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Celestron - EdgeHD 925 9.25" Optical Tube Assembly (OTA)

Model#: 91040-XLT

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Manufactured by: Celestron


The Celestron EdgeHD 925 is a catadioptric based optical tube assembly with the EdgeHD optical system to reduce coma. This makes it outstanding for both visual astronomy and astrophotography and is capable of imaging a wide variety of celestial objects ranging from planets to distant galaxy clusters. With the addition of the StarBright XLT coatings by Celestron, excellent and efficient light transmission can be obtained. Since most Schmidt-Cassegrain designs normally have a default focal ratio of f/10 and can be reduced by using the Fastar system of removable secondary mirrors to create a fast focal ratio of f/2 for wide field and fast astrophotography with most deep sky objects. This is a step up from the regular Schmidt-Cassegrain design!

  • Catadioptric system
  • EdgeHD optical system to reduce coma on edges of field of view
  • 2500mm focal length
  • 9.25" aperture
  • StarBright XLT Coatings
  • 9x50 Finderscope
  • 23mm Luminos Eyepiece - 2"
  • 2" Star Diagonal
  • 1.25" Visual Back
  • Dovetail slide bar for mounting the CGE mount
  • Fastar compatible to transform f/10 to f/2










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.



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Additional Information

Name Celestron - EdgeHD 925 9.25" Optical Tube Assembly (OTA)
Manufacturer Celestron
Model 91040-XLT
Aperture 234.95 mm (9.25 in)
Dovetail Compatibility CGE Mount
Eyepiece 1 23 mm (0.91 in)
Eyepiece Focal Length 23 mm (0.91 in)
Eyepiece 1 Magnification 102 x
Finderscope 9x50
Focal Length 2350 mm (92.52 in)
Focal Ratio 10
Highest Useful Magnification 555 x
Light Gathering Power 1127 x
Lowest Useful Magnification 34 x
Magnification 1 102 x
Optical Coatings StarBright XLT
Optical Design EdgeHD
Optical Tube Aluminum
Optical Tube Length 22 in (558.8 mm)
Optical Tube Weight 21 lbs (9.53 kg)
Resolution (Dawes) 0.49 arc seconds
Resolution (Rayleigh) 0.59 arc seconds
Secondary Mirror Obstruction 3.35 in (85.09 mm)
Secondary Mirror Obstruction by Area 13.1 %
Secondary Mirror Obstruction by Diameter 36.2 %
Star Diagonal 2" w/ 1.25" adapter