Quote:
Originally Posted by sdo01
O ring where might one find this? hate it when the lens zooms out then walking about.
Yeah mine is also a 1st gen model glad to hear you have not had any issues with yours 
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Just check out any good plumbers merchants, take your lens and ask them to have a look for one that is a fairly close fit around the barrel.
I have one which is not a true O ring, more of a seal. It is flat on the inside and as such straddles the join between the rotating zoom ring and the fixed part of the lens. I think it is a seal out of a waste pipe fitting.