Celestron C11-A Schmidt-Cassegrain OTA

Item #CELE350-1
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Price:$2,449.00

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  • 11-inch Schmidt-Cassegrain aluminum optical tube assembly
  • 2800mm focal length, 9x50 finderscope, and 70x magnification for a clear image
  • Light transmission enhanced with Celestron's premium StarBright XLT coating
  • Star diagonal and a dovetail rail compatible with CGE or CG-5 mount
  • One 40mm (1.57in) eyepiece included
  • Description

    • 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 CGE or CG-5 mount (select option) 

     

     

    • OPTICAL DESIGN:  Schmidt-Cassegrain
    • DOVETAIL COMPATIBILITY:  CG-5 Mount
    • APERTURE:  279.4 mm (11 in)
    • FOCAL LENGTH:  2800 mm (110.24 in)
    • FOCAL RATIO:  f/10.02
    • FINDERSCOPE:  9x50
    • OPTICAL TUBE:  Aluminum
    • EYEPIECE 1:  40 mm (1.57 in)
    • MAGNIFICATION 1:  70 x
    • STAR DIAGONAL:  1.25
    • OPTICAL COATINGS:  StarBright / XLT
    • SECONDARY MIRROR OBSTRUCTION:  3.75 in (95.25 mm)
    • SECONDARY MIRROR OBSTRUCTION BY AREA:  11.6 %
    • SECONDARY MIRROR OBSTRUCTION BY DIAMETER:  34.1 %
    • OPTICAL TUBE LENGTH:  24 in (609.6 mm)
    • OPTICAL TUBE WEIGHT:  27.5 lb (12.47 kg)

     

     

    About Celestron Schmidt-Cassegrain Telescopes

     

    Celestron’s excellent Schmidt-Cassegrain telescopes are compact and portable and represent the best all-purpose design for a wide variety of uses from terrestrial and deep sky viewing to astrophotography.


    Catadioptrics use a combination of mirrors and lenses to "fold" (reflect) the light path and form an image. In a Schmidt-Cassegrain, the light enters through a thin aspheric Schmidt correcting lens. It then strikes the spherical primary mirror. It is reflected back up the tube and intercepted by a small secondary mirror which reflects the light out an opening in the rear of the instrument where the image is formed at the eyepiece.


    Catadioptrics are the most popular and most modern type of telescope optical design and are marketed throughout the world in 3.5" and larger apertures. Catadioptric telescopes combine the practical advantages of lenses and mirrors while eliminating their disadvantages. They offer the clarity and contrast of refractors with the low aberration of reflectors. Catadioptrics have an average focal ratio of f/10, which is wide enough for all types of photography. They are also easier to maintain because all optical elements are solidly mounted and rigidly collimated. Catadioptric telescopes provide the best possible combination of light gathering power, long focal length, portability and affordability.

     

    Schmidt-Cassegrain Advantages

     

    • Very versatile, best all-purpose telescope design
    • Combines the optical advantages of both lenses and mirrors while eliminating their disadvantages
    • Excellent optics and razor sharp images over a wide field
    • Excellent for deep sky observing and astrophotography as well as terrestrial viewing
    • Very good for lunar, planetary and binary star observing
    • Focal ratio generally around f/10, it also has the best near focus capability of any type of telescope
    • Closed tube design reduces image-degrading air currents
    • Extremely compact and portable
    • Easy to use, durable and virtually maintenance free
    • Large apertures at reasonable cost and less expensive than equivalent aperture refractors
    • More accessories available than with other types of telescopes

     

    Schmidt-Cassegrain Disadvantages

     

    • More expensive than Newtonians of equal aperture
    • Slight light loss due to secondary mirror obstruction compared to refractors The Maksutov-Cassegrain is similar to the Schmidt-Cassegrain with essentially the same advantages and disadvantages. It uses a thick meniscus correcting lens with a strong curvature and a secondary mirror that is usually an aluminized spot on the corrector. The Maksutov secondary

    Supplier SKU

    91036-XLT

    Shipping Restrictions

    Available for shipment to the USA and Canada only.


    Dimensions & Specifications

    Model Type

    CGE Dovetail

    Aperture

    279mm

    Brand

    Celestron

    Focal Length

    2800mm

    Focal Ratio

    f/10

    Objective Lens Size Code

    279

    Optical Design

    Schmidt-Cassegrain

    Recommended Usage

    Astrophotography

    Telescopes Series

    Celestron Optical Tubes

    User Level

    For the Expert

    International Shipping

    Canada

  • Product Guarantee

    We stand behind all the products we sell, and your satisfaction is our top priority. If you're not satisfied with the quality of your purchase, simply send the item back to us in its original packaging within 30 days of its delivery.

    Manufacturer Warranty

    Celestron has a limited lifetime binocular and spotting scope warranty and all other products have a 2 year manufacturer's warranty covers against defects is provided. If you have specific questions about this product's warranty please contact Celestron's Customer Service department at 310-328-9560.

    Return & Exchange Policy

    At our site, returns are easy! You may return new, unused, and resalable items for a refund or exchange. Simply ensure that the item is returned in its original product packaging within 30 days of delivery.