From Dan Chung:
"There is growing evidence that several owners’ production models of the Blackmagic Cinema Camera are experiencing serious issues with infinity focus on certain lenses. Initially, users identified the popular EOS fitTokina 11-16mm f2.8 as a problem lens, with an inability to focus anywhere near infinity when used with the BMCC. Now other users are reporting that other lenses are affected too."
(Edited the post - topics not allowed to consist of one URL and nothing else, and Dan was the original source for this info.)