1

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

2

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

  • 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. – Elenesski Nov 21 '15 at 21:47

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.