A zooming optical system includes, in order from an object side along an optical axis: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group is varied, a distance between the second lens group and the third lens group is varied, and a distance between the third lens group and the fourth lens group is varied; the third lens group is composed of one positive lens; and a focus from an infinite-distance object up to a near-distance object is conducted by moving the third lens group in a direction of the optical axis.

A first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having positive refractive power, a fourth lens group (G4) having negative refractive power, and a fifth lens group (G5) having positive refractive power are arranged in order from an object, and zooming is performed by changing distances between each lens group, and the first lens group (G1) is composed of three or more lenses, the fourth lens group (G4) is composed of two or less lenses, and the fifth lens group (G5) is composed of two or less lenses and moves to an image surface side upon zooming from a wide angle end state to a telephoto end state, and the following conditional expression (1) is satisfied.

8.40<f1/(−f2)  (1) where, f1 denotes a focal length of the first lens group (G1), and f2 denotes a focal length of the second lens group (G2).

A first lens group (G1) having positive refractive power, a second lens group (G2) having negative refractive power, a third lens group (G3) having positive refractive power, a fourth lens group (G4) having negative refractive power, and a fifth lens group (G5) having positive refractive power are arranged in order from an object, and zooming is performed by changing distances between each lens group, and the first lens group (G1) is composed of three or more lenses, the fourth lens group (G4) is composed of two or less lenses, and the fifth lens group (G5) is composed of two or less lenses and moves to an image surface side upon zooming from a wide angle end state to a telephoto end state, and the following conditional expression (1) is satisfied.

8.40<f1/(−f2)  (1) where, f1 denotes a focal length of the first lens group (G1), and f2 denotes a focal length of the second lens group (G2).

A zoom lens includes, in order from an object side, a positive first lens unit configured not to move for zooming, two or more intermediate lens units configured to move for zooming, and a positive rear lens unit. A distance between each pair of adjacent lens units changes for zooming. The first lens unit includes, in order from the object side, a negative first sub lens unit configured not to move for focusing, a positive second sub lens unit configured to move for focusing, and a positive third sub lens unit. Specific conditional expressions are satisfied with respect to a focal length and a thickness of the first lens unit, focal lengths of the zoom lens at a wide angle end and a telephoto end, a backfocus, and a focal length of the first sub lens unit.

A zoom lens includes, in order from an object side, a positive first lens unit configured not to move for zooming, two or more intermediate lens units configured to move for zooming, and a positive rear lens unit. A distance between each pair of adjacent lens units changes for zooming. The first lens unit includes, in order from the object side, a negative first sub lens unit configured not to move for focusing, a positive second sub lens unit configured to move for focusing, and a positive third sub lens unit. Specific conditional expressions are satisfied with respect to a focal length and a thickness of the first lens unit, focal lengths of the zoom lens at a wide angle end and a telephoto end, a backfocus, and a focal length of the first sub lens unit.

A compact zooming optical system, an optical apparatus and a method for manufacturing the zooming optical system having a vibration reduction function, a high zooming ratio, a wide-angle view and superb optical performance are provided, the system including, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; and a fourth lens group G4 having negative refractive power; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2, a distance between the second lens group G2 and the third lens group G3 and a distance between the third lens group G3 and the fourth lens group G4 being respectively varied; the third lens group G3 having, in order from the object side, a first segment group G31 having positive refractive power and a second segment group G32; the second segment group G32 being moved to have a component in a direction perpendicular to the optical axis; and predetermined conditional expressions being satisfied.

A compact zooming optical system, an optical apparatus and a method for manufacturing the zooming optical system having a vibration reduction function, a high zooming ratio, a wide-angle view and superb optical performance are provided, the system including, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; and a fourth lens group G4 having negative refractive power; upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2, a distance between the second lens group G2 and the third lens group G3 and a distance between the third lens group G3 and the fourth lens group G4 being respectively varied; the third lens group G3 having, in order from the object side, a first segment group G31 having positive refractive power and a second segment group G32; the second segment group G32 being moved to have a component in a direction perpendicular to the optical axis; and predetermined conditional expressions being satisfied.

An optical imaging system includes: a first lens group including a plurality of lenses; a second lens group including a plurality of lenses; a first reflecting member disposed on an object side of the first lens group; and a plurality of second reflecting members arranged between the second lens group and an image sensor. One or both of the first lens group and the second lens group is movable along an optical axis, an interval along the optical axis between the first lens group and the second lens group is varied between a first interval and a second interval smaller than the first interval, and as at least one of the first lens group and the second lens group is moved, one or more of the second reflecting members are moved.

A zoom lens includes in order from an object side, a negative first lens unit and a rear lens unit including one or more lens units, an interval between adjacent lens units being changed during zooming, in which the first lens unit and the one or more lens units can be set to first, second and third zoom states, in which angles of view at first and second image heights at the first zoom state are respectively 160° or larger, in which a distortion at the first image height at the third zoom state is −30% or more, and the first image height, the second image height, a total length of the zoom lens at a wide angle end, and a focal length at the wide angle end are appropriately set.

A zoom lens includes in order from an object side, a negative first lens unit and a rear lens unit including one or more lens units, an interval between adjacent lens units being changed during zooming, in which the first lens unit and the one or more lens units can be set to first, second and third zoom states, in which angles of view at first and second image heights at the first zoom state are respectively 160° or larger, in which a distortion at the first image height at the third zoom state is −30% or more, and the first image height, the second image height, a total length of the zoom lens at a wide angle end, and a focal length at the wide angle end are appropriately set.