Patent ID: 8649105

Claim:
A zoom lens system comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a reflection member for bending an optical path; and a rear group comprising a plurality of lens units, including a third lens unit provided at a position nearer, along an optical path direction, to the object side than any other lens unit among the plurality of lens unit of the rear group, wherein the first lens unit is configured to move to the object side while the second lens unit is configured to move to the image side with respect to an imaging plane while zooming from a wide angle end to a telephoto end, and wherein the following conditional expressions are satisfied: 0.1 <|M 1 /M 2|<20.0; 0.050<| f 2 /ft| <0.175; and 1.809 ≦DM 23 t/fw< 10.0, where M 1 and M 2 denote movement amounts of the first lens unit and the second lens unit, respectively, with respect to the image plane in zooming from the wide angle end to the telephoto end, f2 denotes a focal length of the second lens unit, DM 23 t denotes an interval on an optical axis at the telephoto end, between a lens that is thirdly disposed from the objective side, among lens units that move during zooming, and the second lens unit, fw denotes a focal length of the zoom lens system at the wide angle end, and ft denotes a focal length of the zoom lens system at the telephoto end.