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Appendix A - Technical Specifications
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Schmidt Cassegrain Optical Design
Design
Aperture 5 inches (125mm)
Focal Length 50 inches (1250mm)
F/ratio of the Optical System 10
Primary Mirror: Diameter
125mm
Coatings Starbright XLT®
Secondary Mirror Spot Size
Secondary Obstruction
1.75"
35% by diameter; 12% by area
Corrector Plate: Material
Optical Quality Crown Glass
Coatings Starbright XLT®
Highest Useful Magnification 300x
Lowest Useful Magnification (7mm exit pupil) 18x
Resolution: Rayleigh Criterion
Dawes Limit
1.11 arc seconds
.91 arc seconds
Light Gathering Power 329x unaided eye
Near Focus standard eyepiece or camera ~ 20 feet
Field of View: Standard Eyepiece
: 35mm Camera
1º
1.6º x 1.1º
Linear Field of View (at 1000 yds) 52.5 feet
Magnification: Standard Eyepiece 50x
Optical Tube Length 11 inches
Weight of Telescope 17.6 Lbs.
Weight of Tripod 10 lbs
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Input Voltage
12 V DC Nominal
Batteries Required 8 AA Alkaline
Power Supply Requirements 12 VDC-750 mA (Tip positive)
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Motor: Type
Resolution
DC Servo motors with encoders, both axes
.26 arc sec
Slew speeds Nine slew speeds: 4º /sec, 2º /sec, 1º/sec, .5/sec, 32x, 16x, 8x, 4x, 2x
Hand Control Double line, 16 character Liquid Crystal Dis
play
19 fiber optic backlit LED buttons
Fork Arm Cast aluminum, with integrated hand control receptacle
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Software Precision 16 bit, 20 arc sec. calculations
Ports RS-232 communication port on hand control
Tracking Rates Sidereal, Solar, Lunar and King
Tracking Modes Alt-Az, EQ North & EQ South
Alignment Procedures SkyAlign, Auto Two-Star, Two-Star, One-Star, Solar System Align
Database 200 user defined programmable object.
Enhanced information on over 200 objects
Total Object Database 38,181
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