Used on Nikon D750. Very good aperture, portraits are sharp and at the same time IMHO with "thoroughbred" bokeh. To my satisfaction, there were no errors in back / front focus from the word at all, I didn’t even have to correct on the carcass from 0. I think this speaks of the quality of its manufacture in general (it also feels monolithic and tactilely pleasant in the hands. After selling the D750 and switching to sony a7iii, now we use it on a new carcass through an adapter. Eye tracking and autofocus work flawlessly.