Celestron 9.25" SCT optical tube, CG5/AVX dovetail


Availability: In stock

This 9.25" SCT optical tube has advanced Starbright XLT multicoatings for Celestron's brightest images ever. It mounts directly on a Celestron CG-5, Advanced Series Go-To, or Celestron/Vixen Great Polaris German equatorial mount . . .
Our Product #: C9OTA5X
Celestron Product #: 91025-XLT
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Product Description

This 9.25" aperture Celestron C9 1/4-A XLT optical tube gathers 33% more light than an 8" scope, providing brighter images of faint deep space objects. Its light-gathering ability is over 1125 times that of even the sharpest dark-adapted eye. The optical design uses a longer focal length primary mirror and lower magnification secondary mirror than a conventional SCT. This yields a flatter field of view at the focal plane. It also reduces optical aberrations during photography and when using wide field long focal length 2" eyepieces. An optimized baffle system further improves astrophotography by minimizing vignetting at the corners of a 35mm negative or large format CCD.

Advanced Starbright XLT multicoatings are standard equipment. This coatings package includes high reflectivity multilayer aluminum mirrors enhanced with titanium dioxide for high reflectivity, plus a unique combination of magnesium fluoride and hafnium dioxide antireflection coatings on both sides of the Schmidt corrector lens. The corrector lens itself is made of high transmission water white float glass instead of conventional soda lime glass (which has 3.5% lower transmission) used in other telescopes.

Starbright XLT multicoatings visibly increase the contrast on subtle lunar, planetary, and nebula details when compared with a scope with standard multicoatings. They also give you higher light transmission for brighter deep space images and shorter exposure times during CCD and 35mm photography. Across the total visual/photographic spectrum from 400nm to 750nm, independent laboratory tests show the new Starbright XLT coatings are 16% brighter overall than even the original industry-standard Starbright multicoatings.

The rugged aluminum optical tube is only 22" long and weighs only 20 lbs., making it easy to transport and set up. An optional focal reducer (#8325) is available to bring the focal ratio down to a fast f/6.3 for CCD and 35mm photography.

A review of Celestron 9.25" optics in Astronomy magazine said the optics were "a real winner . . . (Jupiter's) belts were simply dazzling, with subtle colors and the most tenuous detail seen steadily . . . (Saturn's) rings were very impressive, and both Cassini's Division and the C ring were easily visible . . . Deep sky objects were no less appealing . . . the Orion Nebula was wonderful, showing its gossamer clouds in all sorts of intricate contortions. Buried within the clouds, all four stars of the Trapezium sparkled, and even the more challenging E and F Trapezium members shown through . . . The telescope delivered consistently good images of these celestial gems - a sign of superb optical quality."

The optical tube comes with a 6 x 30mm straight-through achromatic finderscope and mounting bracket. The finder has a wide 7° field of view. It focuses by loosening the trim ring behind the objective lens cell, screwing the lens cell in or out to focus, and tightening the trim ring to lock in the correct focus. Also included is a removable 1.25" visual back that holds visual and photographic accessories such as a star diagonal, tele-extender, etc. A 1.25" prism type star diagonal is also standard, as is a 1.25" 25mm Plössl eyepiece. This eyepiece provides a magnification of 94x, with a 0.51° field that's slightly larger than the full Moon.

A 1.75" wide dovetail slide bar runs the length of the tube for mounting the optical tube on a Celestron CG-5, Advanced Series Go-To, or Celestron/Vixen Great Polaris German equatorial mount. Optional split mounting rings are also available to put the tube on another mount of the buyer's choosing. Dust covers for the optics complete the supplied accessories.

Tech Details

Aperture 9.25"
Focal Length 2350mm
Focal Ratio f/10
Heaviest Single Component 20 lbs.
Highest Useful Magnification 470x
Weight 20 lbs.
Optical Coatings StarBright XLT
Resolution 0.49 arc seconds
Supplied Eyepiece 25mm 1.25"
Telescope Type Schmidt-Cassegrain
View Finder 6x30
Visual Limiting Magnitude 14.4
Warranty 2 years


Review by:
I bought an Celestron 9.25" SCT and I am very happy with my purchase. Very nice optics for planetary and deep sky. Fastar ability for fast wide field imaging. (Posted on 7/22/2019)
Review by:
I have owned a number of cassegrains, but the 9.25 is my favorite. Light and powerful, its arguably the best cassegrain made. Amazing for observing or imaging. Fastar compatible for use with Hyperstar as an astrograph. Jupiter, saturn, the moon, all stunning. You will not be dissapointed with this scope. I've imaged many DSOs thru this scope with great results and for solar system imaging its second to none. You'll be hard pressed to find a single negative review on the net regarding this scope, even when compared with a c11. When you own one... you keep it... A legendary scope. (Posted on 11/25/2018)
Review by:
I have the Torrance mfd. version of this OTA, and, having owned their 8", 11" and 14" models, I think this one offers the best compromise as far as weight/aperture is concerned. I use mine on a Losmandy GM-8 mount and it is my planetary observing rig (with Denkmeier bino-viewer). I still have my 8" but did sell on the 11" and 14" as too unwieldy. When seeing cooperates it leaves nothing else to be desired. Recommended. (Posted on 11/6/2018)
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