Originally posted by creampuff Well I've owned plenty of cameras to know that polycarbonate plastic is pretty durable. However I recently went to a camera repair shop locally and the store owner showed me a drawer full of usable but damaged Nikon and Canon kit lenses. All had damage at the plastic bayonet mount either from being cracked or sheared off from impact.
I wonder, though, how a metal mount would have fared under the same circumstances. And I wonder if an impact strong enough to snap the mount might be just as likely to damage the lens in other ways - especially if the plastic mount hadn't absorbed so much of the shock while breaking. Also, if your equipment is insured (and it would cost literally pennies to insure a cheap plastic mount lens), I am not sure I'd be too worried.
Anyhow, not saying don't give it a shot if you're so inclined, nor am I saying I wouldn't prefer to buy lenses with metal mounts. Just trying to add a little perspective.