than 24 mm.

Common wide-angle lenses for a full-frame 35 mm camera are 35, 28, 24, 21, 20, 18, and 14 mm, the latter four being ultra-wide.Many of the lenses in this range will produce a more or less rectilinear image at the film plane, though some degree of barrel distortion is not uncommon.

Ultra wide-angle lenses that do not produce a rectilinear image (i.e., exhibit

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