|Richards, Verascope - Waterhouse Stops 2|
10. Exposure is controlled by varying the shutter speed, aperture setting or both.
This lever controls the aperture (or diaphragm) and is one of two levers. Lever (10) controls a strip of metal with two holes pressed in it, called Waterhouse stops. Two apertures are available from this lever, wide open (f/4.5) and f/8.
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