Really wide angle lens distort - how can you fix it? The image I use in this tutorial was made with my very wide 12-24mm Sigma on my Canon 5D. I didn't think it showed much distortion, but others thought otherwise. I had experimented with correcting wide angle lens distortion before but never really though about it much after the first experiments. Anyway, after looking at the image again, I though I would re-visit my experimental techniques which, BTW, are pretty simple. So hit the PLAY button and be prepared to be transformed.