Zoom Lens System, Interchangeable Lens Apparatus and Camera System
First Claim
1. A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, whereinthe first lens unit moves along an optical axis, and the fourth lens unit is fixed relative to an image surface, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, andthe following condition (1) is satisfied:
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0.8<
fI/fW|<
1.4
(1)wherefI is a composite focal length of the first lens unit, andfW is a focal length of the entire system at a wide-angle limit.
1 Assignment
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Accused Products
Abstract
A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, wherein the first lens unit moves along an optical axis, and the fourth lens unit is fixed relative to an image surface, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, and the condition: 0.8<|fI/fW|<1.4 (fI: a composite focal length of the first lens unit, fW: a focal length of the entire system at a wide-angle limit) is satisfied; an interchangeable lens apparatus; and a camera system are provided.
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Citations
6 Claims
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1. A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, wherein
the first lens unit moves along an optical axis, and the fourth lens unit is fixed relative to an image surface, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, and the following condition (1) is satisfied: -
0.8<
fI/fW|<
1.4
(1)where fI is a composite focal length of the first lens unit, and fW is a focal length of the entire system at a wide-angle limit. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification