how much time is there between each flash of light
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Explanation:
After you see a flash of lightning, count the number of seconds until you hear the thunder. (Use the stop watch or count "One-Mississippi, Two-Mississippi, Three-Mississippi," etc.) For every 5 seconds the storm is one mile away.
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The fill flash ratio may therefore be anywhere from 1:1 (in dim light) to 1:4 (in bright light). For situations where the shutter speed is longer than 1/60 of a second, flash in Program mode acts just as it did in Auto mode. Aperture Priority (Av) and Shutter Priority (Tv) modes have even different behavior.
Explanation:
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