Patent ID: 7808721

Claim:
A zoom lens system comprising, in order from an object side: a first lens unit having a negative refractive power, wherein the total number of lens elements included in the first lens unit is at least one but no more than two; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, wherein a space between the lens units is changed to perform magnification change; the second lens unit includes a negative lens; a lens of the second lens unit closest to an image side has a concave surface which faces the image side; a lens of the third lens unit closest to the object side is a meniscus lens whose concave surface faces the object side; the third lens unit includes the meniscus lens and a positive lens; and during the magnification change, the space between the second lens unit and the third lens unit is larger in a telephoto end than in a wide-angle end.