A 16-50 4L would be great for my video shootings
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15. Removed "support" for 3rd party batteries...
You can still use them, but you get a warning and they are shown as 100% charged.
So, why are there two versions for windows in the canon usa site http://usa.canon.com/cusa/professional/products/professional_cameras/digital_slr_cameras/eos_5d_mark_iii#DriversAndSoftware ?