Quote Originally Posted by Bob-D659 View Post
Did you get a CD of the scans which were used to make the prints? If it's the lens, then the problem would also be on the scans of the negatives.
Good point, but unfortunately I was going for the cheapest workable develop/print solution, so I opted out on the CD.

I guess the ultimate question here is whether or not the chromatic aberration could be caused by a mistake or two in my disassembling/reassembling of the lens and/or a loose rear lens element (not sure if that's the correct terminology)...