Optical: systems and elements – Image stabilization – By movable refractive structure
Patent
1997-01-09
1998-10-20
Nguyen, Thong
Optical: systems and elements
Image stabilization
By movable refractive structure
359554, 359686, G02B 2764, G02B 1514
Patent
active
058255460
ABSTRACT:
Macro telephoto lenses are disclosed for photographic use and that have a vibration compensation. The lenses have a relatively long focal length (as telephoto lenses), having a field of view of about 18.degree. or less and an F number of at least 4. Focusing is from infinity to a reproduction ratio of at least 1/2 and preferably 1/1 or more. The vibration compensation feature comprises at least one "antivibration lens element" in a lens group that is stationary in the direction of the optical axis. The antivibration lens element is operable to be transversely moved relative to the optical axis to counteract the effect of vibration and/or lens movement during photography. The lens preferably comprises a first positive lens group, a second positive lens group, a third negative lens group, and a fourth positive lens group. The first and third lens groups are preferably movable on the optical axis during focusing, and the second and fourth lens groups are preferably stationary in the direction of the optical axis during focusing. The lens preferably fulfills several conditional expressions.
REFERENCES:
patent: 5249079 (1993-09-01), Omeda
patent: 5402268 (1995-03-01), Tatsuno
patent: 5477297 (1995-12-01), Suzuki
patent: 5490014 (1996-02-01), Suzuki
patent: 5585966 (1996-12-01), Suzuki
Nguyen Thong
Nikon Corporation
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