Hi there! I'm looking out for a 2nd-hand zoom for my FM2..something like 70mm- 210mm. (Mostly on Ebay UK). But due to my budget at present, i am reluctant to fork out big bucks for a Nikon lens when i suspect there are some very good generic lenses available more cheaply. Trouble is, how to know the bargains from the rubbish....i still want as much sharpness + contrast as possible. Speed as well, but i can compromise on that. One lens that is available to me at the moment is Vivitar 28 - 200mm macro focusing zoom. Anyone know anything about this one?? I've also seen a couple of Tokinas and I passed on a very cheap Sirius 60mm-300mm because that was one of the first I came across at the start of my search and I didn't want to jump in too quickly. Any comments welcome, especially advice about brands that are reliable and those which would be false economy. Thanks!