At Inter BEE 2025, Tilta presented the upcoming Nucleus Auto Focus Adapter, a lens mount accessory designed to enable autofocus on manual cinema lenses.
The adapter works with the Nucleus-M II Wireless Control System and uses the camera’s own phase-detection autofocus data to drive the motors. The first version is planned for Sony E-mount, with Canon RF and L-mount versions in development.
Lens Library and Calibration
The adapter contains a built-in database of pre-mapped lenses. Users select their lens from the internal menu, and the adapter automatically applies known mechanical parameters such as focus throw, minimum focus distance, and infinity position. New lens profiles are expected through firmware updates. Unlisted lenses can be calibrated manually.
Switching Between AF and Manual Control
Operators can switch between autofocus and manual adjustment using the Nucleus controller. Holding the button activates manual focus via the hand wheel, and releasing it returns control to autofocus. Tilta designed this feature to allow quick transitions during filming.
Autofocus Modes
Since the adapter relies on the camera’s AF system, it supports functions such as face detection and eye tracking. During demonstrations, the camera recognized and tracked multiple subjects with AF data transmitted to the Nucleus-M II motors.
Compatibility and Timeline
The initial release will support Sony E-mount. RF-mount and L-mount versions are planned, but no timelines were given. The demo setup used a PL lens attached to an E-mount camera.
Power and Solo-Shooter Setup
The system supports standard Nucleus power solutions, including NP-F batteries. Tilta also plans a simplified kit for single-operator use that includes the adapter and one motor.
Iris Data and Display
The adapter can transfer iris information to the Nucleus hand unit display, giving operators real-time aperture data even with fully manual lenses.
Anamorphic Lens Support
Some anamorphic lens profiles, including Atlas lenses, are already included. Tilta may expand this library, but the exact number of supported anamorphic lenses is not confirmed.
Performance Considerations
Real-world testing is still required to determine accuracy, speed, and reliability. Performance will depend on the autofocus capabilities of each camera body. The adapter works with Nucleus-M II motors, which offer fast response times, but autofocus requirements may challenge the system in fast-moving or low-contrast scenarios.
Tilta targets a price below $300 for the adapter and under $500 for the solo kit.
