Celestron C11 Optical Tube Assembly – 11"

The Celestron C11 Optical Tube Assembly (CGE Dovetail) is a professional-grade Schmidt-Cassegrain telescope offering an impressive 279 mm (11") aperture and 2800 mm focal length. Compact yet powerful, it weighs just 27.5 lbs (12.4 kg) and measures 24 inches in length, making it portable for one-person setup.

Equipped with StarBright® XLT optical coatings, it delivers brighter images, superior contrast, and shorter exposure times for astrophotography. With support for Fastar technology, the secondary mirror can be replaced with a lens assembly for ultra-fast f/2 imaging—perfect for capturing galaxies and nebulae in seconds.

Ideal for advanced observers and astrophotographers, the C11-A combines premium optics with versatility, making it an excellent choice for both deep-sky and planetary imaging.

• Optical Design: Schmidt-Cassegrain
• Aperture: 279.4 mm (11")
• Focal Length: 2800 mm
• Focal Ratio: f/10
• Eyepiece Included: 40 mm (70x magnification)
• Finderscope: 9x50
• Star Diagonal: 1.25"
• Highest Useful Magnification: 660x
• Lowest Useful Magnification: 40x
• Limiting Stellar Magnitude: 14.7
• Resolution (Rayleigh): 0.5 arcsec
• Resolution (Dawes): 0.42 arcsec
• Light Gathering Power: 1593x human eye
• Secondary Mirror Obstruction: 95 mm (34%)
• Optical Coatings: StarBright XLT
• Tube Material: Aluminum
• Tube Length: 610 mm (24")
• Tube Diameter: 312 mm (12.4")
• Tube Weight: 27.5 lbs (12.4 kg)
• Dovetail: CGE-style

• Celestron C11 Optical Tube Assembly (CGE Dovetail)
• 40 mm Eyepiece
• 1.25" Star Diagonal
• 9x50 Finderscope
• CGE Dovetail Mounting Bar
• Documentation & Accessories