Aperture Chatter

Put an AF-P lens on the D7500.

Put the camera in Still Live View mode.

Zoom the lens.

The lens "chatters" as the camera tries to keep the aperture at the same value. It's a very interesting noise, not at all like the way the old mechanical aperture lenses tend to sound in the same circumstance. 

In Video Live View you don't get the chatter, because the camera doesn't try to keep the aperture constant, it keeps the shutter speed constant.

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