Compact retrofocus wide angle objective

Details Compact retrofocus wide angle objective Compact retrofocus wide angle objective

1978-05-17

1979-12-04

Sacher, Paul A.

350176, G02B 964

Patent

active

041769147

ABSTRACT:
A wide angle objective lens with an angular field coverage of 76.degree. and a relative aperture of 1:2.8, comprising seven members of which the first and second (counting from the front) are negative meniscuses of forward convexity, the third is positive with the front surface more strongly curved than the rear one and convex toward the front, the fourth is bi-convex, the fifth is bi-concave, and the sixth and seventh are positive meniscuses of rearward convexity. This lens is shortened in the longitudinal direction and the diameter of the first member is smaller. By the shortening of the dimensions of the lens, it is increasing in the halo due to the sagittal rays. In order to diminish the increased halo it is restricted optimumly the reduced air space between the second and fourth members which affects the incident height of the marginal ray on the fourth member.

REFERENCES:
patent: 3874770 (1975-04-01), Shimizu
patent: 4046459 (1977-09-01), Kawamura

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