Celestron C9 1/4-A XLT (CG-5) Optical Tube Assembly
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General Features
- 9.25" Schmidt-Cassegrain Optical Tube Assembly
- Aluminum Optical Tube
- Celestron's premium StarBright XLT coatings
- 2350 mm focal length (f/10)
- 25 mm eyepiece included (94x)
- Visual back allows for use with 1.25" accessories
- 6x30 finderscope to help accurately find objects
- Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
- Includes dovetail rail compatible with CG-5 Advanced Series mount
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- 9.25" Schmidt-Cassegrain Optical Tube Assembly
- Aluminum Optical Tube
- Celestron's premium StarBright XLT coatings
- 2350 mm focal length (f/10)
- 25 mm eyepiece included (94x)
- Visual back allows for use with 1.25" accessories
- 6x30 finderscope to help accurately find objects
- Star diagonal provides more comfortable viewing position when observing objects that are high in the sky
- Includes dovetail rail compatible with CG-5 Advanced Series mount
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PUBLIC SPECS |
- Optical Design: Schmidt-Cassegrain
- Aperture (mm): 234.95 mm (9.25 in)
- Focal Length: 2350 mm (93 in)
- Focal Ratio: 10
- Focal Length of Eyepiece 1 (mm): 25 mm (0.98 in)
- Magnification of Eyepiece 1: 94 x
- Finderscope: 6x30
- Star Diagonal: 1.25
- Optical Tube: Aluminum
- Highest Useful Magnification: 555 x
- Lowest Useful Magnification: 34 x
- Limiting Stellar Magnitude: 14.4
- Resolution (Rayleigh): 0.59 arc seconds
- Resolution (Dawes): 0.49 arc seconds
- Light Gathering Power (Compared to human eye): 1127 x
- Secondary Mirror Obstruction: 3.35 in (85 mm)
- Secondary Mirror Obstruction by Diameter: 36%
- Secondary Mirror Obstruction by Area: 13%
- Optical Coatings: StarBright / XLT
- Optical Tube Length: 22 in (559 mm)
- Optical Tube Weight: 20 lbs (9.07 kg)
- Dovetail Compatibility: CG-5 Mount
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