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Wide-Angle Lens

A lens that has a shorter focal length and a wider field of view (includes more subject area) than a normal lens.Also can explained as a lens whose focal length is shorter than the diagonal of the film frame; in 35mm photography, lenses shorter than 50mm; also referred to as a "short" lens.

WS

Watt per second. For flash mode, the measurement of electrical energy in the flash.