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Celestron - EdgeHD 800 8" Optical Tube Assembly (OTA)


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Availability: Available - Ships in 2-4 Days


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Manufactured by: Celestron


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

Celestron's EdgeHD optics 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 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 EdgeHD 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 like this, the EdgeHD 800 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







Product Series

SEE THE UNIVERSE IN HD Introducing Celestron's New Aplanatic Schmidt Telescope Design! visibly Sharper images Superior performance. Enhanced Mechanical features fastar Compatible

EdgeHD is an aplanatic Schmidt telescope designed to produce aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma, but also to give an astrograph quality flat focal plane all the way to the edge of the field of view.



Additional Information

Name Celestron - EdgeHD 800 8" Optical Tube Assembly (OTA)
Manufacturer Celestron
Model CEL-91030-XLT
Manufacturer Part No CEL-91030-XLT
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 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