Ultimate power and speed
cforce MAX - the ARRI lens motor that combines exceptional speed and strength with intelligent onboard control. Compact and lightweight despite being so fast and powerful, it offers versatile mounting, easy setup and control, and total reliability in the most demanding shooting environments.
I have tested the cforce MAX in the hottest place on Earth, in jungles, and out on the open sea. Beyond its reliability, the responsiveness and speed genuinely allow me to do a better job, especially in documentary or free-flowing environments where I am constantly reacting to unexpected movement.
Georg Lanz
Focus Puller/Beta Tester
The motor is primarily designed for focus and zoom applications that require both high speed and high torque. This includes use with mechanically demanding lenses as well as fast focus and zoom movements.
Gear choice directly impacts speed and torque transmission. For high torque demand, a 40t gear achieves up to 320 teeth per second. The default 50t gear achieves up to 400 teeth per second.
The motor operates within a supply range of 10.5–34 V DC and has a maximum power consumption of 96 W.
Multiple motors can be connected in series via LBUS, typically up to three units in a daisy chain. Additional power is supplied via a separate cable connection from the motor to the battery using an LBUS-to-D-Tap cable. This is particularly recommended when the camera does not provide sufficient power via its LBUS or LCS port, such as in setups using the ARRI ALEXA Mini LF. In practice, additional power should be considered when using multiple motors or in high-load applications to ensure reliable calibration and performance.
The motor can be mounted to 15 mm or 19 mm support rods using the Clamp Console 2 or the Motor Rod Clamp MRC-1. Both clamps are mounted to the motor via a dovetail interface, allowing flexible configurations based on the focus puller’s preferences. The Motor Rod Clamp MRC-1 offers a key advantage through its high versatility, supporting a wide variety of rigging setups.
Calibration can be initiated via multiple control points. It can be performed using a handunit such as the ARRI Hi‑5, directly through the camera (e.g. ARRI ALEXA 35 or ALEXA 35 Xtreme), via a motor controller such as the ARRI RIA‑1, or directly on the motor itself. This flexibility ensures seamless integration into different on-set workflows.
Yes, the motor includes a Manual Calibration feature designed for very sensitive lenses. This allows controlled calibration to help prevent potential damage.
Yes, the motor can be operated under damp conditions, such as wet surfaces or when handled with wet fingers. It is designed for an operating temperature range of −20 °C to +50 °C and a relative humidity range of 0–95% (up to +45 °C). It is recommended to protect the motor and all associated components from excessive moisture.
