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Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CG-5 Dovetail)
Celestron C11-A XLT (CG-5) Optical Tube Assembly

Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CG-5 Dovetail)

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Your Price: CAD3,428.26
Retail Price:CAD3,668.51

Your Savings:CAD240.25(7%)

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

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Power Supplies
Key Features
  • 11" Schmidt-Cassegrain OTA
  • 2800mm Focal Length, f/10 Focal Ratio
  • StarBright XLT Optical Coatings
  • 40mm Eyepiece, 90° Diagonal

Outfitted with an over-sized aperture, long effective focal length, and their proprietary StarBright XLT optical coatings, the Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope provides power and portability. The coating system consists of anti-reflection coatings on the corrector plate, highly reflective index mirror coatings, and low-absorption/high-transmission glass components to ensure that the maximum amount of light is gathered and transmitted to the user's eye. This system ensures bright and clear high-contrast images with accurate color rendition across the entire visual spectrum without visible distortion at the edges. Celestron includes a standard 1.25" visual back to accept eyepieces and accessories such as the 40mm eyepiece and 90° diagonal supplied with the optical tube assembly (OTA). This OTA is offered here without a mount or tripod for users who already have a support system—just ensure the mount's payload capacity exceeds 27.5 pounds to safely carry the weight and that the mount has a Vixen-style saddle to match the OTA's CG-5 mounting plate.

Optical Tube

  • 11" (279.4mm) aperture
  • f/10 focal ratio
  • 2800mm effective focal length
  • Schmidt-Cassegrain design optical path
  • StarBright XLT optical coatings
  • Resolution: 0.5 arcsec (Rayleigh); 0.42 arcsec (Dawes)
  • Secondary mirror obstruction: 3.75" (95 mm); 34% by diameter; 12% by area

StarBright XLT System

  • Maximizes light transmission through optical path
  • Improves color rendition, contrast, sharpness, resolution, and brightness
  • Broadband system provides flat wavelength transmission across the entire visual spectrum
  • Multi-layer mirror coatings with layers of aluminum, SiO2 (quartz), and TiO2 (titanium dioxide)
  • Multi-layer anti-reflective corrector plate coatings with layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide); hafnium has a wider band-pass than the commonly used titanium
  • High-transmission water white glass corrector plate limits light loss due to internal absorption

Mounting

  • Optical tube only—mount and tripod required for proper use
  • Supplied with CG-5 dovetail plate, which is compatible with Vixen-style saddles
  • Mount must have a payload capacity of over 27.5 pounds to safely support the OTA

Included Accessories

  • Visual back:
  • Standard threads for Schmidt-Cassegrain telescope optical tubes
  • 1.25" holder accepts 1.25" eyepieces and accessories
  • Eyepiece:
  • 1.25"-diameter barrel
  • Accepts most 1.25" astronomical filters
  • 40mm focal length produces 70x magnification
  • Diagonal:
  • 1.25"-diameter barrel
  • 90° angle places head in comfortable viewing position when scope is aimed at or near the zenith
  • Star diagonal corrects view horizontally, but not vertically
  • Finderscope:
  • 9x magnification
  • 50mm aperture
  • Mounting bracket included

Specifications

Optical DesignSchmidt-Cassegrain
Aperture279mm
Focal Length2800mm
Focal Ratiof/10
Eyepiece Barrel Diameter1.25"
Diagonal90° star
1.25" barrel
Finderscope9x50 mm
TripodNone
Mount TypeCG-5 dovetail plate
Power SourceNone
Optical Tube Length24.0" / 61.0 cm
Weight27.5 lbs / 12.5 kg
Packaging Info
Package Weight38.9 lb
Box Dimensions (LxWxH)28 x 20 x 18.5"


In the Box

  • Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CG-5 Dovetail)
  • 40mm Eyepiece
  • 1.25" 90° Diagonal
  • SCT Visual Back
  • 9x50mm Finderscope
  • Limited 2-Year Warranty


* The difference is about 2". The CGE uses a Losmandy "D" compatible dovetail (about 4" wide) and the CG5 uses a Vixen compatible plate (about 2" wide). 

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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