1980-04-11
1983-01-11
McGraw, Vincent P.
G02B 1322
Patent
active
043679285
ABSTRACT:
A wide angle attachment adapted to be used with a prime lens. The lens comprises four elements in three groups. The combination of the attachment with a prime lens results in a lens system having a larger field of view than the field of view of the prime lens by itself.
REFERENCES:
patent: 3152211 (1964-10-01), Cox et al.
patent: 4269474 (1981-05-01), Kamimura
Chen Muh-fa
Kreitzer Melvyn H.
McGraw Vincent P.
Vivitar Corporation
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