  • 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
UPC: 050234910736
In the Box
Celestron 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
  • Table of Contents
    • 1Description

    Celestron Rowe-Ackermann specs

    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

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