Blackmagic Design Camera Lens Cap B4

The B4 mount cap is an original Blackmagic Design part for cameras with a B4 mount. You put it on the empty mount whenever there is no lens on the camera, and it protects the space behind the mount, including the sensor and internal electronics, from dust and dirt during storage and transport. It is made only for the B4 mount; other mounts have their own caps.

B4 mount cap for Blackmagic cameras

A replacement camera body cap that covers the B4 mount whenever you take the lens off.

B4 mountCamera body capOriginal Blackmagic Design

Never leave an open mount without its cap

Between lens changes, in the bag and in transit, the cap covers the opening into the camera and keeps dust away from the sensor.

Protects the B4 mount

The cap goes straight onto the B4 mount of the camera when no lens is attached. It is not a front lens cap but a part that covers the camera body itself.