EXCERPT page containing first few paragraphs. 2021-01-26 20:05:39
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Distortion is interesting—
- At distant focus it is pincushion distortion (bowing in) as is typical for medium telephoto lenses.
- At close range, distortion reverses to barrel distortion.
- At some intermediate range, the distortion should be zero.
Quite possibly the zero distortion area is around the distance required for a head and shoulders portrait.
The reversal of distortion calls into question what lens corrections might do; the distortion cannot be properly corrected (could be made worse): the focusing distance must be known and utilized.
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