I got my CV 15 yesterday afternoon. It's a lovely little lens, that unfortunately tends to vignette/color shift a bit on my 5N. Nothing I couldn't live with, and in fact, there will be shots that I don't correct because I want to convey a mood (be artistic & stuff). Anyway, I downloaded a copy of cornerfix from soundforge and created a profile for the lens. Pretty straightforward, the key is getting a good image to use as the profile. It took me 4 tries until I got one that was useable. The directions are on the cornerfix site. Cornerfix works with DNG files, so if your camera doesn't save DNG files you have to convert them. I used the import conversion process in Bridge to convert my ARW files to DNG. This was the workflow for this pic. 1) open lens profile in cornerfix 2) open the converted DNG file (no processing yet at this point) 3) save to file after cornerfix does its thing 4) open the cornerfix "fixed" file in ACR, adjust to taste Then I applied the ACR setting to the original DNG file to show the difference between the two files. ***edit to add this pic*** Here's one with a new cornerfix profile based on Dioptrick's suggestion from below. This is the first cornerfix file. And this is the original file, processed with the same settings as the cornerfix file. Rather dramatic difference. I'm still learning how to optimize the results in cornerfix. My profile still has a tiny bit of color shift in the upper corners that I need to resolve, but I'm impressed so far. Cornerfix works with any camera that can save a DNG file (or have its files converted to DNG), and with any lens, so it has broad application.