Rear conversion lens

Details Rear conversion lens Rear conversion lens

1986-11-18

1988-09-06

Corbin, John K.

350422, G02B 1502, G02B 964

Patent

active

047688688

ABSTRACT:
A rear conversion lens to be mounted in between an objective lens and a determined image plane to produce a composite focal length longer than the focal length of the objective lens itself comprises, in the order from the object side a first lens component, a second lens component and a third lens component. The first lens component has a positive focal length and the image-side lens surface being convex toward the image side. The second lens component has a negative focal length and the object-side lens surface being convex toward the image side. The third lens component has a negative focal length and is in the shape of a meniscus convex toward the image side.

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

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