Title:
【発明の名称】マクロレンズ
Document Type and Number:
Japanese Patent JP2594450
Kind Code:
B2
Abstract:
A photographic macro lens system can be composed of, in order from the object side, a first group of a retrofocus type and a second group with a floating mechanism being provided between the two groups. The first group has, in order from the object side, a negative meniscus lens having a convex surface directed toward the object, a positive lens having a surface of large curvature directed toward the object, a negative meniscus lens having a convex surface directed toward the object, a negative lens having a surface of large curvature directed toward the object across an aerial distance having a diaphragm stop, a positive lens having a surface of large curvature directed toward the image, and a positive lens. The second group has, in order from the object side, a negative lens element and a positive lens element. The macro lens system is compact and compensates for aberration over a wide shooting range from infinity to a life-size shot and can still be operated in a mechanically stable manner.
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Inventors:
Hirofumi Matsuo
Application Number:
JP4030388A
Publication Date:
March 26, 1997
Filing Date:
February 23, 1988
Export Citation:
Assignee:
Asahi Optical Co., Ltd.
International Classes:
G02B9/64; G02B13/24; (IPC1-7): G02B9/64; G02B13/24
Attorney, Agent or Firm:
Itami Tatsuo