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Celestron C11-A XLT (CG-5) Optical Tube Assembly
Celestron C11-A XLT (CG-5) Optical Tube Assembly

Celestron C11-A XLT (CG-5) Optical Tube Assembly

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Your Price: CAD3,169.00
Retail Price:CAD3,199.00

Your Savings:CAD30.00(1%)

Usually ships in 5-7 business days
Part Number:91067-XLT

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Key Technologies

StarBright XLT



Quick Overview

  • 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 CG-5 Advanced Series mount
Now you can have your own a la carte assemblage of your preferred optical tube and mount.  All Celestron Schmidt-Cassegrain telescopes utilize the multicoated Starbright® coatings group.  Highly reflective coatings are used on the mirrors, with anti-reflective coatings employed on the correcting lens for increases in light transmission.

Celestron's optical systems internal baffling ensures the highest contrast levels.  To maintain the company's mindset as well as to provide consistently high performance and customer satisfaction, all Celestron Schmidt-Cassegrain optical assemblies utilize the same superior optics regardless of their size or configuration.

The StarBright XLT coatings are all that distinguish this offering from the ordinary 11" optical tube assembly.  These coatings dramatically decrease the total percentage of light loss incurred by the scope's system of lenses & mirrors by a measure of 43%!  Light is invariably lost as it passes through lenses or is reflected from mirrors, and this can have a particularly dramatic effect of deep space objects.  StarBright XLT coatings are a highly intensive process which diminishes this effect and brings the faintest things your scope can resolve into greater detail.  They'll bring the details of bigger apertures without adding to the weight of your rig.

Limiting stellar magnitude of 14.7
Focus as close as 60' (18 m) for terrestrial viewing
Secondary mirror obstruction of 13.2%(by area)
Aluminum tube materials
 

Optical Design
Schmidt-Cassegrain
Aperture (mm)
279.4 mm (11 in)
Focal Length (mm)
2800 mm (110 in)
Focal Ratio
10
Eyepiece 1 (mm)
40 mm (1.57 in)
Magnification 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
CG-5 Mount

 
What's in the Box:
Celestron C11-A (XLT) 11.0"/279mm Aluminum Schmidt-Cassegrain Telescope Optical Tube Assembly 
  • 9x50mm Finderscope
  • 40mm (70xx) Plossl Eyepiece (1.25")
  • Star Diagonal and Visual Back
  • Dovetail Slide Bar
  • 2-Year Warranty

  • Based on Astronomy magazine’s telescope "report cards", scopes of this size and type generally perform as follows . . .


    Terrestrial Observation:No
    Lunar Observation:Very Good
    Planetary Observation:Very Good
    Binary and Star Cluster Observation:Very Good
    Galaxy and Nebula Observation:Very Good
    Photography:Yes
    Terrestrial Photography:No
    Lunar Photography:Yes
    Planetary Photography:Yes
    Star Cluster / Nebula / Galaxy Photography:Yes

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