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      01-05-2017, 09:24 AM   #9
dcstep
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Drives: '09 Cpe Silverstone FR 6MT
Join Date: Nov 2008
Location: Colorado

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2009 M3  [4.20]
Remember, on DSLRs, some of that battery voltage is needed to drive the AF and IS on large, super-telephoto lens. It's also driving the mechanical shutter and mirror, not just circuits.

That said, how much the GPS runs and the back screen is on seems to be the biggest factor in battery life. Life and power are, of course, two different things.
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