Celestron EdgeHD 8" Optical Tube Assembly (CG5) - XLT

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Celestron EdgeHD 8" Optical Tube Assembly (CG5) - XLT
Item # CE-91031-XLT
3 Questions(s)

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  • The Celestron EdgeHD 8 OTA features premium XLT coatings.
  • Includes dovetail rail compatible with CG5 mount and 40 mm eyepiece.
  • The Celestron EdgeHD 8 OTA Aluminum Optical Tube has a 2032 mm focal length (f/10).
  • Visual back allows for use with 1.25" accessories and 9x50 finderscope to help accurately find objects.
  • Star diagonal included with the Celestron EdgeHD 8 OTA 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.
  • The Celestron EdgeHD 8 OTA 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.


Celestron EdgeHD 8" Optical Tube Assembly (CG5) - XLT

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.

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.

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. 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 optimized optical design, the EdgeHD 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 rotating the tube around the mount. 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 chip).

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 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 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 are opto-mechanically aligned on a laser bench to ensure they are axially symmetric in any configuration.

Celestron Product Number: 91031
Additional Information

Additional Information

SKU CE-91031-XLT
UPC Code 050234103190
Manufacturer Celestron
Telescope Series Celestron Optical Tubes
Optical Design Corrected Schmidt-Cassegrain
Mount Type None - Optical Tube Only
Warranty 2 Year Warranty
Telescope Aperture 8"
Telescope Focal Ratio f/10
Telescope Focal Length 2032mm
Limiting Stellar Magnitude 14
Highest Useful Magnification 480x
Optical Coatings Celestron XLT
Tube Color or Finish Celestron Oyster Pearl
Optical Tube Outer Diameter Not supplied by manufacturer
Length of Optical Tube 17"
Optical Tube Weight 14 lbs.
Mount Weight N/A
Dew Shield Included? No, Sold Separately
Diagonal Included? Yes - 1.25" Star Diagonal
Finder Included 9 x 50 Optical Finder
Eyepiece(s) Included 40mm
Power Adapter Included None - Does Not Require Power
CD ROMs Included None
Counterweights Included N/A
Alignment Procedure N/A
Tracking Modes N/A
Objects in Database N/A
OTA Mount Type CG-5 Dovetail
Tripod Type Included None, Sold Separately
Total Telescope Weight N/A
Included Items

Included Items

  • Celestron EdgeHD 8" Optical Tube Assembly (CG5) - XLT
  • Dovetail Rail
  • 40mm Eyepiece
  • Visual Back
  • 9X50 Finderscope
Questions & Answers

Product Questions

Is this dovetail rail compatible with Sky-watcher Az-EQ6 Goto? Or I'll need to buy a Losmandy DC8 - Dovetail Plate for 8" Celestron SCT's?
Hi, what else do i need to coople this OTA and a Zwo 178 mono camera in order to do planetary astrophotography?
HI! I can use this OTA with 2" diagonal? Or only with 1.25" Thank you!
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