1985-10-08
1988-10-04
Corbin, John K.
G02B 1522, G02B 964
Patent
active
047752289
ABSTRACT:
A zoom lens whose first lens group, counting from front, has a negative refractive power and moves axially in differential relation to a following lens group to effect zooming, wherein the first lens group is constructed with a lens unit of negative power followed by another lens unit of positive power, whereby for focusing purposes, the negative lens unit is axially moved, while the positive lens unit is held stationary, to improve the stabilization of aberration correction throughout the entire focusing range.
REFERENCES:
patent: 3707324 (1972-12-01), Macher
Ikemori Keiji
Matsushita Takashi
Canon Kabushiki Kaisha
Corbin John K.
Gass Rebecca D.
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