Celestron C8-A (XLT) Optical Tube

The 8 "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): 203.2 mm (8 inches)
  
• Focal length: 2032 mm (80 in)
  
• Focal Ratio: 10
  
• Eyepiece 1 focal length (mm): 25 mm (0.98 in)
  
• Eyepiece magnification 1: 81 x
  
• finder telescope: 6x30
  
• Diagonal Star 1,25
  
• Aluminum Optical Tube
  
• Maximum useful magnification of: 480 x
  
• Minimum useful magnification: 29x
  
• Stellar Limit Magnitude: 14
  
• Resolution (Rayleigh): 0.69 arcseconds
  
• Resolution (Dawes): 0.57 arcseconds
  
• Light Energy Encounter (compared to human eye): 843 x
  
• Secondary Mirror Obstruction: 2.5 in (64 mm)
  
• Secondary Mirror obstruction by Diameter: 31%
  
• Secondary Mirror obstruction by Area: 9.77%
  
• Optical Coatings: StarBright XLT
  
• Optical Tube Length: 17 "in (432mm)
  
• Optical Tube Weight: 12.5 lbs (5.67 kg)
  
• Dovetail Compatibility: CGE Mount