Title:
【発明の名称】近距離撮影可能なレンズ
Document Type and Number:
Japanese Patent JP2679130
Kind Code:
B2
Abstract:
A lens system capable of close-up photographing comprises, in succession from the object side, a first lens group having a positive refactive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power. The first lens group and the second lens group are moved relative from each other for focusing to infinity to a close distance so that the spacing between the first lens group and the second lens group is reduced and the spacing between the second lens group and the third lens group is enlarged. The first and second lens groups are designed to satisfy the following condition: 1.0< DELTA S2/ DELTA S1<1.4, where DELTA S1 is the amount of movement of the first lens group from the infinity photographing condition to a state in which an object at any distance is photographed, and DELTA S2 is the amount of movement of the second lens group from the infinity photographing condition to a state in which an object at any distance is photographed.
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Inventors:
Keiji Moriyama
Application Number:
JP17011888A
Publication Date:
November 19, 1997
Filing Date:
July 08, 1988
Export Citation:
Assignee:
NIKON CORPORATION
International Classes:
G02B9/64; G02B15/163; (IPC1-7): G02B9/64
Attorney, Agent or Firm:
Takao Watanabe