Celestron C8-A Schmidt-Cassegrain Optical Tube Assembly

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Item #CELE315-1

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  • $1,039.00
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  • 8-inch Schmidt-Cassegrain aluminum optical tube assembly
  • Long 80-inch focal length and 81X magnification
  • Features Celstron's premium StarBright XLT coatings
  • Accurately spot celestial objects with the 6x30 finderscope
  • Includes a 25mm eyepiece with 81x magnification
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  • Description

    • 8" Schmidt-Cassegrain Optical Tube Assembly
    • Aluminum Optical Tube
    • Celestron's premium StarBright XLT coatings
    • 2032 mm focal length (f/10)
    • 25 mm eyepiece included (81x)
    • Visual back allows for use with 1.25" accessories
    • 6x30 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 
    • APERTURE:  203.2 mm (8 in) 
    • FOCAL LENGTH:  2032 mm (80 in) 
    • FOCAL RATIO:  f/10
    • FINDERSCOPE:  6x30 
    • OPTICAL TUBE:  Aluminum 
    • EYEPIECE 1:  25 mm (0.98 in) 
    • MAGNIFICATION 1:  81 x 
    • STAR DIAGONAL:  1.25 
    • OPTICAL COATINGS:  StarBright XLT 
    • SECONDARY MIRROR OBSTRUCTION:  2.5 in (63.5 mm) 
    • OPTICAL TUBE LENGTH:  17 in (431.8 mm)
    • OPTICAL TUBE WEIGHT:  12.5 lb (5.67 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


    Shipping Restrictions

    Available for shipment to the USA and Canada only.

  • Dimensions & Specifications

    Model Type

    CGE Dovetail





    Eyepiece 1

    25mm (81x)



    Focal Length


    Focal Ratio


    Highest Useful Magnification



    17 inches

    Objective Lens Size Code


    Optical Design


    Recommended Usage


    Star Diagonal

    1.25 diagonal prism

    Telescopes Series

    Celestron Optical Tubes

    User Level

    For the Expert


    2-Year Limited


    12.5 lbs.


    StarBright XLT Optical Coating

  • 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.

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