Celestron C11-A Optical Tube (XLT)

The 11 "optical tube is made of high quality aluminum, incorporates starbright XLT coatings for greater light transmission. Compatible with CGE (Dovetail) mount, as it includes the CGE mount compatible dovetail rail. Diagonal star provides a more comfortable viewing position when observing objects that are in the sky.
Characteristics:

• Optical design: Schmidt-Cassegrain
  
• Opening (mm): 279.4 mm (11 inches)
  
• Focal length: 2800 mm (110 inches)
  
• 10 Focal Ratio
  
• Eyepiece 1 focal length (mm): 40 mm (1.57 in)
  
• Eyepiece magnification 1: 70 x
  
• finder telescope: 9x50
  
• Diagonal Star: 1,25
  
• Aluminum Optical Tube
  
• Maximum usable magnification of 660 x
  
• Minimum useful magnification of 40 x
  
• Stellar Limit Magnitude: 14.7
  
• Resolution (Rayleigh) of 0.5 arc seconds
  
• Resolution (Dawes) 0.42 arcseconds
  
• Light Energy Encounter (compared to human eye): 1593 x
  
• Secondary Obstruction Mirror: 3.75 in (95mm)
  
• Secondary Mirror obstruction by Diameter: 34%
  
• Secondary Mirror obstruction by Area: 12%
  
• Optical Coatings: StarBright / XLT
  
• Optical 24-inch (610 mm) tube length
  
• Optical Tube Weight: 27.5 pounds (12 kg)
  
• Compatibility: CGE Mount