1981-11-04
1985-01-08
Corbin, John K.
350427, G02B 1514, G02B 1518
Patent
active
044924372
ABSTRACT:
A zoom lens system with an improved focusing system is provided. The zoom lens system comprises, from the object to the image side, a front lens group, a zooming lens group including at least a movable lens group, and a macroscopically fixed rear lens group including an aperture stop located inclining towards the object side and a focusing lens group movable on the image side of the aperture stop, wherein the lens system fulfills the following condition: ##EQU1## wherein, f.sub.F represents the focal length of the focusing lens group in the rear lens group, f.sub.III represents the focal length of the whole rear lens group upon infinity focusing, and .gamma. represents the zoom ratio of the zoom lens system.
REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4045128 (1977-08-01), Momiyama
patent: 4068929 (1978-01-01), Yokota
Betensky et al., "Continuous Close Focusing Telephoto Zoom Lenses", SPIE, vol. 237, 1980 Intl. Lens Design Conf., pp. 488-496.
Masumoto Hisayuki
Shimomura Masaichi
Corbin John K.
Minolta Camera Kabushiki Kaisha
Sugarman Scott J.
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