If one never uses a shift lens and just relies on the Skew
transformation, then there will be a sharpness loss in strecched areas
over that of the photograph which employed a shift lens and no Skew
transformation, or perhaps used Skew to tweak a minor correction from a
shift lens which wasn't a perfect correction.
Architecture isn't the only subject Skew is good for. Start looking at
any shot with a wide angle lens in which the camera was tipped up or
down and the skewing will be apparent. It is rampant in landscape grab
and 35mm shots. Most trees grow straight, but they don't come out that
way when the camera is angled.
Gary Reese
Las Vegas, NV
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