Patent ID: 8547644

Claim:
A zoom lens comprising: a first lens unit having a negative refractive power and which is provided at a location closest to an object side; a lens unit LP having a positive refractive power, which is provided at a location closest to an image side, and which is stationary during zooming; and a lens unit LN having a negative refractive power, which is provided adjacent to the lens unit LP on the object side of the lens unit LP, and which is configured to move during zooming, wherein, when fp and fn respectively denote focal lengths of the lens unit LP and of the lens unit LN, fw and ft respectively denote focal lengths at a wide-angle end and at a telephoto end of the entire zoom lens, and fni and νdni respectively denote a focal length and Abbe number of an i-th lens among lenses that constitute the lens unit LN, the following conditions are satisfied: 0.66<| fn /√( fw·ft )|<0.78 1.86≦| fp/fn |<5.3 |Σ((1/( νdni )×(√( fw·ft )/ fni ))|<0.023, where i is a positive integer equal to or greater than 1 counted from the object side towards the image side.