Patent ID: 8526120

Claim:
A zoom lens, comprising in order from an object side to an image side: a first lens unit including a focusing lens unit and having a positive refractive power; a second lens unit having a negative refractive power and moving for magnification-varying; a third lens unit moving for magnification-varying; and a fourth lens unit having a positive refractive power, wherein the second lens unit comprises four lenses as a whole including a first lens having a negative refractive power and a second lens having a negative refractive power, and the first lens and the second lens are disposed successively in order from the object side to the image side, and wherein the following conditional expressions are satisfied: 7.8 <f 1/| f 2|<12.0; 1.20 <f 21/ f 2<1.63; and 0.04< O 12 /D 2<0.15, where f 1 represents a focal length of the first lens unit, f 2 represents a focal length of the second lens unit, f 21 represents a focal length of the first lens, O 12 represents a distance from a lens surface vertex of the first lens on the object side to an object side principal point position of the second lens unit, and D 2 represents a thickness of the second lens unit on an optical axis.