Michael Best from ARRI Professional Camera Accessories demonstrates on an the ARRI ALEXA camera the very versatile options offered by the modular MB-20 I and II matte box systems.
The Matte Box-20 (MB-20) series easily adapts for use with lightweight support, bridge plate support rods, or clamped onto and supported by the camera lens.
For more about the ARRI Matte Box-20 series please see ARRI.