Rear-attachment lens system

Details Rear-attachment lens system Rear-attachment lens system

1987-04-03

1988-05-10

Corbin, John K.

G02B 1510, G02B 914

Patent

active

047431016

ABSTRACT:
A rear attachment lens mounted between a master lens and an image plane for increasing the composite focal length. It consists of four lenses. The first lens is negative and has a concave surface on the image side. The second lens is positive, convex on both sides and cemented to the first lens. The third lens is negative and is concave towards the master lens. The fourth lens is positive, convex towards the master lens and has at least one aspherical surface. Preferably five numerical conditions on magnification, refractive indices, radius of curvature and asphericity are satisfied.

REFERENCES:
patent: 4591234 (1986-05-01), Hamanishi

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