Originally posted by JimJohnson Generally speaking, those plastic mounts are strong. Any shock severe enough to break the mount is highly likely to cause other damage to the lens. When the rest of the lens barrel is also plastic, the only thing a metal mount is doing is adding weight - or (this is an opinion, not a personal attack) snob appeal.
Metal mounts are no heavier than plastic, in fact, the 18 - 55 WR and the DA L versions weigh in at 8.1oz. each. The 18 - 55 AL II, with metal mount, weighs in at 7.8oz.. I also don't get the "snob appeal" factor, as the mount is unseen when it's on the camera! I've seen plastic mounts broken from falls, never seen a broken metal one. I've banged my lenses (all metal mounts) off countless door frames, trees, walls, etc., as well as a few drops to the floor, ground, pavement, over the years while mounted to my camera and have yet to damage camera OR lens mounts. Not so sure I'd be able to make that same statement if I were using plastic mounts, so to me, a metal mount makes more sense.
Of course, that's just my opinion, I could be wrong!