Here are some test images showing barrel distortion and corrections. I had done something similar [url="/photography_tips_techniques1/f/13/t/5120.aspx]previously[/url], but in that case there was both barrel distortion and perspective distortion in the mix. IN this comparison, there's only barrel distortion. Apologies for the lack of inspiration in subject matter - I wanted to find something more interesting than this classic approach to showing barrel distortion, but I had limited time this morning as the snowflakes were starting to fall (silly me, I [i]thought[/i] it was the first day of spring...).


Images were shot on a 5DII with the 24-105mm f/4<span style="color: #ff0000;"]L IS, except for the bottom right image shot with a TS-E 24mm f/3.5<span style="color: #ff0000;"]L II. Both DPP and DxO do a good job correcting the barrel distortion of the zoom lens. DPP crops the corrected image a little bit tighter than DxO, such that the centers of the edges are the same in the uncorrected and DxO images. Interestingly, 24mm on the 24-105mm is a little bit wider than the 24mm TS-E framing. Click image for a larger view.