Blackmagic URSA Mini Pro B4 Mount

This precision engineered mount brings professional broadcast versatility to a compact digital film platform. It has been developed to allow the use of high definition B4 broadcast lenses originally designed for multi sensor systems while maintaining image quality on a single sensor camera. By integrating carefully matched internal optics, it ensures that the transition from a multi sensor lens design to a unified sensor surface does not introduce unwanted softness or distortion. The optical assembly includes spherical aberration correction which preserves corner to corner clarity and enables the original performance characteristics of these lenses to be retained when used with modern digital film hardware. This results in a highly practical solution for productions that require the range, servo zoom control, and optical stability traditionally associated with broadcast style shooting.

The compact nature of the camera platform makes it well suited for handheld, shoulder based or rig mounted work in dynamic environments. Adding this mount extends its flexibility significantly because B4 lenses often feature powerful parfocal zoom ranges, deep depth of field characteristics and electronically controlled iris and zoom functions. These attributes are ideal for live production, sports, documentary and ENG style shooting where rapid reframing and continuous focus must occur seamlessly. The calibration and optic alignment are precisely tuned to the native sensor, ensuring consistent performance across its full resolution. This minimizes optical degradation and maintains accurate color reproduction, both of which are critical when matching footage across multiple cameras or lenses.

The mounting system uses a secure bayonet style interface with a locking ring that ensures a solid mechanical hold even under heavy lens loads. The physical design has been engineered to withstand frequent lens changes and maintain accurate backfocus stability. Included with the unit is a shim set that allows fine tuning of flange distance, which is essential for aligning parfocal zoom lenses so focus does not drift during zoom operations. Additional accessories such as protective covers and a molded case support safe storage and field transport. Once installed, operators benefit from the ability to control compatible B4 lenses through the camera’s standard twelve pin Hirose connection, enabling remote control of zoom, iris and record start functions.

The result is a rugged, optically optimized adapter that expands creative possibilities by merging classic broadcast practicality with the clarity and dynamic range of digital film capture.