Photographic lens system

Details Photographic lens system Photographic lens system

1978-09-28

1981-04-28

Clark, Conrad J.

G02B 960

Patent

active

042641381

ABSTRACT:
A photographic lens system having five lens components in which separation of a cemented lens of the second lens component of the Biometer type lens system has enabled making an aperture ratio of F/2.0, a long back focus and effective correction of various aberrations. The system comprises five lens components and five lens elements comprising a first lens component having a positive meniscus lens, a second lens component having positive meniscus lens, a third lens component having a negative meniscus lens, a fourth lens component having a negative meniscus lens and fifth lens component having a positive meniscus lens.

REFERENCES:
patent: 2720139 (1955-10-01), Tronnier
patent: 4045127 (1977-08-01), Matsubara
patent: 4106854 (1978-09-01), Fuji

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