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Description
Lens correction (https://ru.wikipedia.org/wiki/%D0%94%D0%B8%D1%81%D1%82%D0%BE%D1%80%D1%81%D0%B8%D1%8F or https://en.wikipedia.org/wiki/Distortion_(optics) ) affects many cameras, leading to subtly flawed images.
There exist databases of the ways in which different cameras or lenses distort photos, examples at lensfun.github.io/lenslist and https://github.com/gyroflow/lens_profiles