http://www.metabones.com/article/of...bmpcc-speed-boosters-available-starting-today Holy maximum aperture Batman! An f1.2 becomes an f.74 on the Pocket Cinema! There are two versions. One is for the full size Cinema camera with a .64 magnification and 1.33 stop increase. The other is for the Pocket Cinema and has a .58 magnification and speeds up the aperture 1.66 stops. Not sure exactly why they say they won't fit and could damage regular m4/3 bodies. Sure they would vignette but not fit? BTW they also add instant clickless aperture rings to whatever Nikon lens is fitted. They are also very affordable, being just shy of $500.