Originally Posted by
xkaes
A ND filter does not change the DOF. It just cuts down the light getting to the film. So how much DOF you want needs to be determined first. At the same time, you need to determine what speed you want to shoot at. An ND will impact either of these -- or both.
Instead of opening the lens to compensate, you can use a slower shutter speed and preserve the DOF.
One problem is that different manufactures use different designations for their ND filters, for example ND4, 0.6ND, ND2X, etc. They do this just to muddy the waters.
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