Detachable close-up lens assembly for an adjustable focus lens c

Details Detachable close-up lens assembly for an adjustable focus lens c Detachable close-up lens assembly for an adjustable focus lens c

1992-12-28

1994-02-22

Gellner, Michael L.

354295, G03B 1320

Patent

active

052892204

ABSTRACT:
An attachment is mounted on an adjustable focus lens camera which attachment incorporates a second lens system to operate in combination with the camera lens system to allow close-up photography. The attachment further incorporates a ranging system to insure that the subject of the photograph is in proper focus by using converging light beams from said attachment as a focus indicator.

REFERENCES:
patent: D279574 (1985-01-01), Conner et al.
patent: 2379698 (1945-07-01), Fischer
patent: 3416426 (1968-07-01), Land
patent: 3882517 (1975-05-01), Land et al.
patent: 4291965 (1981-03-01), Johnson et al.
Polaroid Corporation, OEM Product Catalog (1991-1992), "Instant Imaging Systems".

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