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Celestron C11 11" XLT Schmidt-Cassegrain Optical Tube Assembly

£2,175.00
SKU 91067XLT

Availability: Immediate Dispatch

  • 11" Schmidt-Cassegrain Optical Tube Assembly
  • Celestron's premium StarBright XLT coatings
  • Aluminium Optical Tube
  • 2800 mm focal length (f/10)
  • 40 mm eyepiece included (70x)
  • 1.25" visual back 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
  • CG-5 or CGE dovetail rail options
Description

This 11" aperture optical tube assembly (OTA) is an ideal choice if you want a very large aperture telescope that won't break the bank. With its 11" aperture the telescope is still not too large or too heavy to handle meaning that it can be used on a wide range of popular mid-range mounts such as Celestron's Advanced VX. For astroimaging we would recommend the Celestron CGX or CGX-L mount. 

The C11 features Celestron's StarBright XLT coatings on the corrector plate for maximum light transmission. The telescope has a 2800mm focal length (f/10) making it a good overall performer on a range of celestial objects. 

The telescope comes with a star diagonal for more comfortable viewing of high altitude objects and a 40mm Plossl eyepiece which gives 70x magnification. A 9x50 finderscope to help locate objects completes the package. 

There are two dovetail bar versions of the C11 available - a CG-5 style and a wider CGE style. Both models are identical optically and with what is included in each package.  

Specifications
OPTICAL TUBE INFO:
Optical Design Schmidt-Cassegrain
Aperture 279.4mm (11")
Focal Length 2800mm (110")
Focal Ratio f/10
Focal Length of Eyepiece 1 40mm (1.57")
Magnification of Eyepiece 1 70x
Finderscope 9x50
Star Diagonal 1.25" Star Diagonal
Optical Tube Aluminium
Highest Useful Magnification 660x
Lowest Useful Magnification 40x
Limiting Stellar Magnitude 14.7
Resolution (Rayleigh) 0.5 arc seconds
Resolution (Dawes) 0.42 arc seconds
Light Gathering Power (Compared to human eye) 1593x
Secondary Mirror Obstruction 95mm (3.75")
Secondary Mirror Obstruction by Diameter 34%
Secondary Mirror Obstruction by Area 12%
Optical Coatings StarBright XLT
Optical Tube Length 610mm (24")
Optical Tube Diameter 312.42mm (12.4")
Optical Tube Weight 27.5 lbs (12.4 kg)
Dovetail CG-5 Dovetail bar / CGE

 

Downloads

Schmidt-Cassegrain Manual