Blackmagic URSA Mini Pro B4 Mount (NOT compatible with URSA Mini Pro 12K)

The Blackmagic URSA Mini Pro B4 Mount is a specialized replacement mount designed to expand the versatility of your URSA Mini Pro camera. This mount allows you to utilize high-quality ENG-style B4 mount HD lenses, which are commonly used in broadcast and television production. It features a professional locking lever to securely engage the lens, and the included shim kit ensures you can achieve a precise flange focal distance during installation for perfect focus accuracy across the zoom range.

A key technical advantage of this mount is its integrated corrective optics. Because B4 lenses are traditionally designed for three-sensor cameras with a prism, they can suffer from optical degradation when used on a single-sensor camera; however, this mount's spherical-aberration correction compensates for this difference. This allows you to use your existing broadcast glass on the URSA Mini Pro’s modern sensor without sacrificing image quality, making it an ideal solution for sports, news, and studio environments.

Product Features in Detail

Integrated Corrective Optics

Standard B4 lenses are designed for cameras that use a three-sensor prism block, which can cause color fringing and softness when used on a single-sensor camera. This mount features custom-designed integrated glass elements that correct the light path, ensuring your broadcast lenses perform with stunning clarity on the URSA Mini Pro’s single large sensor.

Spherical-Aberration Correction

The precision optics within the mount are specifically tuned to compensate for spherical aberrations. This ensures that even when shooting with wide-open apertures on older ENG lenses, the image remains sharp and free from the "glow" or haziness typically seen when adapting broadcast glass to digital cinema sensors.

Professional B4 Locking Mechanism

Designed for the fast-paced world of live production, the mount features a heavy-duty locking lever interface. This industry-standard "breech-lock" design allows you to securely mount large, heavy zoom lenses with confidence, providing a rigid connection that eliminates any lens play or movement during operation.

Precision Flange Distance Shimming

To ensure your lens maintains "parfocal" performance—staying in focus throughout the entire zoom range—the mount includes a complete shim kit. These precision-cut spacers allow you to fine-tune the distance between the lens and the sensor, compensating for manufacturing tolerances and ensuring perfect optical alignment.

Native ENG Lens Control

When paired with the URSA Mini Pro, this mount facilitates communication with the lens’s servo grip. This allows the camera to power the lens and provides the operator with control over the iris and record start/stop functions directly from the camera’s buttons or remote broadcast controllers.

Broadcast Workflow Integration

By enabling the use of B4 lenses, this mount transforms the URSA Mini Pro into a powerful ENG or studio camera. It allows production teams to leverage the massive 20x or 40x zoom ranges common in broadcast glass, which is essential for sports and live events where cinema-style prime lenses are impractical.