^You would then increase your shutter speed by the same amount of stops that you opened up your aperture.
So, let's say you're using 100 speed film and shooting in daylight. Using the f16 rule you would estimate your exposure value to be f16 at 1/125th of a second (haven't come across a camera with 1/100th of a second shutter speed and 1/125th is closest). You now want shallow depth of field and you decide that an aperture of f4 will give you the result you want. That is a difference of 4 stops. 16 - 11 - 8 - 5.6 - 4 , so you now need to adjust the shutter speed by the same amount of stops, 1/125 - 1/250 - 1/500 -1/1000 - 1/2000.
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Last edited by The_Don; 01-06-2012 at 03:54 PM.