The URSA Mini Pro Shim Kit from Blackmagic Design includes 9 shims and a baffle tool. The kit permits you to adjust the flange focal distance of your mount to meet the exacting tolerances required for the maximum lens performance of the URSA Mini Pro.
These precision cut shims allow the mount to pass electronic information from camera to lens mount and can be used with any of the replaceable lens mounts for the URSA Mini Pro.