Pancratic wide-angle objective

Details Pancratic wide-angle objective Pancratic wide-angle objective

1974-02-14

1976-03-09

Corbin, John K.

350186, G02B 1500

Patent

active

039428745

ABSTRACT:
A pancratic wide-angle objective comprises a stationary negative front component in the form of a single meniscus with a convex forward surface, an axially movable intermediate component consisting of a biconvex lens, and a stationary multilens positive rear component separated from the front component by an airspace greater than the focal length of the latter. The individual focal lengths of the front, intermediate and rear components have absolute values in a ratio of approximately 4:5:3.

REFERENCES:
patent: 3597048 (1971-08-01), Bertele

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