-Click-stops - lens aperture controls using a series of bearings that click audibly into place at each numbered setting.
Without click-stops to set your aperture, slight variations in dial position can represent as much as a 1/2-stop variance in exposure on either side of the marking, allowing for situations where a given exposure setting could differ by one full stop.
The large, legible shutter-speed dial atop the camera has click-stops at the “A' (aperture-priority auto-exposure) setting, and it’s possible to set intermediate shutter speeds in between all timed shutter speed settings— ...
 See also: Stops, Camera, View, Film, Box camera
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