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Appendix A – Technical Specifications
CGEM Series 11097 11098 11099
CGEM 800 CGEM 925 CGEM 1100
Specifications:
Optical Design
203mm (8") Schmidt-
Cassegrain
235mm (9.25") Schmidt-
Cassegrain
280mm (11") Schmidt-
Cassegrain
Focal Length
2032mm F/10 2350mm F/10 2800mm F/10
Finderscope
6x30 6x30 9x50
Mount
CGEM Computerized
Equatorial
CGEM Computerized
Equatorial
CGEM Computerized
Equatorial
Eyepiece
25mm Plossl (81x) 25mm Plossl (94x) 40mm Plossl (70x)
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
480x 555x 660x
Lowest Useful Magnification
29x 34x 40x
Limiting Stellar Magnitude
14 14.4 14.7
Resolution: Rayleigh
.68 arc seconds .59 arc seconds .50 arc seconds
Dawes Limit
.57 arc seconds .49 arc seconds .42 arc seconds
Light Gathering Power
843x unaided eye 1127x unaided eye 1593x unaided eye
Field of View: standard eyepiece
.64º .55º .61º
Linear FOV (@1000 yds)
33.6 ft. 29 ft. 32 ft.
Optical Coatings - Standard
Starbright XLT Coating Starbright XLT Coating Starbright XLT Coating
Secondary Mirror Obstruction
2.7" 3.35" 3.75"
by Area
11% 13% 12%
by Diameter
34% 36% 34%
Optical tube length
17 inches 22 inches 24 inches
Telescope Weight
88 lbs 113 lbs 120 lbs
CGEM Mount
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
5º/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
2-Star Align, 1-Star Align, Solar System Align, Quick Align, Last Align
Database
40,000+ objects, 400 user defined programmable 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