Small retro-focus wide angle photographic lens system

Details Small retro-focus wide angle photographic lens system Small retro-focus wide angle photographic lens system

1977-07-28

1979-03-13

Sacher, Paul A.

350176, 350177, G02B 964

Patent

active

041439457

ABSTRACT:
A retro-focus wide angle photographic lens system comprises a front lens group including first and third negative meniscus lenses each having one surface greater in curvature than the other and oriented toward an image, and a second positive lens, and a rear lens group including a fourth positive lens, a fifth negative lens, and sixth and seventh positive lenses each having one surface greater in curvature than the other and oriented toward the image. The various lens system parameters are selected within the limits of and to satisfy a plurality of mathematical expressions, in order to optimize miniaturization while still retaining satisfactory optical characteristics.

REFERENCES:
patent: 3740120 (1973-06-01), Ruhl
patent: 4018511 (1977-04-01), Takahashi
patent: 4019810 (1977-04-01), Sugiyama

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