The DSLR simply means digital single lens reflection. A DSLR camera is made of the body and lens. The main body is the machine that captures the imagine. The lens is the machine we use to alert the imagine we want. Different lens can make the imagine diverse. The wide angle lens can accentuate the imagine angle. Using a zoom lens will make the photographer be able to zoom in the imagine before exposure. There are several buttons on the shooting model dial, M, A, Tv and P. "PASM" dial, they typically provide as minimum Program, Aperture-priority, Shutter-priority, and full Manual modes.
The exposure generally refers a single shutter cycle. Usually the exposure will be automatic exposure is the total amount of light allowed to fall on the photographic medium (photographic film or imagine sensor) during the process of taking a photograph. There is a physics equation of exposure, H=Et. H stands luminous exposure. E stands image-plane illuminance. The t stands the time of exposure.
resource web: http://en.wikipedia.org/wiki/Exposure_(photography)
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