pstyle1 wrote in post #16174785
I can't for the life of me get it to AF at or close to minimum focus distance.
Seeing the title, I was all set to declare thin DOF, but agree with those above. If you're setup drifts even 1mm closer than MFD, AF will stall out. You must choose between having AF and achieving 1:1. AF needs you back enough to give it room to work. As you drift to and fro, it must focus to and fro, to account for your movements.
To test function, just use a tripod and move in close. It AF works when solid and under the MFD limit, the lens is not the issue. BTW, this happens with other lenses, but MFD has less importance with most. Get what you can in real life and crop the rest of the way.