Variable magnification optical system, optical apparatus...

Details Variable magnification optical system, optical apparatus... Variable magnification optical system, optical apparatus...

2009-01-30

2011-12-20

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

08081390

ABSTRACT:
A variable magnification optical system ZL has, in order from the object side, a first lens unit G1with a positive refractive power, a second lens unit G2with a negative refractive power, a third lens unit G3with a positive refractive power, a fourth lens unit G4, and a fifth lens unit G5with a positive refractive power, and is configured to satisfy conditions of the following expressions:in-line-formulae description="In-line Formulae" end="lead"?2.49<|f4|/f5<4.69; andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.05≦β5w<0.085,in-line-formulae description="In-line Formulae" end="tail"?where f4is a focal length of the fourth lens unit, f5is a focal length of the fifth lens unit, and β5w is a lateral magnification of the fifth lens unit in the wide-angle end state.

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