Blackmagic Design B4 Control Adapter Cable (for use with Micro Studio Camera 4K)

Blackmagic Design B4 Control Adapter Cable

The Blackmagic Design B4 Control Adapter Cable is a vital bridge for studio environments, specifically designed to connect professional B4 broadcast lenses to the Blackmagic Micro Studio Camera 4K.

In 2026, while the Micro Studio Camera 4K G2 has gained popularity for its USB-C capabilities, the original 4K model remains a fixture in fixed-install and fly-pack kits, and this cable is the only way to achieve seamless broadcast-style lens integration with that specific camera.

Core Functionality

• Lens Communication & Control: This cable translates the camera's control signals into the analog/digital language used by B4 broadcast lenses. It allows for remote control of Iris, Zoom, and Focus via an ATEM switcher or a remote camera control panel (RCP).

• Power Distribution: B4 lenses require their own power to operate the internal servo motors. This cable pulls power from an external source (via the camera's expansion system) and delivers it to the lens, ensuring the zoom rocker and iris drive have the voltage they need to function.

• Metadata Pass-through: It enables the lens to send positional data back to the camera, which can be critical for live production workflows where the operator or director needs to see exact aperture or focal length values on their tally or multiviewer.

Installation & Connectivity

The connection process is unique due to the Micro Studio Camera's compact "Expansion Port":

1. Camera End: The adapter cable does not plug directly into the camera body. Instead, it plugs into the 9-pin DB-9 connector found on the camera’s Expansion Breakout Cable.

2. Lens End: The other end of the cable features a standard 12-pin Hirose connector, which is the universal connection found on the "pigtail" cable of almost all Fujinon and Canon B4 broadcast lenses.

3. Power: The expansion breakout cable must be connected to a 12V power source (like the included AC adapter or a V-Mount battery) to provide the current necessary for the lens servos.

Technical Specifications

Operational Insight (2026)

In 2026, this cable is frequently paired with a B4 to MFT Optical Adapter. Because the Micro Studio Camera has a Micro Four Thirds mount, you need both a physical mount adapter (to hold the lens) and this control cable (to talk to the lens).

Pro Tip: If you are using an older B4 lens that only supports analog control, you may find that the iris control works, but the zoom/focus data does not appear in your metadata. This cable is optimized for digital B4 lenses, though it remains backwards compatible for basic power and iris on most analog models.