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

BH #CEC11AXLT • MFR #91036-XLT
Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)
Key Features
  • 11" Schmidt-Cassegrain OTA
  • 2800mm Focal Length, f/10 Focal Ratio
  • StarBright XLT Optical Coatings
  • 40mm Eyepiece, 90° Diagonal
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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 Losmandy-style saddle to match the OTA's CGE mounting plate.
Special Order
Expected availability: 2-4 weeks
$2,389.00
$200/mo. suggested payments
with 12 Mos. Promo Financing* 

Important Notice

  • This item is noncancelable and nonreturnable.

Celestron C11-A XLT Overview

  • 1Description
  • 2Optical Tube
  • 3StarBright XLT System
  • 4Mounting
  • 5Included Accessories

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 Losmandy-style saddle to match the OTA's CGE 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 CGE dovetail plate, which is compatible with Losmandy-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
UPC: 050234103695

Celestron C11-A XLT Specs

Optical DesignSchmidt-Cassegrain
Aperture279mm
Focal Length2800mm
Focal Ratiof/10
Eyepiece Barrel Diameter1.25"
Diagonal90° star
1.25" barrel
Finderscope9x50 mm
TripodNone
Mount TypeCGE dovetail plate
Power SourceNone
Optical Tube Length24.0" / 61.0 cm
Weight27.5 lbs / 12.5 kg
Packaging Info
Package Weight42 lb
Box Dimensions (LxWxH)30 x 18 x 17"
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