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Old 26-07-2011, 04:42 PM
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[1ponders] (Paul)
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Join Date: Nov 2004
Location: Obi Obi, Qld
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Ianska your exposure time to eliminate star trailing is a function of length focal length and where you are aiming in the sky. To prevent trailing T(sec) = 700/FL of lens. So roughly where the center of your shot is (Celestial Equator or 0 deg Declination) @ 17 mm you should be able to get 40sec without trailing being obvious.
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