Patent ID: 9588322
Date: 2017-03-07
CPC Classifications: G02B

Claim:
1. A zoom lens comprising, in order from an object along an optical axis: a first lens group having negative refractive power; a second lens group having positive refractive power; and a third lens group having positive refractive power, at least the first lens group and the second lens group being moved along the optical axis upon zooming from a wide-angle end state to a telephoto end state, so that a distance between the first lens group and the second lens group decreases, and a distance between the second lens group and the third lens group increases, the first lens group including one positive lens, the second lens group including at least one negative lens, and the following conditional expressions being satisfied: where Nd1 denotes a refractive index of the positive lens of the first lens group at d-line, Nd2 denotes a refractive index of at least one negative lens of the second lens group at d-line, and νd1 denotes an Abbe number of the positive lens of the first lens group at d-line.