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I know what barrel distortion is, but how do I take a 4% rating and relate that to an image?

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We desire a faithful image. We image a rectangle with the same aspect ratio as our camera’s senor/film frame. If we image at unity (life-size) we expect the image of the rectangle to kiss-off at the corners of the image area. With barrel distortion the image will under spill. With pincushion distortion, the image will over spill. The delta  (valuable increment) is expressed as a percentage of the height of the frame. 4% is scarcely noticeable. enter image description here

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  • \$\begingroup\$ One reviewer of the lens I'm looking at said there was significant barrel distortion; so they must have had some requirement for no distortion. Your right 4% isn't that much. But I'll look at that when I try the lens in the store. Thanks. \$\endgroup\$
    – Elenesski
    Commented Nov 21, 2015 at 21:47
  • \$\begingroup\$ what happens when you reach 100% distortion? rotated image? \$\endgroup\$
    – rackandboneman
    Commented Jan 13, 2020 at 22:00

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