Celestron EdgeHD 925 Telescope Optical Tube
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Celestron EdgeHD 925 Telescope Optical Tube

This update to the highly acclaimed Celestron C 925 designed to produce aberration-free images across a wide field of view.

  • 9.25 EdgeHD Optical Tube Assembly
  • Aluminum Optical Tube
  • Celestron's premium StarBright XLT coatings
  • 2350mm focal length (f/10)
  • 23mm Axiom 2 inch eyepiece included (102x)
  • 9x50 finderscope to help accurately find objects
  • 2" diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • Mirror Support Knobs hold the mirror in place and reduces image shift during imaging.
  • Tube vents with integrated 60 micron mesh filter allowing hot air to be released from behind the primary mirror.
  • Fastar Compatible optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging
  • Includes dovetail rail compatible with CGE mount

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.

True Astrograph Quality Many optical designs that advertise themselves as "astrograph" quality actually 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.

The EdgeHD optical system takes all of the compact power popularized by the Schmidt-Cassegrain Telescope (SCT) and combines it with an improved high definition optical system for wide field, astrograph quality images. As a visual instrument, EdgeHD optics deliver pinpoint images even with your widest field eyepiece. You can search for all of the Messier Catalog objects and see hundreds of other equally interesting NGC, IC and Caldwell objects with amazing clarity. For astroimaging, the EdgeHD optics produce aberration-free images across your favorite CCD or DSLR camera. All EdgeHD optics are designed to produce an extremely flat focal plane precise enough to match the strict tolerances of the largest commercial CCD detectors, allowing all stars to be in tight focus to the very edge of the chip.

EdgeHD Whitepaper

The Celestron Product Development team has released a whitepaper outlining the technology behind EdgeHD. This paper describes the development goals, design decisions, optical performance, and their practical realization in 8-, 9.25-, 11-, and 14-inch apertures. We include cross-sections of the EdgeHD series, comparative spot diagrams for the EdgeHD and competing "coma-free" Schmidt-Cassegrain designs, a table with specifications for visual and imaging, graphics showing how to place sensors at the optimum back-focus distance, and details on the construction and testing of the EdgeHD telescope series.

Celestron EdgeHD Optics Whitepaper
Click here to download the whitepaper.

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Our price: $1999.00

RRP: $2299.00 save 13%
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SKU91040-XLT
UPC 050234104098
Telescope Type Aplanatic Schmidt-Cassegrain
Aperture (in.) 9.25 inches
Aperture (mm) 235 mm
Focal Ratio f/10
Focal Length 2350 mm
Limiting Visual Magnitude 14.4
Eyepiece 1 23 mm
Magnification with Eyepiece 1 102x
Accepts 2-inch Eyepieces Yes
Adaptable for 2-inch Eyepieces Yes
Star Diagonal 2-inch mirror with 1.25-inch adapter
Finder 9 x 50 optical
Weight Fully Assembled 21 lbs.
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