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Old Mar 3, 2006, 11:21 AM   #1
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Where do the Canon IS lenses get there power from? Is there a separate battery that slips into the lens itself or is it powered off the camera's battery? What type of draintime does it have?
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Old Mar 4, 2006, 5:21 AM   #2
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Canon's USM autofocus and IS mechanisms get their power from the camera's body...

-> No one really measure this 'drain' time, but in general a D70, D100 or D200 will usually outshoot a Canon because their integrated focus motor in the body is more efficient at this (but then they also have some externally driven AF-S lenses)

I have a Canon and I can usually fill a 1G card with any USM/IS lens combo. If I can shoot over 300-400 shots on 1 charge depending on how often I recomposed then the battery 'drain' really becomes a non-issue (I usually bring a spare too) - unless of course if one travel in the jungles
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