You noted that a power winder is optional for the Canon EOS 5D Mark II. What does it wind, then?
It winds film. (Joking Ano, just joking.)
I was referring to the Canon BG-E6 battery grip, which doesn't enable faster burst-rates, but does increase the number of stills and video you can capture by adding a second battery (and the option to use 6 AA batteries).
The BG-E6 also features a 2nd shutter release and command dial for easier shooting when holding the camera in portrait mode.
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