Definition: A lens with an extremely wide angle of view (as much as 180°) and considerable barrel distortion (straight lines at the edges of a scene appear-pear to curve around the center of the image).
Definition: extreme wide-angle lens with an angle of view exceeding 100° and sometimes in excess of 180°. Depth of field is practically infinite and focusing is not required.
Definition: extreme wide-angle lens with an angle of view exceeding 100° and sometimes in excess of 180°. Depth of field is practically infinite and focusing is not required.
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