I've just purchased a Canon 70-200mm F2.8L IS lens new from a Melbourne store. It has a bit of a clunk noise when the IS starts and again when it stops. It's not very loud, but I would say it is pronounced. I don't recall hearing this from the 55-250 kit lens and the noise from the 24-105 IS is much quieter.
Just wondering if others with this lens hear similar things from theirs?