Provided is a compact zoom lens having a high aperture ratio and high optical performance over an entire zoom range. The zoom lens includes, in order from object side to image side: first, second, and third lens units respectively having positive, negative, and positive refractive powers; an aperture stop; a middle lens group; and a final lens unit. An interval between adjacent lens units is changed during zooming. The third lens unit includes at least two positive lenses and at least one negative lens. A combined focal length (f12t) of first lens unit and second lens unit at telephoto end, a focal length (fn) of a lens unit (N) having a largest absolute value of the negative refractive power of the lens unit forming middle lens group, a focal length (f3) of third lens unit, and a focal length (ft) of zoom lens at telephoto end are appropriately set.

Provided is a compact zoom lens having a high aperture ratio and high optical performance over an entire zoom range. The zoom lens includes, in order from object side to image side: first, second, and third lens units respectively having positive, negative, and positive refractive powers; an aperture stop; a middle lens group; and a final lens unit. An interval between adjacent lens units is changed during zooming. The third lens unit includes at least two positive lenses and at least one negative lens. A combined focal length (f12t) of first lens unit and second lens unit at telephoto end, a focal length (fn) of a lens unit (N) having a largest absolute value of the negative refractive power of the lens unit forming middle lens group, a focal length (f3) of third lens unit, and a focal length (ft) of zoom lens at telephoto end are appropriately set.

The optical system according to the embodiment includes a first lens group, a second lens group, and a third lens group sequentially arranged along an optical axis from an object side to an image side and wherein each of the first to third lens groups including at least one lens; wherein a refractive power sign of the first lens group and a refractive power sign of the second lens group are opposite to each other, and wherein the first lens group, the second lens group, and the third lens group satisfy Equation 1 below.

[00001]$\begin{array}{cc}0.6<.Math.\mathrm{f\_}1/\mathrm{f\_}23.Math.<1.4& \left[\mathrm{Equation}1\right]\end{array}$

(In Equation 1, f_1 is a focal length of the first lens group, f_23 is a combined focal length of the second lens group and the third lens group.)

The optical system according to the embodiment includes a first lens group, a second lens group, and a third lens group sequentially arranged along an optical axis from an object side to an image side and wherein each of the first to third lens groups including at least one lens; wherein a refractive power sign of the first lens group and a refractive power sign of the second lens group are opposite to each other, and wherein the first lens group, the second lens group, and the third lens group satisfy Equation 1 below.

[00001]$\begin{array}{cc}0.6<.Math.\mathrm{f\_}1/\mathrm{f\_}23.Math.<1.4& \left[\mathrm{Equation}1\right]\end{array}$

(In Equation 1, f_1 is a focal length of the first lens group, f_23 is a combined focal length of the second lens group and the third lens group.)

A zoom lens includes a positive first unit, a negative second unit, and a rear lens system. The rear lens system includes a positive unit A, a negative unit B, and a positive C. The first unit is not moved for zooming, the unit A is moved for zooming, and intervals between adjacent lens units are changed during zooming. The first unit includes positive and negative lenses, the unit C includes positive and negative lenses, the second unit includes negative lenses, and the unit B includes positive lenses. An Abbe number average value of the positive lenses in the first unit, an Abbe number average value of the negative lenses in the second unit, an Abbe number average value of the positive lenses in the unit B, and an Abbe number average value of the positive lenses in the unit C are appropriately set.

A zoom lens includes a positive first unit, a negative second unit, and a rear lens system. The rear lens system includes a positive unit A, a negative unit B, and a positive C. The first unit is not moved for zooming, the unit A is moved for zooming, and intervals between adjacent lens units are changed during zooming. The first unit includes positive and negative lenses, the unit C includes positive and negative lenses, the second unit includes negative lenses, and the unit B includes positive lenses. An Abbe number average value of the positive lenses in the first unit, an Abbe number average value of the negative lenses in the second unit, an Abbe number average value of the positive lenses in the unit B, and an Abbe number average value of the positive lenses in the unit C are appropriately set.

A zoom lens includes, in order from an object side to an image 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 rear lens group including one or more lens units, and an aperture stop. During zooming, with the first lens unit not moving, the second lens unit and at least one of the lens units of the rear lens group move. In this zoom lens, the configuration of the third lens unit and the location of the aperture stop are appropriately set.

A zoom lens includes, in order from an object side to an image 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 rear lens group including one or more lens units, and an aperture stop. During zooming, with the first lens unit not moving, the second lens unit and at least one of the lens units of the rear lens group move. In this zoom lens, the configuration of the third lens unit and the location of the aperture stop are appropriately set.

Provided is a zoom lens, including, in order from object side: a positive first unit; a negative second unit; a third unit having a positive or positive refractive power; and a rear group including at least one unit, in which: the first unit is not moved for zooming, and intervals between adjacent units are changed during zooming; the first unit includes three lenses, and the second unit includes three lenses; at least two lens surfaces, among lens surfaces of lenses included in the second unit except for a lens arranged closest to the object side, have aspherical shapes; and focal lengths of the zoom lens at a wide angle end and at a telephoto end, movement amounts of the second and third units during zooming from the wide angle end to the telephoto end are appropriately set.

Provided is a zoom lens, including, in order from object side: a positive first unit; a negative second unit; a third unit having a positive or positive refractive power; and a rear group including at least one unit, in which: the first unit is not moved for zooming, and intervals between adjacent units are changed during zooming; the first unit includes three lenses, and the second unit includes three lenses; at least two lens surfaces, among lens surfaces of lenses included in the second unit except for a lens arranged closest to the object side, have aspherical shapes; and focal lengths of the zoom lens at a wide angle end and at a telephoto end, movement amounts of the second and third units during zooming from the wide angle end to the telephoto end are appropriately set.