Zoom optical system, optical instrument incorporating the...

Details Zoom optical system, optical instrument incorporating the... Zoom optical system, optical instrument incorporating the...

2008-12-23

2010-11-23

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

07839577

ABSTRACT:
A zoom optical system has a first lens group having a positive refracting power; a second lens group having a negative refracting power; a third lens group having a positive refracting power; a fourth lens group having a negative refracting power; and a fifth lens group having a positive refracting power, in the order from the object side. The fourth lens group is composed of a cemented lens of a negative lens and a positive lens in the order from the object side, and a condition of the following expression is satisfied: νp>30.0, where νp is an Abbe number of the positive lens.

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