Description
#11008
La Maison de l'Astronomie
La meilleure sélection d'instruments depuis plus de 30 ans au Québec – Montréal
5,980.00 $
EdgeHD Whitepaper
The Celestron Product Development team has released a whitepaper outlining the technology behind EdgeHD. This paper describes the development goals, design decisions, optical performance, and their practical realization in 8-, 9.25-, 11-, and 14-inch apertures. We include cross-sections of the EdgeHD series, comparative spot diagrams for the EdgeHD and competing “coma-free” Schmidt-Cassegrain designs, a table with specifications for visual and imaging, graphics showing how to place sensors at the optimum back-focus distance, and details on the construction and testing of the EdgeHD telescope series.
# 11008
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Click here to download the whitepaper.
| Optical Design | EdgeHD |
|---|---|
| Aperture (mm) | 235 mm (9.25 in) |
| Focal Length | 2350 mm (93 in) |
| Focal Ratio | 10 |
| Focal Length of Eyepiece 1 (mm) | 23 mm (0.91 in) |
| Magnification of Eyepiece 1 | 102 x |
| Finderscope | 50 mm Finderscope with quick release bracket |
| Star Diagonal | 2″ w/1.25″ adapter |
| Mount Type | Dual Fork Arm |
| Accessory Tray | Die Cast Aluminum Leg Brace / Eyepiece holder |
| Tripod | Heavy Duty Stainless Steel Adjustable |
| Power Requirements | Car battery adapter |
| Highest Useful Magnification | 555 x |
| Lowest Useful Magnification | 34 x |
| Limiting Stellar Magnitude | 14.4 |
| Resolution (Rayleigh) | 0.59 arc seconds |
| Resolution (Dawes) | 0.49 arc seconds |
| Light Gathering Power (Compared to human eye) | 1127 x |
| Apparent Field of View | 0.8 ° |
| Secondary Mirror Obstruction | 3.35 in (85 mm) |
| Secondary Mirror Obstruction by Diameter | 36% |
| Secondary Mirror Obstruction by Area | 13% |
| Optical Coatings | Starbright XLT Coating |
| Total Telescope Kit Weight | 58 lbs (26 kg) |
| Tracking Rates | Sidereal, Solar and Lunar |
| Tracking Modes | Altazimuth, EQ North and EQ South |
| Alignment Procedures | SkyAlign, Auto Two-Star Alignment, Two-star Align, SolarSystem Align, EQ North Align, EQ South Align, One-Star Align |
| Periodic Error Correction | Permanently Programmable |
| Communication Ports | RS-232 communication port on hand control |
| Computer Hand Control | Double line, 16 character Liquid Crystal Display; 19 fiber optic backlit LED buttons |
| Database | 40,000+ objects, 100 user defined programmable objects. Enhanced information on over 200 objects |
| GPS | Internal 16 channel |
| Warranty | 2-year Telescope Warranty |
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