EXCERPT page containing first few paragraphs. 2019-03-24 15:28:16
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Distortion for the Pentax 25mm f/4 is very well controlled. It is barrel distortion, perhaps with a faint trace of pincushion into the extreme corners—but effect just plain barrel distortion.
The distortion is easily corrected when converting from raw in Adobe Camera Raw simply by checking the distortion correction box.
Toggle to compare the uncorrected to corrected version.
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These systems are hugely expensive, so make the right choice for your own needs (full frame vs medium format).
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