EXCERPT page containing first few paragraphs. 2020-07-07 19:08:26
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Pincushion distortion (bowing inwards) reaches about 1.4% into the extreme corners, an amount that can be an issue for flat horizons or architecture or groups of people. It is also double the amount of the 0.6% barrel distortion of the 45/3.5.
For myself, I find pincushion distortion more unnatural looking versus barrel distortion, particularly for human faces, but also horizons, even architecture. The world tends to bow-out or round-out, not pinch in as with pincushion distortion—it feels unnatural.
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