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As you increase the f-stop number (stopping down) by closing the diaphragm you decrease the light. The conventional f-stop scale on camera lenses results from the halving of the available light. For example, when you stop down from f/11 to f/16, you are decreasing the light by half...that would require halving the shutter speed to get the same exposure.

The standard f-stop scale on cameras goes:

f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128...

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13y ago

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