I remember thinking the focus ring felt weird, but I thought that was just the quick-focus. (I think it was my first quick-focus lens.) My copy didn't have any front- or back-focus issues, and the focus ring wasn't actually loose. I hope if you purchase it again you get a good copy. Once mine (eventually) focused, it was spot-on every time.
---------- Post added 12-05-18 at 02:12 PM ----------
Originally posted by stevebrot That's a really good point. I didn't actually look at the rumor until after I replied to Lev. I think it's safe to say that there either weren't plans to refresh them or they fell through. Besides, from all accounts, if I was going to refresh the pair, I'd probably rework the 16-50. It doesn't seem to get much love.