I got DXO ViewPoint software for distortion correction while it's on sale for $49 and it's a mixed bag but I'll use it for some things. For instance, some found the distortion of the ball a problem in the following shot. I thought it was kind of surreal looking, but it wasn't generally appreciated and that's a problem when an image doesn't present like you want it to. This image and it's derivatives are all taken with a Panasonic G5 and the Lumix 7-14mm f/4 lens. Come and Play with Us! Forever, and ever, and ever... by Entropic Remnants, on Flickr Okay so with the problem stated, I fired up Lightroom and made a virtual copy of the original image and right clicked on "Edit In" and selected "DXO ViewPoint". Here was my first attempt letting the software select the correction. It completely corrected the roundness of the ball but made the shot into a mild fisheye shot doing it. As a result of the stretching, I lost the top of the arch and that bothered me. Come and Play with Us! Forever, and ever, and ever...(alternate edit) by Entropic Remnants, on Flickr So I went back in and had another whack at it and reduced the amount of correction in manual. The ball is now not quite round, and the fisheye distortion is less. I also have more of the top of the arch. Not a bad compromise. I've also made some other editing tweaks. If color/contrast and so forth looks a little different -- it is but it's not from ViewPoint. Come and Play with Us! Forever, and ever, and ever...(alternate edit 2) by Entropic Remnants, on Flickr Now you clever folks might say, "I can correct that fisheye problem now with Lightroom's distortion slider". No, you can't. When you do that, the ball goes back to being oval and you've got the original shot again minus some edge loss, lol. So if you get this software be advised: it's not a panacea for everything.