Patent ID: 8670185

Claim:
A zoom lens comprising, in order from an object side: a first lens unit having positive refractive power which does not move for varying magnification; a magnification-varying lens unit including at least two lens units which move for varying magnification; an aperture stop; and an imaging lens unit having positive refractive power which does not move for varying magnification, wherein the first lens unit includes, in order from the object side, a first sub-lens unit having positive refractive power, a second sub-lens unit having negative refractive power, and a third sub-lens unit having positive refractive power, wherein the second sub-lens unit is driven to the object side so as to perform a focus adjustment to an object at a short distance, and wherein the following expression is satisfied: 0.07 <f 1 /f 11<0.35, where f 1 represents a focal length of the first lens unit, and f 11 represents a focal length of the first sub-lens unit.