No-one has mentioned Vivitar yet and I've never before got beyond the mechanics of them, which always seem rather sloppy and graunchy. However, I bought a K-mount 28 - 80mm zoom (or something around that range) for the simple reason that it was only five pounds in a flea market.
Originally Posted by mhv
Sure, it was sloppy and graunchy but I took it along with me for an afternoon's work on a feature article for a magazine and one of the images from that lens ended up on the cover.
Beware of zooms with anything wrong with them, though. Repairers don't seem to like fixing them and charge accordingly!
Steve (and please let us know how you get on!)