Celestron 9.25'' Edge HD Optical Tube
Celestron 9.25'' Edge HD Optical TubeCelestron 9.25'' Edge HD Optical TubeCelestron 9.25'' Edge HD Optical TubeCelestron 9.25'' Edge HD Optical Tube

Celestron 9.25" Edge HD Optical Tube

  (1 Review)
✓ 2 year warranty


1x in stock shipped 1-2 working days

About this product

Model:  celestron_edge_hd-2
Part Number:  91040-XLT-CGL

Celestron 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; it also provides an astrograph-quality flat focal plane to the edge of the field of view.


  • Visibly Sharper Images
  • Coma-free, flat-field optics
  • Enhanced Mechanical Features
  • Fastar® Compatible


True Astrograph Quality
Many optical designs that advertise themselves as "astrograph" quality only produce pinpoint stars across a curved focal plane. While this may be acceptable for visual observing, stars will appear out of focus at the edge when used with a flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt Cassegrain telescope and dramatically flatter than other competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.

Improved Performance
Superior edge performance creates rounder, more pleasing stars and improves the resolution and limiting magnitude compared to telescopes of equal aperture. Starbright XLT® Coatings coupled with Celestron's StarBright XLT coating group on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.

Mechanical Features
In addition to Celestron’s new optimised optical design, the EdgeHD tube has been redesigned to ensure you get the most from your optics every night.

Celestron Edge HD cutaway

Mirror Clutches - Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around the mount. The flexible rods allow the mirror to be held in place without force or pressure on the mirror assembly, keeping the image centred in the eyepiece (or chip).

Tube Vents - Cooling vents on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 60-micron micro-mesh filter guaranteed to let warm air out without letting dust in.

Fastar Versatility - The EdgeHD is the most versatile imaging scope available today. At its native f/10, you can achieve the image scale necessary to capture the smallest of deep sky objects. With the optional reducer lens (coming soon), you can increase your field of view without sacrificing optical performance. A Barlow gives you the added power for high-resolution planetary, lunar and solar imaging. And, of course, all EdgeHD optical tubes are Fastar® compatible for ultra-fast f/2 wide field imaging. Each tube has been fitted with a removable secondary mirror and is opto-mechanically aligned on a laser bench to ensure they are axially symmetric in any configuration.

All Celestron EDGE HD telescopes are fitted with the larger CGE (Losmandy-type) dovetail except for the 8-inch model, which can be supplied with a Vixen-type dovetail if requested. 





Optical Design: EdgeHD
Aperture: 234.95mm (9.25")
Focal Length: 2350mm (93")
Focal Ratio: f/10
Focal Length of Eyepiece 1: 23mm (0.91")
Magnification of Eyepiece 1: 102x
Finderscope: 9x50
Star Diagonal: 2" with 1.25" adapter
Optical Tube: Aluminum
Highest Useful Magnification: 555x
Lowest Useful Magnification: 34x
Limiting Stellar Magnitude: 14.4
Resolution (Rayleigh): 0.59 arc seconds
Resolution (Dawes): 0.49 arc seconds
Light Gathering Power (Compared to the human eye): 1127x
Secondary Mirror Obstruction: 85mm (3.35")
Secondary Mirror Obstruction by Diameter: 36%
Secondary Mirror Obstruction by Area: 13%
Optical Coatings: StarBright XLT
Optical Tube Length: 559mm (22")
Optical Tube Diameter: 271.78mm (10.7")
Optical Tube Weight: 21 lbs (9.53 kg)
Dovetail: CGE Dovetail Bar
Solar Warning
  • Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.
  • Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
  • Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.


Customer reviews

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11 January 2022  | 

Great service from FLo, as these scopes have been quite scarce over the last 2 years, when I saw FLo had one in stock, and at a great price, getting on for 500 cheaper than other UK stockists, though it has now had a price increase of near 300 at FLo since I received mine, I felt I had to strike while I could, I ordered it on New Years Eve 31/12/2021 and it arrived by 10.00am on Wednesday 5th January 2022, given that this was over the new year holiday and the 3rd & 4th were substitute bank holidays I think this was fantastic speed of service, not had a chance to use it to date, Celestron accessories being very difficult to source, and the weather being very dull and overcast, but looking forward to clear skies soon.


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