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Old 04-06-2021, 08:04 AM
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gregbradley
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https://phlearn.com/magazine/f-stops...-need-to-know/

F7.1 to F5 is double the amount of light.

So F7 to F6.5 then is around 23%. I don't know the scale is linear though it may not be.

Theoretically with the same camera it should need around 20% less exposure time for the same brightness image.

Greg.
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