The Fujinon CFH-3 is a high-precision manual focus control unit engineered for use with professional broadcast and cinema camera lenses, specifically designed to interface with Fujinon's series of high-performance box-style and portable field lenses. Its primary function is to provide camera operators and focus pullers with an ergonomic, tactile, and highly accurate means of controlling lens focus remotely from the camera body, enabling smooth and repeatable focus pulls. The unit connects to the lens's internal focus servo via a dedicated flexible drive cable, physically linking the control knob's rotation directly to the lens's focus mechanism. This direct mechanical connection ensures zero latency and delivers a tangible, organic feel that is highly valued for critical focus work, allowing the operator to develop muscle memory for specific focus marks.

The controller itself is built around a large, knurled metal focus knob mounted on a sturdy chassis designed for secure mounting on a tripod handle, camera shoulder rig, or other custom support. The knob's rotation is exceptionally smooth, with a carefully calibrated resistance that provides precise feedback. The CFH-3 often features a multi-turn design, meaning the knob must be rotated several times to move through the lens's entire focus range. This extended rotation vastly increases the granularity of control, allowing for minute adjustments that are impossible with a standard lens barrel, which is crucial for pulling focus on shallow depth-of-field shots with long focal lengths or large sensors.

The included flexible drive cable is a critical component, offering the flexibility to position the control unit away from the lens for optimal operator ergonomics while maintaining a positive, non-slip mechanical link. The system is purely manual and does not require external power, making it completely reliable and usable in any environment. By combining robust construction, a direct mechanical interface, and an ultra-precise multi-turn knob, the Fujinon CFH-3 transforms the challenging task of manual focus pulling into a controlled, repeatable process. It is an essential tool for cinematographers and broadcast operators who demand the utmost precision and tactile control over their lens's focus plane to achieve sharp, intentional, and artistic results.