Bought this on the 'bay in OM mount last week for not very much money and it's just turned up today. Looks a really nicely constructed lens with smooth focussing, nice aperture ring, snappy iris and nice clean optics. I've heard a lot of good stuff about this lens and am looking forward to having a play with it. Weather is horrible today though so will have to wait until later in the week. Still not given the vivitar 70-210 a run out yet either.