Title:
大口径ズームレンズ
Document Type and Number:
Japanese Patent JP7053018
Kind Code:
B2
Abstract:
To provide a large-aperture zoom lens which offers good optical performance by reducing aberration variations associated with zooming, has a zoom ratio of approximately 3x and a focal length of approximately 200 mm at the telephoto end, and is equipped with an anti-shake function.SOLUTION: A large-aperture zoom lens provided herein comprises a lens group L1 with positive refractive power disposed on the most object side, a lens group Ln with negative refractive power disposed on the image side of the lens group L1, a lens group Lp with positive refractive power disposed on the image side of the lens group Ln, a lens group Lm with positive refractive power disposed on the most image side, and an aperture stop S disposed near the lens group Lm, and is configured such that the lens group L1 and the lens group Lm are stationary relative to an image plane and the lens group Ln and the lens group Lp move to change a distance to respective adjacent lens groups along an optical axis when zooming from the wide-angle end to the telephoto end.SELECTED DRAWING: Figure 1
Inventors:
Murakami Hitoshi
Application Number:
JP2018082481A
Publication Date:
April 12, 2022
Filing Date:
April 23, 2018
Export Citation:
Assignee:
Sigma Co., Ltd.
International Classes:
G02B15/20
Domestic Patent References:
| JP2002162564A | ||||
| JP200390958A | ||||
| JP201435480A | ||||
| JP2013221976A | ||||
| JP201612119A | ||||
| JP2009156893A | ||||
| JP2009198656A |
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