cambyses Offline Upload & Sell: On
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Well, I think the main purpose of the lock is to prevent lens creep against gravity when it is pointing down. At 600mm, the lens barrel is already fully extended and so naturally there will be no creep anymore. That being said, I can see how the lock at 600mm would be helpful if you are shooting subjects in the sky and thus the gravity could possibly cause reverse lens creep.
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