Clickless rings
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Clickless rings

All three rings on the 25-50mm feature a fine geared texture to them, allowing comfortable fingertip operation while also leaving open the option to use them with geared or motorized accessories.

This and the smoothly rotating aperture ring suggest Panasonic is primarily thinking about video with this lens. That said, while the smooth rotation allows near-stepless control over the aperture, the ring's large degree of rotation means it's easy to set the aperture value by hand without the risk of a small nudge knocking it to a significantly different f-number. Clicking the aperture ring over to 'A' either provides automatic control of aperture or passes aperture control off to a command dial on a camera body.

Panasonic describes the motor driving the aperture as a 'micro-step' drive, and the opening and closing of the aperture doesn't make the step changes visible.