Originally posted by D1N0
More megapixels mean you need more processing power to develop the pictures. It's not the sensor itself drawing more power, but the prime III. 50% more pixels and 25% reduction in batterylive means the K-3 can shoot more pixels on one charge than the K-5.
Thanks. That seems plausible ... if the processing is the main contributor to power usage. It was never obvious to me whether power usage in a camera is dominated by electrical (e.g. picture processing, LCD illumination) or mechanical (e.g. lens focusing, aperture stop down, mirror raising) processes. The K5/K3 battery life difference suggests the former if you are right.