Well I have a set of 16mm mark one arri zeiss superspeeds which I think will be a perfect combo for the BMC.
are you sure these will cover the BMC sensor?
have a read of this test ....I think you will struggle
Andrew Reed says in his BMC lens review posting
What is out? The Canon EF mount rather restricts this choice to lenses designed for photography. Most Super 16mm PL mount lenses are out (as well as being extremely expensive) as the diameter of the mount isn’t wide enough to accommodate their fat rear ends. Several lovely primes which can be had for around $800 are out – the Zeiss Distagon 8mm T2.1 S16 PL, Voigtlander 17.5mm F0.95 and Olympus 12mm F2 would have been lovely lenses on the Blackmagic Cinema Camera. C-mount (the Computer 12mm F1.3 would have been puuurrfect on this camera)