The Blackmagic Design Focus Demand is an add-on accessory for the Blackmagic Studio Camera 4K Plus, Studio Camera 4K Pro, and URSA Broadcast G2 (B4), that allows for electronic focus control of compatible servo lenses via the camera’s USB Type C ports. The rental includes a tripod handle clamp, and if you’re also renting a Blackmagic Design Zoom Demand, you’ll be able to daisy chain the devices together to leave a USB port open for external SSD recording.