I spent a good hour today moseying after some azure-winged magpies. We had a nice waltz across a parkland, they rarely letting me get close enough to even contemplate a shot. As such, I spent long stretches (~10min) with my Nikon DSLR on but not in use.
And then I began wondering about power drain in such situations (switched on but untouched), and how different that status actually was from off, and after what period of time it makes sense to go ahead and switch the camera off?
Answer
It really depends on the model but modern cameras are very good at saving power during sleep mode.
Sleep mode however on most cameras consumes some non-negligible amount of power, so if you wanted the more battery-life then turning it off is better.
Even better than off is to remove the battery as some cameras, particularly Nikon DSLRs, use power even when off.
That being said, most DSLRs can last for days if not longer in sleep mode, so I would not really worry about it unless you went somewhere without access to power for days.
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