I do the same thing with my cat, just candid shots.
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FWIW, Canon warns against powering off the camera or unmounting the lens while the IS is operating.
I check for Ken rockwell opinions all the time and throw out what is a joke to me but he's mostly legit. His work also for the most part backs that up. The thing is i cant bring myself to read his write up if thats what he is stating because my experience is that for the first time the F1.2 lens i use is dead on accurate at f1.2! What kinda lame crap is a review saying its more complicated but not better BS? This focus in near dark locks on, i cant get my 1dm3 or my 5dm1 to do anything close to that.