I have a love/hate relationship with this website. You all make me spend money . I used to be so happy with my 30d and kit lens many years ago. Now, several years later and several thousand dollars lighter, I've got tons of stuff I never knew even existed.
After reading about all the micro adjustments being done, I broke down and bought the Focal software.
So I ran it on my 5 lenses. 17-40 was spot on. 50 didn't register an accurate result, but most seemed to be in + range, so I gave it a +2. The others were in the +/- 3-4ish range. On a couple focal lengths I got up to 5 or 6 range.
So, what does that all mean? Am I going to notice a difference on those kinds of adjustments? I guess my question is, how bad is a -3 or +4 to having a "good" copy?