Macro lens system

Details Macro lens system Macro lens system

1989-02-23

1990-05-08

Sugarman, Scott J.

G02B 964

Patent

active

049232924

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.

REFERENCES:
patent: 4772108 (1988-09-01), Sugiyama
patent: 4792219 (1988-12-01), Mihara

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