Celestron C8-S User Manual
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Appendix A – Technical Specifications
Advanced Series
11071/11072
11025/11026
11045/11046
C5-S
C8-S
C9.25-S
Specifications:
Optical Design
127mm(5") Schmidt-Cassegrain 203mm (8") Schmidt-Cassegrain 235mm (9.25") Schmidt-Cassegrain
Focal Length
1250mm F/10
2032mm F/10
2350mm F/10
Finderscope
6x30 6x30 6x30
Mount
CG-5 Equatorial
CG-5 Equatorial
CG-5 Equatorial
Eyepiece
25mm Plossl (50x)
25mm Plossl (81x)
25mm Plossl (94x)
Star Diagonal
1.25" 1.25" 1.25"
Accessory tray
Yes Yes Yes
Tripod
2" Stainless Steel
2" Stainless Steel
2" Stainless Steel
Technical Specs
Highest Useful Magnication
300x 480x 555x
Lowest Useful Magnification
18x 29x 34x
Limiting Stellar Magnitude
13 14 14.4
Resolution: Rayleigh
1.1arc seconds
.68 arc seconds
.59 arc seconds
Dawes Limit
.91 arc seconds
.57 arc seconds
.49 arc seconds
Photographic Resolution
200 line/mm
200 line/mm
200 line/mm
Light Gathering Power
329x unaided eye
843x unaided eye
1127x unaided eye
Field of View: standard eyepiece
1º .64º .55º
Linear FOV (@1000 yds)
52.5 ft.
33.6 ft.
29 ft.
Optical Coatings - Standard
Starbright Coating
Starbright Coating
Starbright Coating
Secondary Mirror Obstruction
1.75" 2.7" 3.35"
by Area
12% 11% 13%
by Diameter
35% 34% 36%
Optical tube length
14 inches
17 inches
22 inches
Telescope Weight
48 lbs
54.5 lbs
73 lbs
Advanced GT
Additional Specifications
Hand Control
Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons
Motor: Type
DC Servo motors with encoders, both axes
Max Slew Speed
3º/second
Software Precision
24bit, 0.08 arcsec calculation
Hand Control Ports
RS-232 communication port on hand control
Motor Ports
Aux Port, Autoguide Ports
Tracking Rates
Sidereal, Solar and Lunar
Tracking Modes
EQ North & EQ South
Alignment Procedures
AutoAlign, 3-Star Alignment, Quick Align, Last Align
Database
40,000+ objects, 400 user defined programmable objects.
Enhanced information on over 200 objects
Enhanced information on over 200 objects
Complete Revised NGC Catalog
7,840
Complete Messier Catalog
110
Complete IC Catalog
5,386
Complete Caldwell
109
Abell Galaxies
2,712
Solar System objects
9
Famous Asterisms
20
Selected CCD Imaging Objects
25
Selected SAO Stars
29,500
Total Object Database
45,492