EXCERPT page containing first few paragraphs. 2022-08-16 00:00:55
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Distortion is very similar at infinity focus and close focus.
At infinity focus, there is a predominant barrel distortion reversing to very mild pincushion distortion into the corners (“wave type” distortion).
At close range, the distortion is barrel distortion, reducing to no distortion into the corners.
At either focusing distance, this is a very low level of distortion that would need correcting only for architectural photography or simliar applications where exact linearity is needed.
Toggle to compare distortion at infinity versus close range.
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