Celestron 11" f/2.2 Rowe-Ackermann Schmidt Astrograph Telescope (OTA only)
Product #26474
SKU 91075
Usually ships in 2 - 3 weeks

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

Product #26474 | SKU 91075
Usually ships in 2 - 3 weeks

11" Diameter Aperture, Fast f/2.2 Focal Ratio, 620mm Focal Length
Our Price $7,899.00

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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 the improved StarBright XLT multi-coating system, light transmission is increased throughout the entire optical path with anti-reflection multicoated lenses, highly reflective multicoated mirrors, and 4-element rare-earth glass.

A 70mm imaging circle is made to cover today's large DSLR and CCD imaging sensors to capture full-frame shots. Its 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, or to change subjects completely. A custom-designed 10:1 linear brass focuser enables very precise focusing to clearly resolve topographic details on the Moon, virtually remove comas and corona from distant 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.

Key Features

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 colour rendition without aberrations across the entire field of view
  • 70mm image circle captures pinpoint stars on today's large CCD and DSLR imaging chips

StarBright XLT Coating System

  • Multi-layer mirror coatings made from layers of aluminium, 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

Use and Handling

  • Linear brass focuser-bearing reduces image shift
  • Dual-speed 10:1 FeatherTouch micro focus knob provides precise focusing
  • Heavy duty CGEM dovetail plate

Construction Details

  • 42mm T-thread and M48 camera adapters included for attachment to CCD and DSLR cameras
  • 12VDC MagLev fan reduces cool-down time and provides airflow


Optical Design
Rowe-Ackermann Schmidt
11" (27.9 cm)
Focal Length
620 mm
Focal Ratio
Back Focus
2.2" (5.5 cm), from front lens assembly
Eyepiece Barrel Diameter
Mount Type
CGEM dovetail plate
Power Requirement
12 VDC for fan operation
33" (83.8 cm)
35 lb (15.9 kg)


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