ZOOM LENS SYSTEM, IMAGING DEVICE AND CAMERA

摘要

A zoom lens system includes a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, a fourth lens unit having negative optical power, and a fifth lens unit having positive optical power. A condition of 18.5

主权项

1. A zoom lens system, in order from an object side to an image side, comprising:
a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power; a fourth lens unit having negative optical power; and a fifth lens unit having positive optical power, wherein in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit, the second lens unit, and the third lens unit move along an optical axis so that an interval between the first lens unit and the second lens unit at the telephoto limit becomes larger than that at the wide-angle limit, and an interval between the second lens unit and the third lens unit at the telephoto limit becomes narrower than that at the wide-angle limit, an aperture diaphragm is disposed between the second lens unit and the third lens unit, and the following conditions (1) and (3) are satisfied:
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