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How is exposure time determined in astrophotography?

Asked: πŸ…‘πŸ…—πŸ…πŸ…–πŸ…πŸ…£, Last Updated:

Basically, to determine the optimal length of exposure, you take 500 and divide it by the effective focal length of the lens (Exposure time = 500/[crop-factor Γ— focal length]). Thus, the shorter the focal length the longer the shutter speed, and the better images you'll get.

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