PORTABLE PHOTOGRAPHIC LENS Russian patent published in 1995 - IPC

FIELD: small-sized photocameras. SUBSTANCE: small-sized photographic lens has to be four-component system. The first component of the system is positive meniscus 1 turned with its convex surface to field of objects. The second component is biconcave lens 2, the third one is biconvex lens 3 and the fourth component is negative meniscus 4 turned with its convex surface to the field of objects. Focal length of the objective is equal to f′, focal length of the first component is equal to , radiuses of the first surface satisfy conditions of (1)-(3): , 0,7f′<r₇<1,5f′ (2),, . When relations 1-3 are satisfied, high image quality is provided through the whole frame at increment of angular field of view of the objective till 2ω=67^°. Total length of the system may be reduced to 1,1 of f′,, lens part may be reduced to 0,40,4f′. EFFECT: reduced sizes of the system. 5 dwg