Celestron C9.25 Edge-HD

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Product description:

See the Universe in HD
EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces 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 all the way to the edge of the field of view.

True Astrograph Quality
Many optical designs that advertise themselves as "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the 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 competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today. 

Improved Performance
Superior edge performance not only creates rounder, more pleasing stars, but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. With Celestron’s StarBright XLT optical coatings on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.

Mechanical Features
In addition to EdgeHD’s optimized optical design, the telescope tube has been redesigned to make sure you get the most from your optics each and every night.

  • Mirror clutches - Flexible tension clutches hold the mirror in place and reduce image shift when taking long exposure astro-images. Once focused, the flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror assembly, keeping the image centered in the eyepiece (or on the sensor).
  • Tube vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 95-micron micromesh filter guaranteed to let warm air out without letting dust in.
  • Fastar versatility - EdgeHD is the most versatile imaging telescope available today. At its native f/10, you can achieve the image scale necessary to capture the smallest of deep sky objects. A Barlow gives you added power for high-resolution planetary, lunar and solar imaging. All EdgeHD optical tubes are Fastar-compatible, allowing the secondary mirror to be removed and replaced with a third party lens accessory for ultra-fast f/2 wide field imaging.

Individually Tested
Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.



Type Reflector
Type of build EdgeHD-Cassegrain
Aperture (mm) 235
Focal length (mm) 2350
Aperture ratio (f/) 10
Resolving capacity 0,49
Light gathering capacity 1127
Max. useful magnification 470
Tube weight (kg) 9,5
Tube length (mm) 559


Secondary mirror diameter (mm) 85
Secondary mirror obstruction 36
Ventilation for central mirror yes
Adjustable yes


Type of build SC thread
Connection ( to eyepiece) 2


GoTo control no
Mounting type no mount
Type of build OTA
Tracking no

Included accessories

2'' eyepieces Axiom LX 23mm
Finder scope 9x50
Deviating optics 2", 90° star diagonal
Eyepiece adaptor 1,25" & 2"
Prism rail Losmandy-Style


Series EdgeHD-Cassegrain
Special recommendation yes

Area of application

Nature Observation no
Moon & Planets yes
Nebulae & galaxies yes
Astrophotography yes (very good)
Sun no (Only with appropriate Sun filter)

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