Originally Posted by Steve Gantlett
... Maybe Malcolm was just unlucky and his lens might have 'gone' anyway.
Very difficult to say just what caused my lens to fail - and as I was using the supplied Canon padded case, I feel it's worth mentioning - particularly as board-walks aren't uncommon at bird reserves.
I know from my work in avionics that hitting a resonance (and dwelling on it) can be quite devastating to equipment, but whether that was the problem in my failure, I've no idea. I still don't know why one Canon approved repairer was unable to fix it, whilst Lehmann's, also Canon approved, did a good repair, and without charging for any parts.