Blackmagic Design URSA Mini Pro EF Mount

Blackmagic Design URSA Mini Pro EF Mount

The Blackmagic Design URSA Mini Pro EF Mount is a precision-engineered lens mount that allows you to use high-quality Canon EF-mount photographic and cinema lenses on your URSA Mini Pro. While the URSA Mini Pro 4.6K G2 typically ships with this mount pre-installed, this standalone kit serves as a replacement or an upgrade for users of the URSA Mini Pro 12K (which ships with a PL mount).

In 2026, the EF mount remains the most popular choice for independent filmmakers and content creators due to the massive availability of affordable, high-performance glass from Canon, Sigma, Tamron, and Zeiss.

Core Functionality

• Active Electronic Connection: The mount features integrated electronic contact pins that facilitate communication between the camera and the lens. This enables:

   

  • Electronic Iris Control: Adjust your aperture directly via the camera’s touchscreen, physical dials, or remotely via an ATEM switcher.

     

  • Lens Metadata: Automatically records lens information (focal length, aperture, and brand) directly into the Blackmagic RAW or ProRes metadata for use in post-production.

  • Image Stabilization: Powers and supports the internal "Image Stabilization" (IS) found in many EF lenses.

  • Push Autofocus: Supports the camera's "Focus" button to trigger auto-focus on compatible electronic lenses.

     

• Precision Shimming: The kit includes a comprehensive Shim Set, allowing you to fine-tune the flange focal distance. This ensures that the distance scales on your lenses are accurate and that zoom lenses remain "parfocal" (staying in focus while zooming).

   

Key Features

• User-Interchangeable: Designed to be swapped in minutes. It is secured by four high-strength screws on the front of the URSA Mini Pro chassis, requiring no specialized technician for installation.

   

• Robust Build Quality: Constructed from chrome-plated stainless steel, the mount is built to withstand the torque and weight of heavy L-series telephoto or cinema-modified EF lenses.

• Light Baffle: Includes a specialized internal baffle that prevents light scatter and reflections within the mount, ensuring maximum image contrast and reducing flare.

What’s Included in the Box?

• 1 x Blackmagic URSA Mini Pro EF Mount

• 1 x Shim Set (various thicknesses for precise calibration)

   

• 1 x Baffle Tool (for safe installation of the light baffle)

• 1 x Set of Spare Mounting Screws

   

• 1 x Moulded Mount Case (for safe storage of your spare PL or F mount)

   

• Printed Instructions

Technical Specifications

Operational Insight (2026)

In 2026, the EF mount is the "Swiss Army Knife" for the URSA line. It is particularly valued by users of the URSA Mini Pro 12K who want to utilize the resolving power of high-end EF prime lenses without the extreme cost of PL cinema glass.

Pro Tip: If you notice that your lens focus marks don't match the actual focus (especially on wide-angle lenses), take the time to use the included Shim Set. Adding or removing even a single thin shim can drastically improve the sharpness and accuracy of your lens's focus throw.