Patent ID: 8885264

Claim:
A zoom lens, comprising, in order from an object side to an image side: a first lens unit having a positive refractive power which does not move for zooming; a second lens unit having a negative refractive power which moves during zooming; a third lens unit having a positive refractive power which moves during zooming; a fourth lens unit which moves during zooming; and a fifth lens unit having a positive refractive power which does not move for zooming, wherein the second lens unit passes through a point at which, an imaging magnification of the second lens unit becomes −1 during zooming from a wide-angle end to a telephoto end, and the following expressions are satisfied: −1<β34<−0.3, and 4.0<| m 2 /m 3|<15, where β34 represents an imaging magnification of a combined lens unit including the third lens unit and the fourth lens unit at a zoom position fz at which the imaging magnification of the second lens unit becomes −1, and m2 and m3 respectively represent displacements of the second lens unit and the third lens unit on an optical axis at the room position fz with reference to the wide-angle end.