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Telescopes (กล้องดูดาว) > Celestron >
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ITEM # 91075 ROWE-ACKERMANN SCHMIDT ASTROGRAPH |
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ITEM # 91075 ROWE-ACKERMANN SCHMIDT ASTROGRAPH - 11-inch f/2.2 optical design with rare-earth glass for images free of false color, coma, and field curvature
- 43.3mm optimized image circle maintains pinpoint stars to the far corners of even the largest astroimaging sensors, while the usable field extends even further to 52 mm for larger format sensors.
- Custom engineered linear brass focuser bearing reduces image shift, while dual-speed 10:1 FeatherTouch Micro Focus Knob provides the most precise focusing
- Quiet, high-output 12V MagLev fan reduces cooldown time and blocks dust
- Common camera adapters (T-thread and M48) included for easy attachment to popular CCD and DSLR cameras
SPECIFICATIONS| Optical Design | Rowe-Ackermann Schmidt |
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| Aperture | 279 mm |
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| Focal Length | 620 mm |
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| Focal Ratio | 2.22 |
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| Backfocus from front lens assembly | 72.80 mm |
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| Backfocus from included camera adapters | 55 mm |
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| Central obstruction diameter | 114 mm |
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| Finderscope | Not included |
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| Light Gathering Power (Compared to human eye) | 1588x |
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| Optical Coatings | StarBright XLT |
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| Total Telescope Kit Weight | 43 lbs |
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| Included items | 11-inch optical tube assembly, 42 mm T-thread camera adapter, 48 mm camera adapter |
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| Resolution (Rayleigh) | 0.5 arc seconds |
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| Resolution (Dawes) | 0.41 arc seconds |
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| Optical Tube Length | 33 in |
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