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Exposure is the total amount of light allowed to fall on a sensor or film during the taking of a photograph. This is determined by the exposure time (shutter speed) and amount of light admitted (lens aperture). Today, sensor/film sensitivity (ISO speed) is often also considered to be part of exposure.
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Why are these light trails large blobs of light instead of nice thin lines?
We all know that exposure is amount of light for a given time period. … This will also yield longer trails with shorter exposure times. …
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Why would you have a light meter chose your aperture for you?
The photographer first decides what aperture to use, a suitable ISO and exposure time. … The meter is then used to find a flash or lamp setting that is good for the aperture you selected at the selected ISO and exposure time. …