isn't it depand on body? well, at least for Dynax 7, i can use the function (MTF) , it allow me to use AF/MF at the same time without pressing any button. It works for any lens. I think I showed it to CKIANG and YSLEE at JBP last week.Originally posted by kraterz
Another diff is with USM you can use AF and MF at the same time without switching. .