AFMA results - Conflicting values

[HDNitehawk]

What camera are you using? What are you testing with?

The results you posted are not too consistent.

I had varying results as well with my 70-200mm, it was more noticeable on the crop cameras than it was on the 5D II. Mine however was more consistent. It was off opposite directions on the very ends and had very flat results through the range. It never at any point was so far out that it was outside a reasonable DOF.

Really I think you would want the zoom to be its most accurate on the long end, because of your shallow dof. The short end is more forgiving.

[Steph]

What camera are you using? What are you testing with?

The results you posted are not too consistent.

I had varying results as well with my 70-200mm, it was more noticeable on the crop cameras than it was on the 5D II. Mine however was more consistent. It was off opposite directions on the very ends and had very flat results through the range. It never at any point was so far out that it was outside a reasonable DOF.

Really I think you would want the zoom to be its most accurate on the long end, because of your shallow dof. The short end is more forgiving.

I'm testing with a 7D on a tripod 4-5 meters to the target. I'm using the latest version of Focal. The results for a given focal length are actually quite consistent and reproducible so I guess the values given are actually the best for that length.

You're right DOF will be smaller at 200mm so I should probably pick up something closer to 6 than -2.