Lens system with fill-in lens

Details Lens system with fill-in lens Lens system with fill-in lens

1981-08-27

1983-07-19

Corbin, John K.

350464, 350475, G02B 962, G02B 1502

Patent

active

043940714

ABSTRACT:
A lens system having a main photo-taking lens with a fill-in lens detachably set in between the main photo-taking lens and the image plane to change the focal length of the entire system. This fill-in lens has, from front to rear, a positive 1st lens element, a negative 2nd lens element and a positive 3rd lens element. The glass of the positive 1st lens element and the lens form and glass of the positive 3rd lens element are properly chosen to minimize the bulk and size, while still achieving improvements of the image quality.

REFERENCES:
patent: 3741621 (1973-06-01), McCrobie
patent: 4206971 (1980-06-01), Hamanishi et al.

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