Abstract: A lens system includes sequentially from an object side: a first lens group having a positive refractive power; an aperture diaphragm; a second lens group having a positive refractive power; and a third lens group having a positive refractive power and moving along a direction of an optical axis when focusing from an object at infinity to a close object. Assuming that L is a distance from a lens surface of the first lens group closest to the object side to a lens surface closest to an image side on the optical axis, Y is a maximum image height, f1 is a focal length of the first lens group, and f is a focal length of the entire lens system, the lens system satisfies the following conditions: 1.0<L/Y<2.3, and 1<f1/f<3.

Abstract: A lens system is provided. The lens system includes a positive first lens group, an aperture diaphragm, a positive second lens group, and a third lens group, disposed sequentially from a subject side. The first lens group includes at least three positive lenses and at least one negative lens. The second lens group includes four or more lenses including at least one cemented lens. A negative lens with a concave surface toward the subject side is disposed at the subject side. The third lens group includes three or more lenses including at least one positive lens and at least one negative lens. When focusing is moving from an infinity-distance subject to a short-distance subject, the first lens group, the aperture diaphragm, and the second lens group move integrally toward the subject side, while the third lens group is fixed with respect to an image surface.

Abstract: A lens system, a photographing apparatus, and a moving body. The lens system may consist essentially of a first lens group having positive refractive power, an aperture stop, and a second lens group having positive refractive power in order from an object side to an image side. When focusing from an infinity focus state to a close object focus state, the first lens group and the second lens group may be configured to move from the image side to the object side with a fixed interval between the first lens group and the second lens group on an optical axis. The first lens group may consist essentially of three or more lenses, which may include one or more cemented lenses and one aspherical meniscus lens with a convex surface facing the object side in order from the object side.

Abstract: A control device includes a memory storing instructions, and a processor configured to execute the instructions to obtain transmittance information related to transmittances of a plurality of neutral-density filters of an imaging device, receive a target transmittance, select at least one neutral-density filter of the plurality of neutral-density filters to achieve the target transmittance according to priority information related to a predetermined priority order of the plurality of neutral-density filters and the transmittance information of the at least one neutral-density filter, and control the at least one neutral-density filter to be in an effective state.

Abstract: There is provided an optical device that provides a high quality image. The optical device includes a first light guiding member that has first through sixth surfaces and a first deflecting means. The first, second, and fifth surfaces are opposed to the third, fourth, and sixth surfaces, respectively. The optical device further includes a second light guiding member that has seventh through twelfth surfaces and a second deflecting means. The seventh, eighth, and eleventh surfaces are opposed to the ninth, tenth, and twelfth surfaces, respectively. Light that enters from the fifth surface is totally reflected within the first light guiding member, is deflected by the first deflecting means, is emitted from the third surface, enters the eighth surface, is totally reflected between the seventh surface and the ninth surface, is deflected by the second deflecting means, and is emitted from the seventh surface.

Abstract: This disclosure is related to a sensor and a mobile object. The mobile object may include a housing having a light-transmitting portion; a light receiving element inside the housing; and a light guide member inside the housing. The light guide member may be configured to guide light transmitted through the light-transmitting portion to the light receiving element.

Abstract: A control device includes a memory storing instructions, and a processor configured to execute the instructions to obtain transmittance information related to transmittances of a plurality of neutral-density filters of an imaging device, receive a target transmittance, select at least one neutral-density filter of the plurality of neutral-density filters to achieve the target transmittance according to priority information related to a predetermined priority order of the plurality of neutral-density filters and the transmittance information of the at least one neutral-density filter, and control the at least one neutral-density filter to be in an effective state.

Abstract: An object of the present invention is to provide an optical device, an image display device, and a display device that can provide an image of high image quality.

Abstract: A lens system is provided. The lens system includes a positive first lens group, an aperture diaphragm, a positive second lens group, and a third lens group, disposed sequentially from a subject side. The first lens group includes at least three positive lenses and at least one negative lens. The second lens group includes four or more lenses including at least one cemented lens. A negative lens with a concave surface toward the subject side is disposed at the subject side. The third lens group includes three or more lenses including at least one positive lens and at least one negative lens. When focusing is moving from an infinity-distance subject to a short-distance subject, the first lens group, the aperture diaphragm, and the second lens group move integrally toward the subject side, while the third lens group is fixed with respect to an image surface.

Abstract: An optical element in which light with a large principal ray input angle is gradually input from a center to a peripheral portion, a thickness gradually increases from the center to the peripheral portion, and 1<RD?1.085 is satisfied, when an increase ratio of a thickness to the center at an outermost peripheral portion to which light of which the principal ray input angle is maximum is input is set to RD.

Abstract: An optical element in which light with a large principal ray input angle is gradually input from a center to a peripheral portion, a thickness gradually increases from the center to the peripheral portion, and 1<RD<1.085 is satisfied, when an increase ratio of a thickness to the center at an outermost peripheral portion to which light of which the principal ray input angle is maximum is input is set to RD.

Abstract: There is provided an imaging device including an image sensor that performs photoelectric conversion on subject light to generate an image signal, a photographing optical system that forms an image of the subject light on the image sensor, and a first optical member that transmits the subject light incident on the image sensor via the photographing optical system. The first optical member changes transmittance of a first band of the subject light according to an angle with respect to an optical axis of the photographing optical system.