DISTORTION IMAGE ATTACHMENT LENS

摘要

PURPOSE:To obtain a lens through which a unidirectional image is reduced and magnified, by causing 5-20% variable magnification in a specific direction of an image for a pair of cylindrical lenses constituting substantially a nonfocal system. CONSTITUTION:A biconcave cylindrical lens L1 and a biconvex cylindrical lens L2 form a substantically nonfocal system. Such paired lens system is attached to the barrel of an ordinary photographing lens L3. For this lens system, the deformation ratio on the approximate axis is 0.8-0.95 and the lens distance between the L1 and L2 is 0.4-0.6 times as much as the total length of lens. The lenses L1 and L2 are formed in rectangles at the center part of a synthetic resin of acrylic or other materials and attached to a lens barrels 2. An end 3 of the barrel 2 is attached to a photographing lens, and the barrel is turned. Thus a subject is reduced vartically or horizontally to produce a new photographic image.