EXCERPT page containing first few paragraphs. 2022-08-16 00:52:36
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Pincushion distortion (bowing in) reaches about 0.6% into the extreme corners, a low amount that generally does not require correction except for subjects involving straight lines, such as buildings or horizons, though the pinched bowing-in effect is never ideal.
Distortion correction could take care of this distortion with minimal loss to micro contrast since very little stretching needs to be done. But the distortion is so low that leaving it uncorrected most of the time is the best course.
See the example of uncorrected vs corrected further below.
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