I have a 24-70L lens that I've had a few years and after some recent comparisons to a couple other lenses, it appears to have more red fringing than I would expect from an L series lens. It's probably been like this since I bought it and just recently shooting at f/2.8 of some high contrast shiny objects it became quite noticeable.
Anyhow I'm likely going to send it off to Canon to hopefully get it corrected. I am wondering if CA is corrected by a "calibration" or adjustment of the lens elements, and what might I expect for an estimate to correct it. I'm in the US on the east coast, so it will likely be sent to New Jersey.