Patent ID: 9575295
Date: 2017-02-21
CPC Classifications: G02B

Claim:
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: 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: 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.