Canon has released firmware version 1.0.3.1.00 for its Cinema EOS C100 Mark II camera.
The new firmware fixes a problem that cause the aperture adjustment on certain lenses to fail to operate correctly when using the control dial on the grip unit. For a list of lenses affected and to download the new firmware, visit http://support-au.canon.com.au/contents/AU/EN/0400279702.html (Windows) or http://support-au.canon.com.au/contents/AU/EN/0400279802.html (Mac OS).