1982-12-22
1985-05-07
Corbin, John K.
G02B 1516
Patent
active
045154465
ABSTRACT:
A zoom objective comprising four lens groups of which the first three lens groups counting from the object side are movable for zooming, whereby the refractive powers and the conditions of zooming movement of the aforesaid three lens groups are properly specified so as to improve the compactness while still maintaining good correction of aberrations.
REFERENCES:
patent: 4240700 (1980-12-01), Ogawa et al.
Asano Toshiaki
Minami Setsuo
Tajima Akira
Takahashi Sadatoshi
Tsuji Sadahiko
Canon Kabushiki Kaisha
Corbin John K.
Sugarman Scott J.
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