Patent ID: 8988588
Filing Date: 2015-03-24
Classification: G02B,H04N

Abstract:
1. A zoom lens comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a rear lens group including one or more lens units, wherein the first lens unit is closer to the object side at a telephoto end than at a wide angle end, and wherein, when Dt23 is a distance between the second lens unit and the third lens unit at the telephoto end, fw and ft are focal lengths of the entire zoom lens at the wide angle end and the telephoto end, respectively, f2 is a focal length of the second lens unit, f1 is a focal length of the first lens unit, the following conditional expressions are satisfied: