Patent ID: 9297989
Filing Date: 2016-03-29
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, and a third lens group having a positive refractive power in this order from the object side, a stop being provided within the second lens group and only the first lens group and the second lens group being moved to change magnification; wherein the first lens group substantially consists of an L11 negative lens with a concave surface toward the image side, an L12 negative lens with a concave surface toward the image side, and an L13 positive lens with a convex surface toward the object side in this order from the object side; the second lens group substantially consists of a stop, an L21 positive lens with a convex surface toward the object side, a cemented lens having a positive refractive power as a whole which is formed by an L22 positive lens with a convex surface toward the object side and an L23 negative lens with a concave surface toward the image side together, and an L24 negative lens with a convex surface toward the image side, having at least one aspherical surface, in this order from the object side; wherein the third lens group substantially consists of an L31 positive lens; and conditional formula below is satisfied: N13: the refractive index with respect to the d-line of the L13 positive lens.