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Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGEM Dovetail)

BH #CEC9.25AXLT • MFR #91027-XLT
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Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGEM Dovetail)
Key Features
  • 9.25" Schmidt-Cassegrain OTA
  • 2350mm focal length, f/10 Focal Ratio
  • StarBright XLT Optical Coatings
  • 25mm Eyepiece, 90° Diagonal
Outfitted with a large aperture, long effective focal length, and their proprietary StarBright XLT optical coatings, the Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope provides power and portability. The coating system consists of anti-reflection coatings on the corrector plate, highly reflective index mirror coatings, and low-absorption/high-transmission glass components to ensure that the maximum amount of light is gathered and transmitted to your eye. This system ensures bright and clear high-contrast images with accurate color rendition across the entire visual spectrum without visible distortion at the edges. Celestron includes a standard 1.25" visual back to accept eyepieces and accessories such as the 25mm eyepiece and 90° diagonal supplied with the optical tube assembly (OTA). This OTA is offered here without a mount or tripod for users who already have a support system. Just ensure the mount's payload capacity exceeds 20 pounds to safely carry the weight and that the mount has a Losmandy-style saddle to match the OTA's CGEM mounting plate.
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Celestron C9.25 Overview

Outfitted with a large aperture, long effective focal length, and their proprietary StarBright XLT optical coatings, the Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope provides power and portability. The coating system consists of anti-reflection coatings on the corrector plate, highly reflective index mirror coatings, and low-absorption/high-transmission glass components to ensure that the maximum amount of light is gathered and transmitted to your eye. This system ensures bright and clear high-contrast images with accurate color rendition across the entire visual spectrum without visible distortion at the edges. Celestron includes a standard 1.25" visual back to accept eyepieces and accessories such as the 25mm eyepiece and 90° diagonal supplied with the optical tube assembly (OTA). This OTA is offered here without a mount or tripod for users who already have a support system. Just ensure the mount's payload capacity exceeds 20 pounds to safely carry the weight and that the mount has a Losmandy-style saddle to match the OTA's CGEM mounting plate.

Optical Tube
  • 9.25" (235mm) aperture
  • f/10 focal ratio
  • 2350mm effective focal length
  • Schmidt-Cassegrain design optical path
  • StarBright XLT optical coatings
  • Resolution: 0.59 arcsec (Rayleigh); 0.49 arcsec (Dawes)
  • Secondary mirror obstruction: 3.35" (85mm); 36% by diameter; 13% by area
StarBright XLT System
  • Maximizes light transmission through the optical path
  • Improves color rendition, contrast, sharpness, resolution, and brightness
  • Broadband system provides flat wavelength transmission across the entire visual spectrum
  • Multi-layer mirror coatings with layers of aluminum, SiO2 (quartz), and TiO2 (titanium dioxide)
  • Multi-layer anti-reflective corrector plate coatings with layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide); hafnium has a wider band-pass than the commonly used titanium
  • High-transmission water white glass corrector plate limits light loss due to internal absorption
Mounting
  • Optical tube only; a mount and tripod are required for proper use
  • Comes with an attached CGEM dovetail plate, which is compatible with all Celestron and select third-party saddles; the plate can be unscrewed
  • Mount must have a payload capacity of over 20 lb to safely support the OTA
Included Accessories
Visual back:
  • Standard threads for Schmidt-Cassegrain telescope optical tubes
  • 1.25" eyepiece holder accepts 1.25" eyepieces and accessories

​Eyepiece:

  • 1.25" diameter barrel
  • Accepts most 1.25" astronomical filters
  • 25mm focal length produces 94x magnification

Diagonal:

  • 1.25" diameter barrel
  • 90° angle places the head in a comfortable viewing position when the scope is aimed at or near the zenith
  • Star diagonal corrects view horizontally, but not vertically

Finderscope:

  • 6x magnification
  • 30mm aperture
  • Mounting bracket included
UPC: 050234102797

Celestron C9.25 Specs

Optical Design
Schmidt-Cassegrain
Aperture
9.25" / 234.95 mm
Focal Length
2350mm
Focal Ratio
f/10
Eyepiece Barrel Diameter
1.25" / 31.7 mm
Diagonal
90° Star
1.25" / 31.7 mm Barrel
Finderscope
6x30 mm
Tripod
None
Mount Type
CGEM Dovetail Plate
Power Source
None
Optical Tube Length
22" / 55.9 cm
Weight
20 lb / 9.11 kg
Packaging Info
Package Weight
29.45 lb
Box Dimensions (LxWxH)
29 x 18 x 16"

Celestron C9.25 Reviews

See any errors on this page? Let us know

Can the Celestron C9 1/4-A XLT be upgraded to a 2 ...

Can the Celestron C9 1/4-A XLT be upgraded to a 2 inch focuser and 90 degree Eyepiece? If so what are the recommendations and part numbers? Thanks
Asked by: Frank
There are aftermarket 2" refractor-style focusers available that can be attached to the C9.25" OTA. You could also attach a 2" SCT 90 degree diagonal to the rear cell in order to use 2" eyepieces. Celestron item #93527
Answered by: Telescope
Date published: 2022-11-03

Does the Celestron Illuminated RACI Finder Scope ...

Does the Celestron Illuminated RACI Finder Scope fit on the 9.25 OTA?
Asked by: Jimmie
Yes, the Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGEM Dovetail) is compatible with the Celestron RACI finder scope: https://bit.ly/3HnwhMC
Answered by: Dan W
Date published: 2024-01-16

question

I see the mount handle obstructing the polar bore scope ? how do you polar align this with handle obstructing ?
Asked by: Guruprasad H.
The CGX and CGX-L mounts utilize the All Star Polar Alignment routine. It is substantially more accurate than a polar finder scope. However, if a customer insists on using a Polar Scope, we do offer one that is used off axis. But trust me, once you use All Star Polar Alignment - you will never want to use a polar scope again.
Answered by: Celestron Celestron Expert
Date published: 2022-01-11
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