Celestron CGE 800 Instruction Manual page 2
Schmidt-cassegrain optical tube assembly
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Also See for CGE 800:
- Instruction manual (75 pages) ,
- Communication protocol manual (8 pages) ,
- Supplementary manual (17 pages)
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A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused.
Some telescopes, known as refractors, use lenses. Other telescopes, known as reflectors, use mirrors. The Schmidt-Cassegrain
optical system (or Schmidt-Cass for short) uses a combination of mirrors and lenses and is referred to as a compound or
catadioptric telescope. This unique design offers large-diameter optics while maintaining very short tube lengths, making them
extremely portable. The Schmidt-Cassegrain system consists of a zero power corrector plate, a spherical primary mirror, and a
secondary mirror. Once light rays enter the optical system, they travel the length of the optical tube three times.
The optics of the Celestron Schmidt-Cassegrain telescopes have Starbright® coatings - enhanced multi-layer coatings on the
primary and secondary mirrors for increased reflectivity and a fully coated corrector for the finest anti-reflection characteristics.
8" OTA
Part Number
91024
Focal Length
2032mm F/10 2032mm F/10 2350mm F/10 2350mm F/10
Eyepiece
25mm –
1.25" (81x)
Star Diagonal 90° - 1.25"
Finderscope
6x30
Optical Tube
Aluminum
Fastar
No
Compatible
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The visual back is the accessory that allows you to attach all visual accessories to the telescope. The 8", 9.25" and
11" optical tubes come with the visual back installed. The 14" OTA comes with a thread on 2" star diagonal instead
of a visual back. If it is not already on the tube it can be attached as follows:
1. Remove the rubber cover on the rear cell.
2. Place the knurled slip ring on the visual back over the threads on the rear cell (Fig 1-2).
3. Hold the visual back with the set screw in a convenient position and rotate the knurled slip ring clockwise until tight.
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8" OTA-CF
9.25" OTA
91023
91027
25mm - 1.25"
25mm - 1.25"
(81x)
(94x)
90° - 1.25"
90° - 1.25"
6x30
6x30
Carbon Fiber
Aluminum
Yes
No
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Figure 1-1
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9.25" OTA-CF
91026
2800mm F/10 2800mm F/10 3910mm
25mm - 1.25"
40mm -
(94x)
1.25" (70x)
90° - 1.25"
90° - 1.25"
6x30
9x50
Carbon Fiber
Aluminum
No
No
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11" OTA
11" OTA-CF 14" OTA
91036
91035
40mm - 1.25"
(70x)
90° - 1.25"
9x50
Carbon Fiber
No
14" OTA
91037
91038-XLT
3910mm
F/11
F/11
40mm - 2"
40mm - 2"
(98x)
(98x)
90° - 2"
90° - 2"
9x50
9x50
Aluminum Aluminum
No
Yes
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