Appendix a - technical specifications – Celestron NexStar 80GTL User Manual
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APPENDIX A - TECHNICAL SPECIFICATIONS
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NexStar 80GTL
Design Refractor
Aperture 80mm
Focal Length
900mm
F/ratio of the Optical System
F/11
Objective Coatings
Fully Coated
Highest Useful Magnification
189x
Lowest Useful Magnification
11x
Resolution: Rayleigh Criterion
Dawes Limit
1.73 arc seconds
1.45 arc seconds
Light Gathering Power
131x unaided eye
Field of View: Standard Eyepiece
1.4º
Linear Field of View (at 1000 yds)
74 feet
Eyepiece Magnification:
36x (25mm)
90x (10mm)
Optical Tube Length
35 inches
Electronic Specifications
Input Voltage
Maximum
Minimum
12 V DC Nominal
18 V DC Max.
8 V DC Min.
Batteries Required
8 AA Alkaline
Power Supply Requirements
12 VDC-750 mA (Tip positive)
Mechanical Specifications
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 Display
19 fiber optic backlit LED buttons
Fork Arm
Cast aluminum
Software Specifications
Software Precision
16 bit, 20 arc sec. calculations
Ports
RS-232 communication port on hand control
Tracking Rates
Sidereal, Solar and Lunar
Tracking Modes
Alt-Az, EQ North & EQ South
Alignment Procedures
AutoAlign, 2-Star Alignment, Quick-Align
Database
25 user defined programmable object.
Enhanced information on over 100 objects
Total Object Database
4,033 Objects