Celestron C8-A AVX / CG5 Optical Tube (XLT)

The 8 "(203mm) optical tube is made of high quality aluminum, incorporates starbright XLT coatings for greater light transmission. Compatible with AVX / CG5 (Dovetail) mount, as it includes the dovetail rail Compatible with this mount The diagonal star provides a more comfortable viewing position when viewing objects in the sky.

Characteristics:

• Optical design: Schmidt-Cassegrain
  
• Opening (mm): 203.2 mm (8 inches)
  
• Focal length: 2032 mm (80 in)
  
• 10 Focal Ratio
  
• 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: 29 x
  
• 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 (432 mm)
  
• Optical Tube Weight: 12.5 pounds (5.67 kg)
  
• Dovetail Compatibility: CG-5 Mount