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Silent Wave Motor

The Nikon Silent Wave Motor uses ultrasonic traveling waves, converted to rotational energy, to focus AF-S NIKKOR lenses. The ultrasonic waves, moving in a spiral pattern inside the lens barrel, drive the cylindrical motor that moves the lens elements. This powerful and responsive high-torque motor system provides instant startup, high-speed autofocusing and incredible accuracy.

The Silent Wave Motor represents a significant advance in AF lens technology. Conventional autofocus lenses are driven by a motor in the camera linked to the lens by a gear system. Using inaudible ultrasonic frequencies—in effect, ultrasonic vibrations—rather than a gear system results in incredibly smooth, silent and precise AF operation.