Asked by baidshryans | 17th Dec, 2008, 11:11: AM

Expert Answer:

Shutter speed is the common term for exposure time, the effective length of time a shutter is open; the total exposure is proportional to this exposure time, or duration of light  reaching the film or imag sensor.

Factors that affect the total exposure of a photograph include the scene luminance, the aperture size (f-number), and the exposure time (shutter speed). We can trade off shutter speed and aperture by using units of stops. A stop up and down on each will halve or double the amount of light regulated by each; exposures of equal exposure value can be easily calculated and selected. For any given total exposure, or exposure value, a fast shutter speed requires a larger aperture (smaller f-number). Similarly, a slow shutter speed, a longer length of time, can be compensated by a smaller aperture (larger f-number).

Answered by  | 17th Dec, 2008, 02:56: PM

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