Extending attachment lens

Details Extending attachment lens Extending attachment lens

1977-05-27

1978-12-12

Clark, Conrad J.

350216, 350220, G02B 934, G02B 960

Patent

active

041293592

ABSTRACT:
An objective system including a prime lens objective followed by a negative attachment which consists of a negative doublet of a biconvex lens cemented together with a biconcave lens, a biconvex lens, a middle biconcave lens followed after an axial air space by a biconvex lens and a biconcave lens. The middle biconcave lens has a front surface smaller in radius of curvature than that of a rear surface thereof. The present invention is to provide for an increased axial separation between the front principal point of the attachment and the focal point of the prime lens objective while improving field curvature of image.

REFERENCES:
patent: 1168873 (1916-01-01), Florian
patent: 3441338 (1969-04-01), Johnson

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