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
Key Features
- 9.25" Schmidt-Cassegrain OTA
- 2350mm focal length, f/10 Focal Ratio
- StarBright XLT Optical Coatings
- 25mm Eyepiece, 90° Diagonal
- 6x30 Finderscope
- CGEM Dovetail Plate
- OTA Only; Mount and Tripod Required
- Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGEM Dovetail)
- 25mm Eyepiece
- 1.25" 90° Diagonal
- SCT Visual Back
- 6x30mm Finderscope
- Limited 2-Year Manufacturer Warranty
Key Specs
| Optical Design | Schmidt-Cassegrain |
| Aperture | 9.25" / 234.95 mm |
| Focal Length | 2350 mm |
| 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 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGEM Dovetail)
- Product Code: CEC9.25AXLT
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
Key Features
- 9.25" Schmidt-Cassegrain OTA
- 2350mm focal length, f/10 Focal Ratio
- StarBright XLT Optical Coatings
- 25mm Eyepiece, 90° Diagonal
- 6x30 Finderscope
- CGEM Dovetail Plate
- OTA Only; Mount and Tripod Required
- Celestron C9 1/4-A XLT 9.25" f/10 Schmidt-Cassegrain Telescope (OTA Only, CGEM Dovetail)
- 25mm Eyepiece
- 1.25" 90° Diagonal
- SCT Visual Back
- 6x30mm Finderscope
- Limited 2-Year Manufacturer Warranty
Key Specs
| Optical Design | Schmidt-Cassegrain |
| Aperture | 9.25" / 234.95 mm |
| Focal Length | 2350 mm |
| 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" |
- Brand: Celestron
- Product Code: CEC9.25AXLT
- Availability: In Stock
$1,099.00
Tags:CelestronC9.25 XLTSchmidt-Cassegrain TelescopeSCT TelescopeOptical Tube AssemblyCGEM DovetailAstronomy TelescopeAstrophotography Telescope9.25 Inch TelescopeComputerized Telescope
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