Basic lens for pancratic system

Details Basic lens for pancratic system Basic lens for pancratic system

1975-11-18

1977-09-27

Corbin, John K.

350219, G02B 1500

Patent

active

040507882

ABSTRACT:
A basic lens for a pancratic camera lens system having an afocal screen of variable enlargement in which the screen includes a primary, positive front component, second and third negative components, the total focal length of the second negative component being displaceable of the optical axis and the minimum focal length of the second negative element and the image field diagonal 2.sub.y having a relationship (f.sub.Gmin - f.sub.II)<6y, and a fourth positive component, the basic lens being constructed in the form of an assembly of six lenses including, in succession beginning with the lens facing the object to be photographed, a first biconvex lens, a second biconvex lens, a first biconcave lens cemented to the second biconvex lens, a second biconcave lens, a third biconvex lens and a positive meniscus, all arranged in aligned relationship in the direction of light incidence.

REFERENCES:
patent: 3891304 (1975-06-01), Muszumanski et al.
patent: 3937562 (1976-02-01), Muszumanski et al.

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