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Celestron C11-A XLT (CGE) OTA

Celestron C11-A XLT (CGE) OTA
Our Price:  £2,065.00
List Price:  £2,175.00
Saving Of:  £110.00
(Inc. 20% VAT)

Model:  C91036XLT
Brand:  Celestron
Telescope Type:  Schmidt-Cassegrain



In stock, immediate despatch

Celestron Schmidt-Cassegrain Optical Tube Assemblies (OTA) are available individually for use with your favorite mount. Each OTA is made to the same exacting standards as those used on all our high quality telescopes. All optical surfaces are coated with Celestron’s high efficiency StarBright® multi-layered coating group. These tube assemblies are equipped with the same dovetail mounting bar used on the CGE and Advanced Series for easy attachment to a variety of popular mounts.


  • 11" Schmidt-Cassegrain Optical Tube Assembly
  • Aluminum Optical Tube
  • Celestron's premium StarBright XLT coatings
  • 2800 mm focal length (f/10)
  • 40 mm eyepiece included (70x)
  •  Visual back allows for use with 1.25" accessories
  • 9x50 finderscope to help accurately find objects
  • Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • Includes dovetail rail compatible with CGE


  • Optical Design: Schmidt-Cassegrain
  • Aperture (mm): 279.4 mm (11 in)
  • Focal Length: 2800 mm (110 in)
  • Focal Ratio: 10
  • Focal Length of Eyepiece 1 (mm): 40 mm (1.57 in)
  • Magnification of Eyepiece 1: 70 x
  • Finderscope: 9x50
  • Star Diagonal: 1.25
  • Optical Tube: Aluminum
  • Highest Useful Magnification: 660 x
  • Lowest Useful Magnification: 40 x
  • Limiting Stellar Magnitude: 14.7
  • Resolution (Rayleigh): 0.5 arc seconds
  • Resolution (Dawes): 0.42 arc seconds
  • Light Gathering Power (Compared to human eye): 1593 x
  • Secondary Mirror Obstruction: 3.75 in (95 mm)
  • Secondary Mirror Obstruction by Diameter: 34%
  • Secondary Mirror Obstruction by Area: 12%
  • Optical Coatings: StarBright / XLT
  • Optical Tube Length: 24 in (610 mm)
  • Optical Tube Weight: 27.5 lbs (12 kg)
  • Dovetail Compatibility: CGE Mount

Schmidt-Cassegrain Optical Tube Assembly Manual

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