The zoom lens according to the present invention includes, in order from an object side to an image side, a first lens unit with a negative refractive power and a rear lens group including one or more lens units, in which intervals between adjacent ones of the lens units are changed during zooming and focusing. The first lens unit includes three or more negative lenses. The rear lens group includes a focus lens unit with a negative refractive power that moves during focusing. A focal length of the first lens unit, a shortest focal length of the zoom lens, curvature radii of object-side and image-side lens surfaces of a lens in the first lens unit disposed closest to the object side, and a focal length of the focus lens unit are appropriately set.

The zoom lens consists of, in order from the object side, a first lens group that has a negative refractive power; a second lens group that has a positive refractive power; a third lens group that has a negative refractive power; and a fourth lens group that has a positive refractive power. During zooming, in each lens group, distances between the adjacent groups in the direction of the optical axis are changed. The first lens group consists of, in order from the object side, a first lens having a negative refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power. The third lens group consists of a negative lens. During focusing, only the third lens group moves along the optical axis. The zoom lens satisfies predetermined conditional expressions.

The zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a middle group including two or more lens units, and a rear group including one or more lens units and having a positive refractive power. The first lens unit does not move for zooming. During zooming, the second lens unit moves and a distance between each adjacent lens units changes. In all lens units of the zoom lens, during zooming the second lens unit moves by a largest moving amount and has a largest zooming ratio between a wide-angle end and a telephoto end. Predetermined conditions are satisfied.

An optical system (LS) includes lenses (L22,L23) satisfying the following conditional expressions,

νdLZ<35.0, and

0.702<θgFLZ+(0.00316×νdLZ), where νdLZ: Abbe number of the lens with reference to d-line, and θgFLZ: a partial dispersion ratio of the lens, wherein θgFLZ is defined by the following expression,

θgFLZ=(ngLZ−nFLZ)/(nFLZ−nCLZ). wherein a refractive index of the lens with reference to g-line is ngLZ, a refractive index of the lens with reference to F-line is nFLZ, and a refractive index of the lens with reference to C-line is nCLZ.

A zoom lens includes a first lens unit having negative refractive power, a second lens unit having positive refractive power, and a rear lens group including one or more lens units. The zoom lens includes an aperture stop. The rear lens group includes a focus lens unit having negative refractive power that is moved to an image side in focusing from an infinite to a close distance and at least one lens unit arranged on the image side of the focus lens unit. The first lens unit includes three or more negative lenses. The focus lens unit includes a cemented lens or a single lens. The zoom lens satisfies a predetermined inequality.

A variable magnification optical system comprises: a first lens group having a negative refractive power; at least one positive lens disposed closer to an image side than the first lens group; an aperture, the at least one positive lens being disposed between the first lens group and the aperture; an intermediate group having a plurality of lenses disposed closer to the image side than the aperture; and a vibration-reduction lens group disposed closer to the image side than the intermediate group. The plurality of lenses of the intermediate group integrally move upon varying magnification, and the system satisfies the conditional expression 1.500<f(1˜Gn)t/ft<100.000, where f(1˜Gn)t denotes a composite focal length from the first lens group to the intermediate group in a telephoto end state, and ft denotes a focal length of the entire system in the telephoto end state.

The zoom lens consists of, in order from the object side, a first lens group that has a negative refractive power; a second lens group that has a positive refractive power; a third lens group that has a negative refractive power; and a fourth lens group that has a positive refractive power. During zooming, in each lens group, distances between the adjacent groups in the direction of the optical axis are changed. The first lens group consists of, in order from the object side, a first lens having a negative refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power. The third lens group consists of a negative lens. During focusing, only the third lens group moves along the optical axis. The zoom lens satisfies predetermined conditional expressions.

A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. The first lens unit includes a negative lens B1Ln with a concave surface facing the object side. The second lens unit includes at least one negative lens. During zooming from a wide-angle end to a telephoto end, the first lens unit moves, and the fourth lens unit is fixed or moves from the object side to the image side. A predetermined condition is satisfied.

A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. The first lens unit includes a negative lens B1Ln with a concave surface facing the object side. The second lens unit includes at least one negative lens. During zooming from a wide-angle end to a telephoto end, the first lens unit moves, and the fourth lens unit is fixed or moves from the object side to the image side. A predetermined condition is satisfied.

A zoom lens (ZL) comprises, in order from an object: a first lens group (G1) having negative refractive power; an aperture stop (S); a second lens group (G2) having positive refractive power; a third lens group (G3) having negative refractive power; and a fourth lens group (G4) having positive refractive power. In this zoom lens (ZL), upon zooming from a wide angle end state to a telephoto end state, a distance between the aperture stop (S) and the first lens group (G1), a distance between the aperture stop (S) and the second lens group (G2), and a distance between the aperture stop (S) and the third lens group (G3) are changed and the aperture stop (S) is moved in an optical axis direction.