Zoom lens system

Details Zoom lens system Zoom lens system

2007-12-11

2007-12-11

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

11223915

ABSTRACT:
A zoom lens system includes a negative first lens group, a positive second lens group, a diaphragm, a negative third lens group, and a positive fourth lens group, in this order from the object. The negative third lens group includes cemented lens elements having a positive lens element and a negative lens element. The positive fourth lens group includes a positive single lens element, and cemented lens elements having a positive lens element and a negative lens element, in this order from the object.

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English Language Abstract of JP 5-241073.
English Language Abstract of JP 7-261084.
English Language Abstract of JP 10-325923.
English Language Abstract of JP 2000-338397.
English Language Abstract of JP 2002-287031.
English Language Abstract of JP 2002-311330.

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