Im trying to figure out what the best lens mount would be for the Canon CN-E's? Would need it to be a locking EF mount for Follow Focus. I see Metabones makes one and C7. Curious if anyone has suggestions. I tried using my Wooden Camera RED DSMC2 PL mount with my DZO Zooms and no shim level got me clear focus. I saw Vocas has a large shim for sale on their site, but its not currently available. Any help on both EF and PL would be greatly appreciated!