The URSA Mini Pro B4 Mount from Blackmagic Design is a replacement mount for use on the URSA Mini Pro. This mount enables using your ENG-style B4 mounted HD lens on your URSA Mini Pro. The mount incorporates corrective optics that enable the use of a lens designed to work on a camera with three sensors and a prism, on the URSA Mini Pro, which is a single-sensor camera, without the image suffering from optical degradation.

The lens mount accepts lenses with a B4 lens mount and features a locking lever to engage the mount's lock. The included shim kit enables precise flange distance adjustment when installing this mount on your camera.