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P3D Re: DOF scales

Depth of field varies with magnification.  Only the plane of focus is truly
sharp with any lens, but at small (viewer) magnifications the amount is unnoticeable.

All DOF scales are computed using an average viewing size.  If you are
projecting your slides, it would be different than if you are just using a viewer.

So if you are projecting as well as viewing, y'all need to recompute your DOF
tables using your projection size anyway.

David


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