I’ll start this article by saying I love shooting vintage glass for the character it can imprint on my images. I love the swirly bokeh, the bloom, and the flares and color rendition, but I don’t always want the lens distortion, the chromatic aberration, or the vignette that these lenses naturally have.
Recently I picked up a Nikon 20mm AFD lens from the local second-hand market, which, to be honest, is not even that vintage, as production started in 1989. But being a wide-angle lens, it has quite a significant barrel distortion and heavy vignetting. I do suspect that the one I got might be a bit damaged as it blooms more than any of the really vintage lenses in my collection, so maybe it has been tinkered with.