Mabelsound - as a slight aside, I recently acquired a 75-150mm zoom for my OM-1, cost me next to nothing and it looks as if it's had a hard life. However, despite my negative assumptions about all 70s zooms, I shot a roll through it a couple of days ago and the results look very good. I've only scanned a couple of the negs (and admittedly I haven't had a chance to look at them closely) but on the basis of my first look I think I will be keeping it. I've read that there is a fair bit of sample variation with these lenses and I may just be very lucky, but I wouldn't get rid of it until you've tried it.