A beginner's question: If I have the IS switch set to "on", are the lens' gyros and electronics continuously working or do they only activate when the shutter button is pushed half-way down? Do they continue to operate after a shot or turn off immediately? Does this apply to all IS lenses or are the L lenses like the 70-200/2.8 different than the 28-135/3.5-5.6? Thanks, John Lovda
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