Zoom lens and camera having the same
First Claim
1. A zoom lens system comprising, in order from the front to the rear:
- a first lens unit of positive optical power;
a second lens unit of negative optical power; and
a following lens component of positive optical power as a whole;
wherein the first lens unit moves during zooming so that the interval between the first lens unit and the second lens unit may become great at the telephoto end relative to the wide angle end, at least one of the first lens unit, the second lens unit and lens units included in the succeeding lens component moves for focusing resulting from a change in an object distance, and the at least one lens unit moving for the focusing has at least one diffractive optical surface.
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Accused Products
Abstract
This specification discloses a zoom lens having good optical performance over the whole of an object distance from an infinity object to a super-close range object. This zoom lens system comprises, in order from the front to the rear, a first lens unit of positive optical power, a second lens unit of negative optical power, and a following lens component of positive optical power as a whole. During zooming, the first lens unit moves so that the interval between the first lens unit and the second lens unit may become great at the telephoto end relative to the wide angle end. At least one lens unit moves for focusing resulting from a change in an object distance, and the lens unit moving for the focusing is provided with a diffractive optical surface.
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Citations
9 Claims
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1. A zoom lens system comprising, in order from the front to the rear:
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a first lens unit of positive optical power;
a second lens unit of negative optical power; and
a following lens component of positive optical power as a whole;
wherein the first lens unit moves during zooming so that the interval between the first lens unit and the second lens unit may become great at the telephoto end relative to the wide angle end, at least one of the first lens unit, the second lens unit and lens units included in the succeeding lens component moves for focusing resulting from a change in an object distance, and the at least one lens unit moving for the focusing has at least one diffractive optical surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification