Anyone else here have a canon 50mm 1.4? I just picked this one up used and have been kinda noticing some strange color shifts when shooting wide open and up close. Here's an example of what i'm seeing. This is a 100% crop from the original. I focused on the caps lock button, and notice the green and magenta color casts in opposite directions. Is there something wrong w/ my lens, or is this a known issue w/ this lens?