The present disclosure discloses a zoom lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens group having refractive power; a second lens group having negative refractive power; a third lens group having refractive power; and a fourth lens group having refractive power. The zoom lens assembly may be continuously zoomed by changing positions of the second lens group and the third lens group along the optical axis. A total effective focal length ft of the zoom lens assembly in a telephoto state, and a total effective focal length fw of the zoom lens assembly in a wide-angle state satisfy: 1.3<ft/fw<3.3.

The present disclosure discloses a zoom lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens group having refractive power; a second lens group having negative refractive power; a third lens group having refractive power; and a fourth lens group having refractive power. The zoom lens assembly may be continuously zoomed by changing positions of the second lens group and the third lens group along the optical axis. A total effective focal length ft of the zoom lens assembly in a telephoto state, and a total effective focal length fw of the zoom lens assembly in a wide-angle state satisfy: 1.3<ft/fw<3.3.

A zoom optical system comprises a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a succeeding lens group, which are arranged in order from an object side. During zooming, distances between adjacent said lens groups change. The succeeding lens group comprises a first focusing lens group having a negative refractive power which is moved during focusing, and a second focusing lens group having a positive refractive power which is moved during focusing, which are arranged in order from an object side. Further, the following conditional expression is satisfied:

0.80<(−fF1)/fF2<5.00, where fF1 represents a focal length of the first focusing lens group, and fF2 represents a focal length of the second focusing lens group.

A zoom optical system comprises a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a succeeding lens group, which are arranged in order from an object side. During zooming, distances between adjacent lens groups change, and the first lens group is fixed with respect to an image surface. During zooming from a wide angle end state to a telephoto end state, the third lens group moves toward an image surface. The succeeding lens group includes a last lens group arranged to be nearest to the image surface. Further, the following conditional expression is satisfied.

−10.00<f3/(−fE)<3.50, where f3 represents a focal length of the third lens group, and fE represents a focal length of the last lens group.

An optical imaging lens includes a first lens element, a second lens, an aperture stop, a third lens element and a fourth lens element from an object side to an image side in order along an optical axis, and each lens element has an object-side surface and an image-side surface. An optical axis of the image-side surface of the first lens element is convex and an optical axis of the image-side surface of the fourth lens element is concave. HFOV stands for the half field of view of the entire optical imaging lens and TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis to satisfy HFOV/TTL≤1.500°/mm.

The disclosure discloses a zoom lens group, which sequentially includes from an object side to an image side along an optical axis: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a refractive power and having a fifth lens and a sixth lens, wherein the fifth lens and the sixth lens are formed into a cemented lens; and a fourth lens group having a refractive power. By adjusting a spacing distance on the optical axis between the first lens group and the second lens group, a spacing distance on the optical axis between the second lens group and the third lens group and a spacing distance on the optical axis between the third lens group and the fourth lens group, the zoom lens group is switched from a long-focus state to a wide-angle state.

An optical imaging lens includes a first lens element, a second lens, an aperture stop, a third lens element and a fourth lens element from an object side to an image side in order along an optical axis, and each lens element has an object-side surface and an image-side surface. An optical axis of the image-side surface of the first lens element is convex and an optical axis of the image-side surface of the fourth lens element is concave. HFOV stands for the half field of view of the entire optical imaging lens and TTL is a distance from the object-side surface of the first lens element to an image plane along the optical axis to satisfy HFOV/TTL≤1.500°/mm.

A telephoto imaging system includes: a solid lens assembly and a tunable lens assembly. The solid lens assembly includes a first group, a second group, and a third group of solid lenses along the optical axis from the object plane to the image plane. The tunable lens assembly is configured for zooming under the effect of a driving mechanism to achieve focusing on objects at different distances. The following condition is satisfied by the tunable lens assembly when at least an in-focus state exists in the focusing process: 0<|delta(f/ft)|<0.9.

A zoom lens system includes a first lens group; a second lens group; and a subsequent lens group arranged in that order from the object side. The second lens group consists of a second lens group-a, a second lens group-b, and a second lens group-c arranged in that order from the object side. A distance between the first lens group and the second lens group increases and a distance between the second lens group and the subsequent lens group decreases during a change in magnification from a short focal length end to a long focal length end. During a change in focus from infinity to a short distance, the second lens group-b is movable to the image side, and a distance between the second lens group-a and the second lens group-b and a distance between the second lens group-b and the second lens group-c are changeable.

The disclosure discloses a zoom lens group, which sequentially includes from an object side to an image side along an optical axis: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a refractive power and having a fifth lens and a sixth lens, wherein the fifth lens and the sixth lens are formed into a cemented lens; and a fourth lens group having a refractive power. By adjusting a spacing distance on the optical axis between the first lens group and the second lens group, a spacing distance on the optical axis between the second lens group and the third lens group and a spacing distance on the optical axis between the third lens group and the fourth lens group, the zoom lens group is switched from a long-focus state to a wide-angle state.