EXCERPT page containing first few paragraphs. 2019-03-25 02:00:22
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This scene examines a typical scene for a 24mm whose structure includes a immediate foreground substantial detail at mid range, and receding contextual details at a greater distance.
Choice of focus
There is no way to make such a “deep 3D” scene sharp near to far without stopping down quite a bit, and invariably a judgment call has to be made on which area (distance) of the subject to favor.
Knowing that there is a forward field curvature at the periphery and that there is also a goodly amount of foreground, focus for this scene was placed on the leading edge of the building—counting on stopping down to deliver sharpness over the whole building as well as the foreground which benefits from the forward field curvature. The far distance at the periphery can be expected to require stopping well down, but because it serves mainly as context, it is not a consideration for choice of focus distance.
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