Zoom lens system, interchangeable lens apparatus and camera...

Details Zoom lens system, interchangeable lens apparatus and camera... Zoom lens system, interchangeable lens apparatus and camera...

2009-04-01

2011-11-29

Nguyen, Thong (Department: 2872)

Optical: systems and elements

Image stabilization

By movable refractive structure

C359S676000, C359S686000

Reexamination Certificate

active

08068281

ABSTRACT:
A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention, in order from an object side to an image side, comprises: a first lens unit having positive optical power; a second lens unit having negative optical power; and at least two subsequent lens units, wherein at the time of zooming, all lens units move in a direction along the optical axis so that intervals between the lens units vary, and at the time of focusing, a second most image-side lens unit moves in a direction along the optical axis.

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