Macro lens system

Details Macro lens system Macro lens system

1998-12-04

2000-07-18

Perkey, W. B.

Photography

Exposure control system responsive to distance

396505, G03B 700

Patent

active

060919035

ABSTRACT:
A macro lens system includes a positive first lens group, an aperture and a negative second lens group arranged in the order from an object side. The lens groups are driven to move along an optical axis for focusing. When the lens groups are driven, a full-opening diameter of the aperture is changed such when the lens groups is moved toward the object side to focus on a closer object, the full-opening diameter is increased.

REFERENCES:
patent: 4666260 (1987-05-01), Itoh
patent: 4772108 (1988-09-01), Sugiyama
patent: 4923292 (1990-05-01), Matsuo
patent: 4934790 (1990-06-01), Hohenecker
patent: 5331464 (1994-07-01), Ito et al.
patent: 5850577 (1998-12-01), Ito

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