Did you ever get back a fresh batch of film, only to be disappointed in finding out that you got back wash-out boring images. The problem is that you didn’t expose your film properly.
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Whether we use a digital or film camera, we need to be able to calculate exposure properly. But first, we need to understand how the aperture and the shutter work together. We also need to know how film handles light, and the relationship between film light sensitivity and f/stops.
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Lets take a quick look at the main elements.
Aperture and f/stops: the aperture is an opening in the centre of the lens through which light passes. The amount of light which passes through an aperture is indicated by f/stops. The lower the f/stop the more light that passes through the aperture. Opening up one full f/stop doubles the amount of light entering the camera. F/4 admits twice the light of f5.6.
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- Shutter: the shutter is a mechanical device that controls the length of time that light is allowed to act on the film. Each time you open the shutter by one, we double the light, when we close down the light by one we half the light. Opening the shutter at 1 second allows twice the light as that of a ½ second.