A lens barrel which is miniaturized without complicating control over a drive unit which moves a plurality of optical members in a direction of an optical axis. A cam member is cam-engaged with each of a first optical member and a second optical member which move in the direction of the optical axis. The cam member is rotated about an axis parallel to the optical axis by a cam action of the cam member and the first optical member, which is driven to move in the direction of the optical axis by a linear actuator. Rotation of the cam member causes the second optical member to move in the direction of the optical axis due to a cam action of the second optical member and the cam member. The axis is arranged at an opposite position to the linear actuator with the optical axis as a center.

Provided is an antireflection film that is formed by laminating an interlayer, a silver-containing metal layer containing silver, and a dielectric layer, in this order, on a substrate, in which the interlayer is a multilayer film having two or more layers, in which a layer of high refractive index having a relatively high refractive index and a layer of low refractive index having a relatively low refractive index are alternately laminated, and the dielectric layer has a surface to be exposed to air and is a multilayer film having two or more layers including an oxide layer and a fluorocarbon layer which is a self-assembled film that is formed by a silane coupling reaction to the oxide layer in this order.

A scope includes an objective lens system having refractive power, a relay lens system having refractive power, and an eyepiece system having refractive power. The relay lens system includes a first, a second, and a third lens groups. The second lens group includes a II-2-1 lens and a II-2-2 lens, and both of which are cemented. The third lens group includes a II-3-1 lens having a convex surface facing an object side and a II-3-2 lens having a convex surface facing an image side, and both of which are cemented. The second lens group and the third lens group can move along an optical axis to change a magnification of the relay lens system and thereby change a magnification of the scope. The objective lens system, the relay lens system, and the eyepiece system are arranged in order from the object side to the image side along the optical axis.

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.

An embodiment of the present invention relates to a camera module comprising: a housing; an optical system disposed in the housing; a substrate disposed under the optical system; and an imaging sensor disposed on the substrate; wherein the optical system comprises a first group lens, a second group lens, a third group lens, a fourth group lens, and a fifth group lens arranged in order, and when the third group lens moves, the effective focal length (EFL) of the optical system is changed.

The zoom lens consists of a first unit, a second unit, a third unit, a fourth unit, and a fifth unit in order from the magnification side, and forms an intermediate image. The first unit consists of one lens group which has a positive refractive power. The second unit consists of two lens groups which move during magnification change and has a negative refractive power as a whole at the wide angle end. The third unit includes one or more lens groups which move during magnification change. The fourth unit includes one or more lens groups which move during magnification change.

A lens barrel including a first lens, an actuator that drives the first lens, a first barrel that holds a first cam follower and the actuator and moves in an optical axis direction, a second lens, and a second barrel that holds a second cam follower and the second lens and moves in the optical axis direction, the second barrel having a first hole portion in which the first cam follower is disposed.

A variable magnification optical system comprising a plurality of lens groups which includes a first negative lens group having negative refractive power, a second negative lens group disposed at a more image side than the first negative lens group and having negative refractive power, a third negative lens group disposed at a more image side than the second negative lens group and having negative refractive power; upon varying a magnification, distances between adjacent lens groups being varied; the first negative lens group being movable to include a component in a direction perpendicular to the optical axis as a vibration reduction lens group; the second negative lens group being moved along the optical axis upon carrying out focusing; and the predetermined conditional expression(s) being satisfied. The variable magnification optical system can attain a high optical performance and be made in small in size.

A lens device includes a first lens system including a first lens, a second lens system including a second lens, a moving member configured to move in an optical axis direction of the first lens, and a physical structure configured to move the first lens in the optical axis direction and move the moving member in a direction opposite to a movement direction of a center of gravity of a physical system that includes the first lens.

Techniques for adjusting a color mixing system depending on beam clipping include receiving target information indicative of a target color of light emitted from the light fixture; receiving a beam clipping system setting for a beam clipping system, wherein the beam clipping system is configured to clip a portion of a beam of light; determining a target color mixing system setting based on the target information and the beam clipping system setting; and controlling a color mixing system according to the target color mixing system setting so as to cause the light fixture to emit light having the target color.