The battery issue is not that simple. Mirrorless cameras need to keep the sensor active and the LCD or electronic viewfinder on during framing/composition, wher

The battery issue is not that simple. Mirrorless cameras need to keep the sensor active and the LCD or electronic viewfinder on during framing/composition, whereas the DSLR only needs to do this for the 1/60th of a second when the photo is being taken.