| 摘要 |
A zoom lens includes: a first lens unit of positive refractive power; a second lens unit of negative refractive power; a third lens unit of positive refractive power; and a fourth lens unit of positive refractive power, being disposed in that order from an object side to an image side, in which the second and fourth lens units are moved in a direction parallel with an optical axis of the zoom lens during zooming, the first lens unit consists of one negative lens and three or fewer positive lenses, being disposed in that order from the object side to the image side, and the following condition is satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>25.1<ZxBD1/BD2<4.1xZ, <?in-line-formulae description="In-line Formulae" end="tail"?> where BD1 and BD2 are lengths of the first and second lens units along the optical axis, and Z is a zoom ratio.
|
