1987-02-18
1987-10-27
Corbin, John K.
350423, G02B 1518
Patent
active
047025670
ABSTRACT:
A zoom lens having a component V which has at least one group of lens elements axially movable mainly for changing image magnification, a component C which has at least one group of lens elements axially movable for compensating for the image shift resulting from the change of image magnification to maintain the constant position of the image plane, and a compound component F positioned on the image side of either, or both, of said component V and said component C to be movable with zooming, and having a plurality of lens groups contributing to a small overall refractive power, whereby the focusing provision is made in at least one of the groups in said compound component F.
REFERENCES:
patent: 3286592 (1966-11-01), Wagner et al.
patent: 4054371 (1977-10-01), Yasukuni
Ikemori Keiji
Kato Masatake
Tanaka Kazuo
Tanaka Tsunefumi
Canon Kabushiki Kaisha
Corbin John K.
Dzierzynski P. M.
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