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Richards, Verascope - Waterhouse Stops

9. 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 (9) 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/6.3. It is important to note that for f/6.3 to be available the other waterhouse stop MUST be in the f/4.5 position - otherwise the smaller stop of the other lever (10) will be used and the picture will be underexposed.

 

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