Zoom lens and imaging apparatus

摘要

A zoom lens includes, in order from the object side, a positive first group, a negative second group, a stop, a positive third group, a negative fourth group, and a positive fifth group. During magnification change from the wide-angle end to the telephoto end, the first to fourth groups are moved to always increase the distance between the first and second groups, always decrease the distance between the second and third groups, and change the distance between the third and fourth groups and the distance between the fourth and fifth groups. The third group includes, in order from the object side, at least a positive lens, a positive lens, a negative lens, and a positive lens, and satisfies condition expression (1) below:
25<νdD−νdA<70  (1),
where νdA and νdD are Abbe numbers at the d-line of the most object-side lens A and the most image-side lens D.

主权项

1. A zoom lens consisting of, in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a stop, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a fifth lens group having a positive refractive power,
wherein, during magnification change from a wide-angle end to a telephoto end, at least the first to the fourth lens groups are moved such that a distance between the first lens group and the second lens group always increases, a distance between the second lens group and the third lens group always decreases, and a distance between the third lens group and the fourth lens group and a distance between the fourth lens group and the fifth lens group are changed, the first lens group consists of, in order from the object side, a meniscus lens having a negative refractive power with a concave surface toward an image side, a lens having a positive refractive power, and a lens having a positive refractive power, the third lens group includes at least four lenses including a lens A having a positive refractive power disposed at the most object-side position, a lens B having a positive refractive power disposed next to and on the image side of the lens A, a lens C having a negative refractive power with a concave surface toward the image side, the lens C being disposed next to and on the image side of the lens B, and a lens D having a positive refractive power and disposed at the most image-side position, and the condition expression (1) below is satisfied:
25<νdD−νdA<70  (1), where νdA is an Abbe number with respect to the d-line of the lens A, and νdD is an Abbe number with respect to the d-line of the lens D, and wherein the condition expression (3) below is satisfied:
35<νdB−νdA<70  (3), where νdA is an Abbe number with respect to the d-line of the lens A, and νdB is an Abbe number with respect to the d-line of the lens B.