Patent ID: 8416505

Claim:
A zoom lens consisting in order from an object side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a negative refractive power; and a fifth lens unit having a positive refractive power, wherein at the time of zooming from a wide angle end to a telephoto end, the first lens unit moves toward the object side, the third lens unit moves toward the object side, the fourth lens unit moves toward the object side, a distance between the first lens unit and the second lens unit increases, a distance between the second lens unit and the third lens unit decreases, a distance between the third lens unit and the fourth lens unit changes, and a distance between the fourth lens unit and the fifth lens unit increases, and the zoom lens satisfies the following conditional expressions (1a), (2), and (3) 1.54<β 4T /β 4w <3.0 (1a) 1.0<β 3T /β 3w <5.0 (2) 1.0<β 5T /β 5w <3.0 (3) where, β 4T denotes a lateral magnification of the fourth lens unit at the telephoto end, β 4w denotes a lateral magnification of the fourth lens unit at the wide angle end, β 3T denotes a lateral magnification of the third lens unit at the telephoto end, β 3w denotes a lateral magnification of the third lens unit at the wide angle end, β 5T denotes a lateral magnification of the fifth lens unit at the telephoto end, and β 5w denotes a lateral magnification of the fifth lens unit at the wide angle end.