meh,, nikon seems to work fine for me
the arguments that the plane of focus will be off
is the same stuff that i always heard and was warned about
when i was told NOT TO use my normal graflex 23 roll film adapter
on the back of my graflex series d slr.
so i put it on ( used black masking tape ) and took a few rolls, wide open
with my tessar 21cm f3.8 ... focus sharp as a tack.
people just like to claim stuff and once in a while i turns out not to be true...