Five element photographic objective

Details Five element photographic objective Five element photographic objective

1978-09-19

1980-12-23

Sacher, Paul A.

G02B 934

Patent

active

042407052

ABSTRACT:
An objective of the expanded Tessar type is disclosed. Five elements form four components of which the first counting from the front is positive and convex toward the front, the second is a bi-concave lens, the third is a positive doublet consisting of a negative lens element and a bi-convex lens element cemented together at their adjoining surfaces, and the fourth is a bi-convex lens. The objective fulfills the following conditions: ##EQU1## wherein f is the focal length of the entire lens system; Ri is the radius of curvature of the i-th surface counting from the front; Di is the axial thickness of the i-th glass or air lens element; and Ni is the refractive index of the material of the i-th lens element.

REFERENCES:
patent: 1888156 (1932-11-01), Brelicke
patent: 3011401 (1961-12-01), Sandback

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