Zoom Lens and Imaging Apparatus

摘要

The zoom lens is composed of: an object side lens group at least including, in order from an object side: a first lens group G1 having positive refractive power; and a second lens group G2 having negative refractive power; and an image focusing side lens group including, in order from the object side: a negative lens group A having negative refractive power; and a negative lens group B arranged by facing the negative lens group A across an air distance, having negative refractive power. In the zoom lens, focusing from infinity to a close object is achieved by moving just the negative lens group A toward an image focusing side to satisfy a conditional expression below:;[Expression 1];−1.80<β2t<−0.94  (1);(1−βAt2)×βBt2<−4.5  (2);where “β2t” is lateral magnification at a telephoto end of the second lens group in infinity focusing, “βAt” is lateral magnification at a telephoto end of the negative lens group A in infinity focusing, and “βBt” is lateral magnification at a telephoto end of the negative lens group B in infinity focusing.

主权项

1. A zoom lens composed of an object side lens group having positive refractive power and an image focusing side lens group having negative refractive power arranged in order from an object side: wherein,
the object side lens group at least including, in order from the object side: a first lens group having positive refractive power; and a second lens group having negative refractive power, the image focusing side lens group including, in order from the object side: a negative lens group A having negative refractive power; and a negative lens group B having negative refractive power arranged by facing the negative lens group A across an air distance, characterized in that focusing from infinity to a close object is achieved by moving just the negative lens group A toward an image focusing side and satisfy conditional expressions below:
[Expression 1]−1.80<β2t<−0.94  (1)(1−βAt2)×βBt2<−4.5  (2)Where
“β2t”: lateral magnification at a telephoto end of the second lens group in infinity focusing. “βAt”: lateral magnification at a telephoto end of the negative lens group A in infinity focusing. “βBt”: lateral magnification at a telephoto end of the negative lens group B in infinity focusing.