Zoom lens system and image pickup apparatus having the same

Details Zoom lens system and image pickup apparatus having the same Zoom lens system and image pickup apparatus having the same

2006-11-21

2006-11-21

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S688000

Reexamination Certificate

active

07139131

ABSTRACT:
A zoom lens system capable of correcting a secondary spectrum is disclosed. The zoom lens system includes a first lens unit with a positive optical power, a second lens unit with a negative optical power, an aperture stop, and a rear lens component including at least one lens unit in an order from an object side to an image side. In the zoom lens system, during zooming from a wide angle end to a telephoto end, an interval between the first lens unit and the second lens unit increases, and an interval between the second lens unit and the aperture stop decreases. Then, a material satisfying the following conditions:in-line-formulae description="In-line Formulae" end="lead"?νd1n<35in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?θgF1n <−0.0027νd1n+0.680in-line-formulae description="In-line Formulae" end="tail"?is used for the negative lens in the first lens unit. Herein, νd1nrepresents an Abbe number, and θgF1nrepresents a partial dispersion ratio.

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English Translation of Japanese Patent Publication No. 06-043363.
English Translation of Japanese Patent Publication No. 07-013079.
English Translation of Japanese Patent Publication No. 08-248317.

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