A film is a basic tool for recording images in a camera. It is a flexible, transparent base, coated with light-sensitive emulsion containing silver halide crystals. When a black-and-white film is processed, silver halide crystals which had been exposed to light get reduced to black particles of silver and form a permanent negative image. The unexposed crystals of silver halide are then chemically removed at the end of the process and the film is dried. The final processed image is no longer light sensitive and can be printed on a black-and-white paper.
[...] Choice of the film is dependent on what is in the mind of the camera user. Slower films offer superfine grain and large enlargements but higher-speed films allow us to stop the action and take photographs in dim light without flash. One has to decide what one really wants. Exposure control in the Camera Two mechanical devices in the camera control the amount of exposure on the film. First is the shutter speed which determines how long the shutter will remain open to admit light in the camera and second is the aperture control which decides on the quantity of light allowed to pass the film. [...]
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