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

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

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

B&H # CEC11AXLT MFR # 91036-XLT
Special Order
Expected availability: 2-4 weeks

Product Highlights

  • 11" Schmidt-Cassegrain OTA
  • 2800mm Focal Length, f/10 Focal Ratio
  • StarBright XLT Optical Coatings
  • 40mm Eyepiece, 90° Diagonal
  • 9x50 Finderscope
  • CGE (Losmandy) Dovetail Plate
  • OTA Only; Mount and Tripod Required
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This item is noncancelable and nonreturnable.

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You Pay: $2,449.00

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Celestron C11-A XLT overview

  • 1Description

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
In the Box
Celestron C11-A XLT 11" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGE Dovetail)
  • 40mm Eyepiece
  • 1.25" 90° Diagonal
  • SCT Visual Back
  • 9x50mm Finderscope
  • Universal Mounting Plate, CGE
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Celestron C11-A XLT specs

    Optical Design Schmidt-Cassegrain
    Aperture 279mm
    Focal Length 2800mm
    Focal Ratio f/10
    Eyepiece Barrel Diameter 1.25"
    Diagonal 90° star
    1.25" barrel
    Finderscope 9x50 mm
    Tripod None
    Mount Type CGE dovetail plate
    Power Source None
    Optical Tube Length 24.0" / 61.0 cm
    Weight 27.5 lbs / 12.5 kg
    Packaging Info
    Package Weight 42.0 lb
    Box Dimensions (LxWxH) 30.0 x 18.0 x 17.0"

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