Provided is a zoom lens including, 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 fourth lens unit having a negative refractive power; a fifth lens unit having a positive refractive power; a sixth lens unit having a negative refractive power; a seventh lens unit having a positive refractive power; and an eighth lens unit having a negative refractive power, in which an interval between each pair of adjacent lens units is changed for zooming.

A variable magnification optical system comprising, in order from an object side, a first lens group and a plurality of lens groups; upon varying a magnification, a distance between the first lens group and the plurality of lens groups being varied, and distances between respective lens groups in the plurality of lens groups being varied; the plurality of lens groups comprising an object side focusing lens group which is moved upon carrying out focusing and at least one image side focusing lens group disposed in a more image side than the object side focusing lens group and moved with a trajectory differing from that of the object side focusing lens group, upon carrying out the focusing; and the predetermined conditional expressions being satisfied, whereby variations in aberrations upon varying magnification from the wide angle end state to the telephoto end state as well as variations in aberrations upon carrying out focusing from an infinite distance object to a close distance object can be suppressed superbly.

Provided is a zoom lens device and an optical device with which it is possible to increase a moving distance of a moving cylinder in an optical axis direction without an increase in number of components, the moving cylinder including a lens group closest to a subject side. A zoom lens device (1) includes a fixed cylinder (30), a cam cylinder (20) that is positioned outside the fixed cylinder (30), a first movement group that is positioned outside the cam cylinder (20) and that includes a first lens group (H1) provided at a distal end portion, and a second movement group that is positioned inside the fixed cylinder (30) and that includes a second lens group (H2). The first movement group includes a first straight groove (4) that guides the first movement group straight and a first cam follower pin (3) that engages with a first cam groove formed at the cam cylinder (20), and the second movement group includes a second cam follower pin (2) that penetrates a second straight groove formed at the fixed cylinder (30) and a second cam groove formed at the cam cylinder (20) and that engages with the first straight groove (4).

The zoom lens includes a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, a negative fifth lens group, and a positive sixth lens group in order from an object side. All distances between adjacent lens groups change during zooming. The first lens group consists of a negative lens, a positive lens, and a positive lens in order from the object side. Only the fourth lens group moves to an image side during focusing from a long range to a short range. Conditional Expression related to a distance from a lens surface of the first lens group closest to the object side to an image plane and a distance from a lens surface of the second lens group closest to the object side to the image plane is satisfied.

An optical system, a lens module, and an electronic device are provided. The optical system includes sequentially, from an object side to an image side along an optical axis, first to seventh lenses. Object-side surfaces and image-side surfaces of the first lens and the fifth to seventh lenses are aspheric surfaces. The object-side surfaces of the first lens and the fifth lens are convex near the optical axis. The object-side surface and the image-side surface of the second lens are concave. The object-side surface and the image-side surface of the third lens are convex. The object-side surface of the sixth lens is concave near the optical axis. The image-side surface of the seventh lens is concave near the optical axis.

A projection system includes a first lens group to an n-th lens group with n being 6 or 7 sequentially arranged from a enlargement side. The first lens group includes a first-first lens group and a first-second lens group sequentially arranged from the enlargement side. The two lens groups are separated from each other by a variable distance for image plane correction. The first lens group and the n-th lens group are fixed and the second lens group to the (n−1)-th group are moved when the magnification is changed. The following conditional expression is satisfied: 2<BF/fw<2.8, where fw represents the focal length of the projection system operating at the wide angle end, and BF represents the air conversion length of the back focal distance of the projection system.

An optical imaging lens assembly includes, sequentially from an object side to an image side along an optical axis, a first lens group having positive refractive power and including a first lens with refractive power; a second lens group, sequentially from the object side to the image side along the optical axis, including a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, each of which having refractive power; a plate glass; and a photosensitive element. At least one surface of at least one lens among the first to the sixth lenses is a non-rotationally symmetric surface. At least one of the first lens to the sixth lens is configured to be movable relative to the photosensitive element in the direction of the optical axis. A maximum optical distortion Distmax of the optical imaging lens assembly may satisfy: |Distmax|<5%.

A camera optical lens includes a first lens to a sixth lens. The camera optical lens satisfies: 6.50≤f3/f≤10.00; 1.50≤(R3+R4)/(R3−R4)≤3.00; 8.00≤d1/d2≤10.50; 1.50≤d8/d7≤2.00, where f denotes a focal length of the camera optical lens, f3 denotes a focal length of a third lens, R3 and R4 respectively denotes curvature radiuses of an object side surface and an image side surface of a second lens, d1 denotes an on-axis thickness of the first lens, d2 denotes an on-axis distance from an image side surface of the first lens to an object side surface of the second lens, d7 denotes an on-axis thickness of a fourth lens, and d8 denotes an on-axis distance from an image side surface of the fourth lens to an object side surface of a fifth lens. The camera optical lens has a good optical performance and meets the design requirements for a large aperture, a wide angle and ultra-thinning.

A camera optical lens includes successively from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The camera optical lens satisfies 58.00≤v1≤82.00; 2.30≤R5/R6; and 0.80≤d8/d10≤1.20, where v1 denotes an abbe number of the first lens, R5 denotes a curvature radius of an object side surface of the third lens, R6 denotes a curvature radius of an image side surface of the third lens, d8 denotes an on-axis distance from an image side surface of the fourth lens to an object side surface of the fifth lens, and d10 denotes an on-axis distance from an image side surface of the fifth lens to an object side surface of the sixth lens. The camera optical lens meets design requirements of a large aperture, a wide angle, and ultra-thinness while having good optical performance.

A camera optical lens includes successively from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The camera optical lens satisfies 58.00≤v1≤82.00; 2.30≤R5/R6; and 0.80≤d8/d10≤1.20, where v1 denotes an abbe number of the first lens, R5 denotes a curvature radius of an object side surface of the third lens, R6 denotes a curvature radius of an image side surface of the third lens, d8 denotes an on-axis distance from an image side surface of the fourth lens to an object side surface of the fifth lens, and d10 denotes an on-axis distance from an image side surface of the fifth lens to an object side surface of the sixth lens. The camera optical lens meets design requirements of a large aperture, a wide angle, and ultra-thinness while having good optical performance.