Retrofocus wide angle lens system

Details Retrofocus wide angle lens system Retrofocus wide angle lens system

1975-05-08

1976-09-21

Corbin, John K.

G01B 964

Patent

active

039815633

ABSTRACT:
A retrofocus wide angle lens system provides an increased field angle with a large aperture ratio. Besides the specific arrangement of the individual lens components in the various embodiments of the present invention, the retrofocus wide angle lens design further satisfies the following conditions: ##EQU1## WHEREIN R IS THE RADII OF CURVATURES FOR THE SUCCESSIVE LENS SURFACES FROM THE OBJECT TO IMAGE SIDE OF THE LENS SYSTEM; N.sub.I and N.sub.II represent the refractive indices of lenses forming a cemented doublet on the image side of the diaphragm; R represents the common radius of curvature of an intermediate surface of the doublet and f represents the overall focal length of the lens system.

REFERENCES:
patent: 3856386 (1974-12-01), Fujioka
patent: 3877795 (1975-04-01), Yamashita
patent: 3884556 (1975-05-01), Nakagawa

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