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Blackmagic Design

Blackmagic Design BMD-CINEURSAMUPROTB4HD URSA Mini Pro B4 Mount

$559.00

The URSA Mini Pro B4 Mount from Blackmagic Design is a replacement mount for use on the URSA Mini Pro. This mount enables using your ENG-style B4 mount HD lens on your URSA Mini Pro. The mount incorporates corrective optics that enable the use of a lens designed to work on a camera with three sensors and a prism, on the URSA Mini Pro, which is a single-sensor camera, without the image suffering from optical degradation.

The lens mount accepts lenses with a B4 lens mount and features a locking lever to engage the mount's lock. The included shim kit enables precise flange distance adjustment when installing this mount on your camera.

The integrated optics support HD resolution and are designed with spherical-aberration correction that compensates for the lens being used on a single-sensor camera while designed for a three-sensor/prism-block camera.

View Product Features
  • For HD Lenses with B4 Mount
  • Integrated Optical Elements
  • Spherical-Aberration Correction
  • Includes Shim Set
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    BMD-CINEURSAMUPROTB4HD

    Blackmagic Design BMD-CINEURSAMUPROTB4HD Blackmagic URSA Mini Pro B4 Mount

    $559.00
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About the Blackmagic Design BMD-CINEURSAMUPROTB4HD URSA Mini Pro B4 Mount

The Blackmagic Design URSA Mini Pro B4 Mount is an interchangeable lens mount adapter that allows the URSA Mini Pro 4.6K G2 and URSA Broadcast G2 cameras to utilize standard B4-mount broadcast and ENG (Electronic News Gathering) lenses. This mount is engineered for live production, sports broadcasting, and studio environments where the operational benefits of broadcast lenses—such as power zoom, servo-driven focus and iris, and built-in optical image stabilization—are essential.

It features an integrated optical element that corrects for the inherent magnification and focal length shift that occurs when projecting the large image circle of a 2/3-inch B4 lens onto the camera's larger Super 35mm sensor. This optical correction ensures the lens performs as intended, maintaining its advertised field of view and focus calibration.

The mount includes electronic contacts that communicate with the camera, enabling control of zoom, focus, and iris via the camera's side grip controls, a connected studio remote, or a compatible control panel, seamlessly integrating broadcast lens functionality into the URSA Mini Pro ecosystem.

Key Features

  • For HD Lenses with B4 Mount
  • Integrated Optical Elements
  • Spherical-Aberration Correction
  • Includes Shim Set

Blackmagic Design BMD-CINEURSAMUPROTB4HD URSA Mini Pro B4 Mount Specs

Compatibility & Mount
Compatible Cameras
URSA Mini Pro 4.6K G2, URSA Broadcast G2
Mount Type
B4 Mount with electronic contacts
Optical System
Integrated glass optical group for 2/3" to Super 35 sensor adaptation
Lens Communication
Full electronic communication for zoom, focus, and iris control
Optical Performance
Focal Length Factor
Approximately 1.7x (varies slightly; a 14x B4 lens behaves like a 24x lens in terms of field of view on the S35 sensor)
Aperture
Maintains the lens's native f-stop range with minimal light loss from the optical group
Control & Connectivity
Control Protocol
Blackmagic URSA Lens Protocol / Standard B4 servo protocol
Control Functions
Enables electronic control of Zoom, Focus, and Iris from camera controls or external units (e.g., Focus Demand)
Connection
Connects directly to camera's internal lens control circuitry
Physical & Electrical
Construction
Precision metal and optical glass assembly
Power for Lens
Provides power to B4 lens servo motors directly from the camera
Weight
Substantial due to optical elements and metal housing
Installation
User-installable; replaces the camera's factory default mount

Key Features

  • For HD Lenses with B4 Mount
  • Integrated Optical Elements
  • Spherical-Aberration Correction
  • Includes Shim Set
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