High power photographic objective with large angular field

Details High power photographic objective with large angular field High power photographic objective with large angular field

1974-11-25

1976-05-25

Sacher, Paul A.

350176, 350207, 350214, G02B 304, G02B 964

Patent

active

039588645

ABSTRACT:
A high power lens for photograhic purposes, having a relatively large angular field. The lens has at least seven air spaced members, at least three of which are behind a central vertex space, those members in front of such space being divided into two groups of at least two members in each group, the front member in each of these two groups having both its front surface and its rear surface convex toward the front or object side. In the rear group behind the central vertex space, there is a negative member followed by two positive or collecting members, the first such positive member being separated from the negative member by an air lens of diverging action. Specific conditional data are given for several examples or embodiments of the invention.

REFERENCES:
patent: 3870402 (1975-03-01), Takahashi

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