Give a man a fish, and...
The image on my home page has been seriously tweaked from the original. Here's the final result:
And the original:
Image shot with a Canon EOS 1ds iii using a Canon EF 8-15 fisheye lens. Processing in Lightroom 6.
Adobe Lightroom incorporated a "de-fishing" tool (actually applying a lens profile) a few versions ago, and it's been getting better and more aggressive over time. (Us de-fishing afficionados have been using tools like ptlens to do this, but now everyone can get at them!) Simplying applying the lens profile does a pretty decent job, but the really fine work involves going into manual mode and working the vertical, horizontal and distortion settings to make the lines ruler-straight.
There are tradeoffs, however. De-fishing can severely warp objects in the corners (and spread the pixels out a bit, so you might lose a little resolution on the margins), so a fair bit of subjectivity (and subject matter selection) is necessary. For example, if any people were close to the lower-right or lower-left corners, the picture would have looked terribly unnatural.
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