Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph Telescope (OTA only)

Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph Telescope (OTA only)

Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph Telescope (OTA only)

B&H # CE11ROTA MFR # 91075
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Product Highlights

  • 11" Diameter Aperture
  • 620mm Focal Length/ f/2.2 Focal Ratio
  • StarBright XLT Optical Coating System
  • 4-Element Rare-Earth Optical Glass
  • Quiet, High-Output 12V MagLev Fan
  • Large 43.3mm Imaging Circle
  • Long 55mm Back Focus
  • 10:1 FeatherTouch Micro Focuser Knob
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  • 1Description

The 11" f/2.2 Rowe-Ackermann Schmidt Astrograph Telescope from Celestron is specifically designed for astrophotography and astroimaging with a large 11" aperture and fast f/2.2 focal ratio. The OTA is being offered by itself without a mount, and comes with a Celestron CGEM-style dovetail plate for use on compatible mounts and tripods. Using 4-element rare-earth optical glass lenses ensures accurate color rendition and elimnates 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. A 12V MagLev fan reduces cooldown time and provides optimal airflow through the optical tube while filtering harmful dust from the interior.

The 43.3mm imaging circle is made to cover today's large DSLR and CCD imaging sensors to capture full-frame shots with vignetting, while a fast focal ratio reduces exposure times without sacrificing image quality and gives the user more time for multiple shots of the same object for layering or with different filters. A custom-designed FeatherTouch micro focus system has a 10:1 reducer with linear brass focuser bearing to 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. Since this OTA is designed as an imaging scope, a 42mm T-thread camera adapter and 48mm camera adapter are provided. Other adapters are available if required.

Optical Performance
  • 11" diameter aperture
  • 620mm focal length
  • Fast f/2.2 focal ratio
  • Proprietary StarBright XLT fully multicoated optical system
  • 4-element rare-earth glass for true color rendition without aberrations across the entire field of view
  • 43.3mm image circle captures pinpoint stars on today's large CCD and DSLR imaging chips
  • Resolution: 0.5 arc sec (Rayleigh), 0.41 arc sec (Dawes)
StarBright XLT Coating System
  • Multi-layer mirror coatings made from layers of aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and Si02 (silicon dioxide)
  • Reflectivity is flat across the light spectrum, for both astrophotography/astroimaging and visual observation
  • 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
  • Linear brass focuser-bearing reduces image shift
  • Dual-speed 10:1 FeatherTouch micro focus knob provides precise focusing
Construction Details
  • 42mm T-thread and M48 camera adapters included for attachment to CCD and DSLR cameras
  • Heavy duty CGEM dovetail plate
  • 12VDC MagLev fan reduces cool-down time, provides airflow, and filters dust
UPC: 050234910750
In the Box
Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph Telescope (OTA only)
  • 42mm T-Adapter
  • 48mm Camera Adapter
  • Limited Two-Year Warranty
  • Table of Contents
    • 1Description
    Optical Design Rowe-Ackermann Schmidt
    Aperture 11.0" / 27.9 cm
    Focal Length 620mm
    Focal Ratio f/2.2
    Back Focus 2.2" / 5.5 cm, from front lens assembly
    Eyepiece Barrel Diameter N/A
    Diagonal None
    Finderscope None
    Tripod None
    Mount Type CGEM dovetail plate
    Power Requirement 12 VDC for fan operation
    Length 33.0" / 83.8 cm
    Weight 43.0 lb / 19.5 kg
    Packaging Info
    Package Weight 57.0 lb
    Box Dimensions (LxWxH) 39.0 x 20.0 x 19.0"

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