One of the things about PS I liked was how it was able to deal with CA, which I had (have) heaps of, in using a Tamron 70-300 lens. But also, it seems, with other lenses I didnt expect it from. I no longer have PS and have not yet found an application either on Mac or on my iPad, which deals specifically with those sorts of lens issues. Of course, in playing with lots of apps, I have probably missed seeing the obvious. Can anyone enlighten?