Celestron C8 XLT / CGE OTA
  • Celestron C8 XLT / CGE OTA

Celestron C8 XLT CGE OTA

Celestron Schmidt-Cassegrain Optical Tube Assemblies (OTA) are available individually for use with your favorite mount

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General Features

  • 8" Schmidt-Cassegrain Optical Tube Assembly

  • Aluminum Optical Tube

  • Celestron's premium StarBright XLT coatings

  • 2032 mm focal length (f/10)

  • 25 mm eyepiece included (81x)

  • 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 CGE mount

Optical Design
Aperture (mm)
203.2 mm (8 in)
Focal Length
2032 mm (80 in)
Focal Ratio
Focal Length of Eyepiece 1 (mm)
25 mm (0.98 in)
Magnification of Eyepiece 1
81 x
Star Diagonal
Optical Tube
Highest Useful Magnification
480 x
Lowest Useful Magnification
29 x
Limiting Stellar Magnitude
Resolution (Rayleigh)
0.69 arc seconds
Resolution (Dawes)
0.57 arc seconds
Light Gathering Power (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 lbs (5.67 kg)
Dovetail Compatibility
CGE Mount

With any Cassegrain telescope you will have to consider the affect dew fall. The cheapest solution is a lens hood but when dew is a real problem then heater straps will evaporate dew off.


Data sheet

Optical Design
Schmidt Cassegrain
8 inch
Focal Length
2032 mm
Focal Ratio
Optical Coatings
Starbright XLT Coating
Optical Tube Length (mm)
17 inch

Specific References