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 zoom lens includes a first lens group and a second lens group. The first lens group has a negative refractive power and includes a first lens, a second lens, and a third lens arranged in sequence from a magnified side to a minified side, refractive powers of which are negative, negative, and positive, respectively. The second lens group has a positive refractive power and is disposed between the first lens group and the minified side. The second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the magnified side to the minified side, refractive powers of which are positive, negative, positive, negative, positive, negative, and positive, respectively. The first lens and the tenth lens are aspheric lenses, and the second lens to the ninth lens are spherical lenses.

A zoom lens includes a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power, in order from an object side to an image side. During zooming, the first lens unit is not moved, and the second lens unit, the third lens unit, and the fourth lens unit are moved to change an interval between adjacent lens units. A moving amount m2 of the second lens unit during zooming from a wide angle end to a telephoto end, a focal length f2 of the second lens unit, and a focal length fw of a whole system at the wide angle end are each set appropriately.

A variable magnification optical system consists of a first lens-group having negative refractive-power, a stop and a second lens-group having positive refractive-power in this order from an object-side. The first lens-group includes an L11 negative meniscus lens, an L12 negative lens and a C11 cemented lens, in which a biconcave lens and a positive lens are cemented together in this order from the object-side, in this order from the object-side. The second lens-group includes an L21 positive lens that is arranged closest to the object-side and includes at least one aspheric surface, and an object-side surface of which is convex, and only two cemented lenses toward an image-side of the L21 positive lens, and each of which consists of a negative lens and a positive lens cemented together in this order from the object-side. The following conditional expressions (1) and (2) are satisfied:
−1.0<Rf11/Rf12<0.7  (1); and
55.0<νdave1  (2).

An optical zoom in a small form factor suitable for use in mobile devices such as cell phones, security cameras, and other small-scale imaging systems. One or more Alvarez lens pairs are provided, and moved transversely to the optical axis. The combination of one or more Alvarez lens pairs and the actuator permits a zoom power of at least 3× with a lateral displacement distance of the optical components of approximately five millimeters or less.

A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group having a plurality of lens elements. During zooming from the short to long focal length extremities, at least the first, third and fifth lens groups move in an optical axis direction. A surface closest to the image side of the zoom lens system is a concave surface facing the image side. The following condition (1) is satisfied:
0.52<(m345t/m345w)/(ft/fw)<0.70  (1),
wherein m345w and m345t designate, at the short and long focal length extremities, respectively, the combined lateral magnification of the third, fourth and fifth lens groups when focused on an object at infinity; and fw and ft designate the focal length of the zoom lens system at the short and long focal length extremities, respectively.

A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group having a plurality of lens elements. During zooming from the short to long focal length extremities, at least the first, third and fifth lens groups move in an optical axis direction. A surface closest to the image side of the zoom lens system is a concave surface facing the image side. The following condition (1) is satisfied:
0.52<(m345t/m345w)/(ft/fw)<0.70  (1),
wherein m345w and m345t designate, at the short and long focal length extremities, respectively, the combined lateral magnification of the third, fourth and fifth lens groups when focused on an object at infinity; and fw and ft designate the focal length of the zoom lens system at the short and long focal length extremities, respectively.

This optical system includes: a device (106) for generating a plane light wave, called a collimated light wave (OL.sub.col); and a device (114) for deviating the collimated light wave so as to provide a light wave, called a test light wave (OL.sub.test), the deviating device (114) having an adjustable focal length.

An image forming lens is formed by sequentially arranging, from an object side to an image side, a first lens group having positive refractive power, an aperture stop, and a second lens group having positive or negative refractive power. The image forming lens satisfies a conditional expression:
0.15<D1a/D1<0.50, where D1a is an air space between the first positive lens and the second positive lens in the first lens group, and D1 is a distance on an optical axis from an object-side lens surface of the first positive lens to an image-side lens surface of the third positive lens in the first lens group.

A zoom lens includes a focus lens unit that moves in focus adjustment, a magnification lens unit including lens units that move in magnification, and a relay lens unit that does not move for magnification, in this order from the object side toward the image side, and a correction lens unit that is disposed in the focus lens unit or magnification lens unit and moves in the optical axis direction to correct displacement of the in-focus position. The amounts of change in in-focus position at the wide angle and telephoto ends with the correction lens unit moved by 1 mm in the optical axis direction, the maximum absolute value of the amount of movement of the correction lens unit for correcting displacement of the in-focus position, and the maximum absolute value of the amount of movement of the lens units in the magnification lens unit are set as appropriate.