The Blackmagic Design Zoom Demand is a dedicated hardware controller engineered to provide precise, repeatable remote control of compatible broadcast zoom lenses used with Blackmagic Studio Cameras. It is designed for studio environments, such as newsrooms, sports broadcasting, and live production control rooms, where a camera operator needs smooth, responsive control over zoom and focus from a distance, often while also managing other aspects of the production. The Zoom Demand connects to the camera via a dedicated data cable, offering tactile control wheels for both zoom and focus, allowing for professional, broadcast-quality lens manipulation that is difficult to achieve with manual lens rings or less specialized controllers.

The unit features two large, damped control wheels: one for zoom (with variable speed control based on wheel rotation speed) and one for focus. This provides the operator with fine-grained control over lens movements, enabling everything from slow, creeping zooms to rapid focal length changes. It may also include buttons for direct access to preset zoom positions or other lens functions. The controller is designed to work seamlessly with Blackmagic Studio Cameras and compatible B4-mount broadcast lenses that support electronic control, integrating directly into the camera's lens control system.

Housed in a compact, robust metal or high-quality plastic enclosure, the Zoom Demand is built for durability in daily professional use. It is typically mounted on a desk or control panel within easy reach of the operator. By offering a dedicated, ergonomic interface for lens control, this device enhances the camera operator's ability to execute precise visual storytelling, making it an essential tool for any live production setup using Blackmagic Studio Cameras with broadcast zooms.