Conversion lens releasably attached behind master lens

Details Conversion lens releasably attached behind master lens Conversion lens releasably attached behind master lens

1986-08-20

1988-09-13

Corbin, John K.

350432, 350481, G02B 1502, G02B 1318, G02B 910

Patent

active

047705086

ABSTRACT:
A conversion lens for attachment to the rear of a master lens to increase the focal length of the entire system, includes a positive lens, and a negative lens positioned on the image side of the positive lens, wherein at least one of the lens surfaces of the positive lens and the negative lens is an aspherical surface.

REFERENCES:
patent: 4443067 (1984-04-01), Owen, Jr. et al.
patent: 4477154 (1984-10-01), Sato

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