

Celestron Schmidt-Cassegrain Optical Tube Assemblies (OTA) are available individually for use with your favorite mount. Each OTA is made to the same exacting standards as those used on all our high quality telescopes.
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
|
Schmidt-Cassegrain |
---|---|
Aperture (mm)
|
203.2 mm (8 in) |
Focal Length
|
2032 mm (80 in) |
Focal Ratio
|
10 |
Focal Length of Eyepiece 1 (mm)
|
25 mm (0.98 in) |
Magnification of Eyepiece 1
|
81 x |
Finderscope
|
6x30 |
Star Diagonal
|
1.25 |
Optical Tube
|
Aluminum |
Highest Useful Magnification
|
480 x |
Lowest Useful Magnification
|
29 x |
Limiting Stellar Magnitude
|
14 |
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.
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Celestron Schmidt-Cassegrain Optical Tube Assemblies (OTA) are available individually for use with your favorite mount. Each OTA is made to the same exacting standards as those used on all our high quality telescopes.