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How do you calculate the 500 rule?

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The 500 Rule For Astrophotography500 / Focal Length = Shutter Speed (Round down to nearest zero) For example, if you are shooting with the Sony Alpha 7S III and Sony 14mm f/1.8 G Master lens, this is how you would calculate your shutter speed:500 / 14 = 35.71. ... 500 / 35 = 14.28.
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