Four-group telephoto zoom lens

Details Four-group telephoto zoom lens Four-group telephoto zoom lens

1984-03-27

1987-02-10

Corbin, John K.

G02B 15167

Patent

active

046419284

ABSTRACT:
A four-group telephoto zoom lens consists of, in succession from the object side, first group having a positive refracting power and movable on the optical axis of the lens for focusing, second group having a negative refracting power and movable on the optical axis for changing a composite focal distance of an entire system, a third group having a positive refracting power and movable on the optical axis for maintaining image plane at a fixed position and a fourth group as relay lens system having a positive refracting power. The second group consists of a first cemented negative lens component having, in the order from the object side, a positive lens and a negative lens cemented together and a second cemented negative lens component having a negative lens and a positive lens cemented together. The four-group telephoto zoom lens further satisfies a certain condition.

REFERENCES:
patent: 4223981 (1980-04-01), Mizutani et al.
patent: 4456341 (1984-06-01), Kato
patent: 4468096 (1984-08-01), Hamanishi
patent: 4468097 (1984-08-01), Hamanishi
patent: 4504125 (1985-03-01), Fujii

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