Zoom lens and image pickup apparatus including the same

摘要

A zoom lens includes, in order from an object side to an image side, first to fourth lens units having negative, positive, negative, and positive refractive power, respectively. During zooming from a wide-angle end to a telephoto end, at least the first, second, and third lens units move. The focal lengths of the first, second, and third lens units, the amount of movement of the second lens unit during zooming from the wide-angle end to the telephoto end, a lateral magnification at the wide-angle end of the second lens unit, a lateral magnification at the wide-angle end of the third lens unit, a lateral magnification at the telephoto end of the second lens unit, and the lateral magnification at the telephoto end of the third lens unit are appropriately set.

主权项

1. A zoom lens comprising, in order from an object side to an image side:
a first lens unit having negative refractive power; a second lens unit having positive refractive power; a third lens unit having negative refractive power; and a fourth lens unit having positive refractive power, wherein at least the first lens unit, the second lens unit, and the third lens unit move during zooming, and wherein, when a focal length of the first lens unit is denoted by f1, a focal length of the second lens unit is denoted by f2, a focal length of the third lens unit is denoted by f3, an amount of movement of the second lens unit during zooming from a wide-angle end to a telephoto end is denoted by M2, a lateral magnification at the wide-angle end of the second lens unit is denoted by β2w, a lateral magnification at the wide-angle end of the third lens unit is denoted by β3w, a lateral magnification at the telephoto end of the second lens unit is denoted by β2t, and a lateral magnification at the telephoto end of the third lens unit is denoted by β3t, the following conditions are satisfied:
0.08<|f1|/|f3|<0.350.10