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The Jacana Astronomy Site |
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Telescope Performance |
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Print this page: File > Print > OK TELESCOPE PERFORMANCE Clear aperture Limiting Dawes Max mm Inch magnitude limit power 50 2.0 11.2 2.3" x 100 60 2.4 11.6 1.9" x 120 75 3.0 12.1 1.5" x 150 100 4.0 12.6 1.2" x 200 112 4.5 13.0 1.0" x 225 125 5.0 13.2 0.9" x 250 150 6.0 13.6 0.8" x 300 200 8.0 14.2 0.6" x 400 250 10.0 14.7 0.5" x 500 300 12.0 15.1 0.4" x 600 Notes: Limiting magnitude refers to the faintest star visible. Dawes limit refers to the closest stars resolvable. Maximum practical power for any given telescope is typically 2 times the aperture in millimetres although in practice powers over about 400 times are not always useful. In all above instances, the figures quoted are for a telescope in good working order and observations are conducted under good viewing conditions.
Source: Derek Haselden's Astronomical Charts & Tables
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