Patent ID: 9207439
Filing Date: 2015-12-08
Classification: G02B

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 which does not move for zooming; a second lens unit having a negative refractive power which moves during zooming; a third lens unit having a positive refractive power which moves during zooming; a fourth lens unit having a negative refractive power which moves during zooming; and a fifth lens unit having a positive refractive power which does not move for zooming, wherein: the first lens unit comprises, in order from the object side to the image side, a first sub lens unit having a negative refractive power which does not move for focusing, a second sub lens unit having a positive refractive power which moves during focusing, and a third sub lens unit having a positive refractive power which does not move for focusing; the third sub lens unit comprises a negative lens; and the following conditions are satisfied: where L2t represents an interval between the second lens unit and the third lens unit at a telephoto end, L2tm represents an interval between the second lens unit and the third lens unit at a zoom position at which an interval between the third lens unit and the fourth lens unit is minimum, L2w represents an interval between the second lens unit and the third lens unit at a wide-angle end, L3w represents an interval between the third lens unit and the fourth lens unit at the wide-angle end, f2 represents a focal length of the second lens unit, and f3 represents a focal length of the third lens unit.