APPENDIX A – TECHNICAL SPECIFICATIONS
Optical Specification |
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| NexStar 8i |
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Design |
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Aperture |
| 8 inches (203.2mm) |
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Focal Length |
| 80 inches (2032mm) |
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F/ratio of the Optical System | 10 |
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Primary Mirror: | Material | Fine Annealed Pyrex |
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| Coatings | Starbright XLT Coating |
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Secondary Mirror: Material | Hand Figured Fine Annealed Pyrex |
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| Coatings | Starbright XLT Coating |
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Central Obstruction |
| 2.5” | (10% by area) |
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Corrector Plate: | Material | Optical Quality Crown Glass |
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| Coatings | MgF2 Coatings both sides |
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Highest Useful Magnification | 480x | ( ~ 4mm eyepiece) |
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Lowest Useful Magnification (7mm | 29x | ( ~ 70mm eyepiece) |
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exit pupil) |
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Resolution: Rayleigh Criterion | .68 arc seconds |
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Dawes Limit | .57arc seconds |
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Photographic Resolution | 200 lines/mm |
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Light Gathering Power | 843x unaided eye |
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Near Focus standard eyepiece or | ~ 25 feet |
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camera |
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Field of View: Standard Eyepiece | .64º |
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: 35mm Camera | 1.0º x .68º (1.6º x 1.07º - with optional |
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| Reducer Corrector) |
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Linear Field of View (at 1000 yds) | 34 feet |
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Magnification: Standard Eyepiece | 81x |
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: Camera | 41x |
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Optical Tube Length | 17 inches |
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Weight of Telescope | 24 Lbs. |
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Electronic Specifications |
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Input Voltage |
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| 12 V DC Nominal |
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Maximum |
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| 18 V DC Max. |
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Minimum |
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| 8 V DC Min. |
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Batteries Required |
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| 8 AA Alkaline |
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Power Supply Requirements |
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| 12 |
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Mechanical Specifications |
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Motor: Type |
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| DC Servo motors with encoders, both axes | ||
Resolution |
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| .26 arc sec in Azimuth, .32 arc sec in altitude | ||
Fork Arm |
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| Cast aluminum, with integrated | hand control receptacle | |
Electronic Hand Control Specifications |
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Slew speeds |
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| Six slew speeds: 6º /sec, 2º /sec, | 128x, 64x, 16x, 8x | |
Tracking Modes |
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Optional Computerized Hand Control Specifications |
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Hand Control |
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| Double line, 16 character Liquid Crystal Display | ||
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| 19 fiber optic backlit LED buttons | ||
Slew speeds |
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| Nine slew speeds: 6º /sec, 3º /sec, 1.5º/sec, 128x, 64x, 16x, 8x, 2x, 1x | ||
Software Precision |
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| 24bit, 0.08 arcsec calculations |
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Ports |
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Tracking Rates |
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| Sidereal, Solar and Lunar |
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Tracking Modes |
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Alignment Procedures |
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Database |
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| 40,000+ objects |
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| 400 user defined programmable objects. | ||
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| Enhanced information on over 200 objects | ||
Complete Revised NGC Catalog |
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| 7,840 |
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