Blackmagicdesign URSA Cine Mount B4

Blackmagicdesign URSA Cine Mount B4

Dedicated B4 lens mount with spherical-aberration correction for the URSA Cine RGBW sensor

Mount B4 broadcast and box lenses directly to the URSA Cine RGBW sensor with custom optical matching. Built for camera operators using B4-mount glass on the Blackmagic URSA Cine camera system, this adapter applies built-in spherical-aberration correction to ensure precise focus across single-sensor setups.

When you set up for live sports in an outdoor stadium, your live production relies on the extensive zoom range of a heavy B4 box lens to track fast athletes across the field. You get the dynamic range and color science of the URSA Cine camera while keeping that reach. Securing this mount to your camera body bridges the gap between cinema optics and live broadcast. You maintain the familiar, precise zoom and focus mechanics of your broadcast glass while capturing native footage with optical alignment and zero vignetting.

Flawless Optical Matching for the URSA Cine RGBW Sensor Broadcast lenses project incoming light through a prism block onto three separate internal sensors

Attaching these lenses directly to a single large sensor creates optical flaws and softness. This mount integrates optical elements to eliminate that issue. Built-in spherical-aberration correction ensures the light path from your B4 lens resolves sharply across the URSA Cine RGBW sensor. You retain edge-to-edge sharpness, high contrast, and deep color fidelity without the blooming or optical softness of single-sensor adaptation. The internal optics compensate for the missing prism block, directing light onto the photosites at the precise angle required.

Enabling 4.6K 16:9 Workflows at up to 240 FPS Adapting broadcast lenses to a cinema-sized sensor requires exact image circle coverage. This mount enables a dedicated 4.6K B4 Crop mode directly on the camera body. Operating in a standard 16:9 aspect ratio, this crop matches the image circle of B4 lenses and eliminates mechanical vignetting or corner darkening from your feed. Using this crop unlocks high-frame-rate capabilities for your workflow. You capture fast action at up to 240 frames per second in 4.6K resolution.

For sports broadcasts and live events, your production team delivers smooth slow-motion replays without switching cameras or sacrificing your broadcast glass. The high resolution combined with fast frame rates gives you control over live slow-motion replay. Physical Integration of Box Lenses in Live Production The adapter withstands continuous demands in professional live environments, locking standard B4-mount broadcast or box lenses firmly to the camera body. Heavy broadcast lenses require rigid seating to maintain accurate back focus throughout long productions; this mount maintains precise mechanical tolerances under heavy loads. The connection remains rigid for shoulder-mounted compact ENG-style B4 lenses and large box lenses operated from the back of an arena.

To complete the electronic integration, this mount relies on the required Blackmagic URSA Cine B4 Adapter Cable. This cable passes power and lens control signals during operation. Bridging Cinema Hardware and Broadcast Workflows Expanding the URSA Cine into a broadcast workflow requires precise optical integration. By using this optical mount, you convert a large-format cinema camera into a full broadcast chain component. The custom optics ensure the RGBW sensor works directly with glass engineered for three-chip broadcast cameras.

You eliminate external optical adapters and digital scaling tricks in your switcher, maintaining a clean optical path from lens to sensor. This mount lets production teams and outside broadcast vans use their existing inventory of B4 broadcast lenses while upgrading camera bodies to modern sensor technology. URSA Cine Mount B4 Application and Selection Criteria Select this mount when attaching B4 broadcast or box lenses to an URSA Cine camera. It bridges the two systems when production relies on the extended zoom ranges and parfocal performance of B4 glass. Applications include broadcast production using B4 lenses on the URSA Cine camera in 4.6K B4 Crop 16:9 up to 240 FPS, as well as live events, sports coverage, and studio environments where ENG and box lenses are standard.

Note that full communication and lens control require the complementary Blackmagic URSA Cine B4 Adapter Cable. Shooters using exclusively standard PL or EF cinema lenses do not require this adapter. URSA Cine Mount B4 Technical Capabilities