shedberg wrote in post #16586424
If it's an issue with that particular lens, it should need to be adjusted on both cameras though, right? If it's an issue with that particular camera body, all lenses should need to be adjusted on it?
You might think. And I've seen it explained this way. However, the reality is that it varies between lenses and bodies in no obvious pre-defined manner.
I have 3 MA bodies and several primes and nothing is consistent. In other words I cannot say one body is 'off' or even that a particular lens is 'off'.
For instance my Sig is +12 a near distances and 0 at infinity on both my 7D and 5DII. On the 5DIII it is 0 near and far.
My 135L is 0 on the 5DII, -5 on the 7D and 0 on the 5DIII.
135 + 1.4 TC is -5 on the 5DII, 0 (or +3, I don't remember, but I know it goes the opposite way as the 135 without the TC) on the 7D and untested on the 5DIII.
My 50 1.4 is zero on all 3 (within AF accuracy)
My 100L is zero on the 5DII, +5 on the 7D and 0 on the 5DIII
Now if you can make sense of that from a 'lens is out by this much and camera out by this much perspective', then good luck. The 135L with and without the TC dispelled that myth for me when I first got the 7D and tried to compare with what it did on the 5DII.