• UPDATE



    The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being.

    I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure.

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I 'll be shooting some tennis games (and by some I mean a lot) this weekend with the 100-400. I'll be using speeds in the 1/1000 - 1/4000 range. Is there any reason I should leave IS on? Even mode 2 won't be useful in this situation, so why not turn it off and save some battery life too?
Your thoughts?