Patent ID: 9377607
Filing Date: 2016-06-28
CPC Classification: G02B

Claim Text:
1. A zoom lens substantially consisting of a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power, in this order from the object side; wherein the first lens group through the fourth lens group move along the optical axis while changing magnification from the wide angle end to the telephoto end so as to change the distances among one another such that the distance between the first lens group and the second lens group is reduced and the distance between the second lens group and the third lens group is increased; the fifth lens group is fixed with respect to an image surface while changing magnification; and conditional formulas (1) and (2) below are satisfied: f1: the focal length of the first lens group, f2: the focal length of the second lens group, f4: the focal length of the fourth lens group, and f5: the focal length of the fifth lens group.