Zoom lens and imaging apparatus

摘要

The zoom lens includes at least, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; a fourth lens group G4 having negative refractive power; and a fifth lens group G5 having negative refractive power. In the zoom lens, focusing from infinity to a proximity of object is achieved by movement of just fourth lens group toward an image focusing side and is characterized in Satisfaction of expressions below:
[Expression 1]2.1<βrt<3.5  (1)−1.80<β2t<−0.94  (2)
where “βrt” is composite lateral magnification at a telephoto end of lens groups locating closer to the image focusing side than the third lens group at infinity focusing, and “β2t” is lateral magnification at a telephoto end of the second lens group at infinity focusing.

主权项

1. A zoom lens at least including, in order from an object side:
a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group having negative refractive power,wherein focusing from infinity to a proximity of object is achieved by movement of just the fourth lens group toward an image focusing side and is characterized in Satisfaction of expressions below:
[Expression 1] 2.1<βrt<3.5  (1) −1.80<β2t<−0.94  (2) where “βrt” is composite lateral magnification at a telephoto end of lens groups locating closer to the image focusing side than the third lens group at infinity focusing, and “β2t” is lateral magnification at a telephoto end of the second lens group at infinity focusing.