Celestron - EdgeHD 800 OTA - 8" EdgeHD Optical Tube Assembly for CGE/CGX - 91030-XLT

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    Experience premium optical performance with Celestron's EdgeHD aplanatic, flat field Schmidt-Cassegrain optics for pinpoint stars across the entire field of view. This 8" optical tube assembly is perfect for ultra-wide eyepieces and larger image sensors.

    Aluminum optical tube with tube vents featuring an integrated 95-micron mesh filter allows hot air to be released from behind the primary mirror. Mirror support knobs hold the mirror in place and reduce image shift during imaging.

    The versatile design of the Celestron Edge HD 800 accommodates 3 focal ratios: native f/10, f/7 with the addition of a focal reducer, or ultra-fast f/2 imaging with a removable secondary mirror and third-party accessories.

    Celestron’s premium StarBright XLT coatings provide maximum light transmission.

    A 9x50 finderscope, 1.25” mirror diagonal for more comfortable viewing, and 40 mm Plössl 1.25” eyepiece are all included.
SKU: CEL-91030-XLT
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Product Description

CELESTRON  -  EdgeHD 800 8"  SCT Optical Tube Assembly (OTA)

The Celestron Edge HD 800 takes the Schmidt-Cassegrain (SCT) system and minimizes the coma at the edge of the field of view, making the optics  suitable for very professional high-end astrophotography. When coma occurs, stars at the edge of the field of view don't appear as razor sharp as those in the center. The EdgeHD optical tube assembly ensures that high definition pinpointed images are not only in the center, but at the very edges as well. Aplanatic Schmidt-Cassegrain optical system. This compound, or catadioptric, light-path employs a combination of mirrors and lenses that offer a large, high-resolution aperture, a shorter tube length, and enhanced portability. Since this is a catadioptric design, therefore using mirrors and corrective plates, taking aspects from both reflectors and refractors, telescopes like the Celestron Edge HD 800 naturally result in having a slower focal ratio of f/10, which is excellent for viewing or imaging planets or any other objects with high surface brightnesses at smaller fields of view. Celestron's built in Fastar system uses a removable secondary mirror to transform the optical tube into a f/2 focal ratio which is outstanding for deep sky observing! With a fast focal ratio, this 8" optical tube assembly can accommodate very large CCD chips because it allows for bigger pixel size without as much chance of blooming and allows much shorter exposure times.


  • Coma eliminated with EdgeHD optics
  • StarBright XLT Coatings
  • 8" Aperture
  • Focal ratio of f/10
  • Fastar focal ratio of f/2
  • 9x50 finderscope
  • 1.25" diagonal
  • 40mm eyepiece
  • 1.25" visual back
  • Dovetail slide bar for CGE








Name Celestron - EdgeHD 800 OTA - 8" EdgeHD Optical Tube Assembly for CGE/CGX - 91030-XLT
Manufacturer Celestron
Model CEL-91030-XLT
UPC 050234103091
In The Box Celestron 8" EdgeHD Optical Tube
Aperture 203.2 mm (8 in)
Dovetail Compatibility CGE Mount
Eyepiece 1 40 mm (1.57 in)
Finderscope 9x50
Focal Length 2032 mm (80 in)
Focal Ratio f/10
Optical Tube Aluminum
Optical Tube Length 17 in (431.8 mm)
Optical Tube Weight 14 lbs (6.35 kg)
Secondary Mirror Obstruction 2.7 in (68.58 mm)
Secondary Mirror Obstruction by Area 11.4 %
Secondary Mirror Obstruction by Diameter 33.8 %
Star Diagonal 1.25


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In the Box

Celestron 8" EdgeHD Optical Tube

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