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 zoom lens includes a first lens group with a negative refractive power, a second lens group with a positive refractive power, and a third lens group with a positive refractive power. When the zoom lens changes from a wide angle end to a telephoto end, a spacing between the first lens group and the second lens group is reduced, and a spacing between the second lens group and the third lens group changes. The first lens group includes a first lens, a second lens, a third lens, and a fourth lens. Refractive powers of the first lens, the second lens, and the third lens are negative, and a refractive power of the fourth lens is positive. Abbe numbers of the first lens, the second lens, and the third lens are larger than 60. A ratio of a focal length of the first lens group over a focal length of the zoom lens at a wide angle end is larger than ?2.5 and smaller than ?1.2.

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 zoom lens includes a first lens group with a negative refractive power, a second lens group with a positive refractive power, and a third lens group with a positive refractive power. When the zoom lens changes from a wide angle end to a telephoto end, a spacing between the first lens group and the second lens group is reduced, and a spacing between the second lens group and the third lens group changes. The first lens group includes a first lens, a second lens, a third lens, and a fourth lens. Refractive powers of the first lens, the second lens, and the third lens are negative, and a refractive power of the fourth lens is positive. Abbe numbers of the first lens, the second lens, and the third lens are larger than 60. A ratio of a focal length of the first lens group over a focal length of the zoom lens at a wide angle end is larger than ?2.5 and smaller than ?1.2.

Abstract: An imaging lens according to the disclosure includes a negative front group, a stop, and a positive rear group. The front group includes a negative first lens having a meniscus shape with a convex surface facing the object side, a negative second lens having the meniscus shape with a convex surface facing the object side, and a positive third lens having a biconvex shape. The rear group includes a positive fourth lens, a negative fifth lens with a concave surface facing the image side, and a positive sixth lens.

Abstract: An imaging lens according to the disclosure includes a negative front group, a stop, and a positive rear group. The front group includes a negative first lens having a meniscus shape with a convex surface facing the object side, a negative second lens having the meniscus shape with a convex surface facing the object side, and a positive third lens having a biconvex shape. The rear group includes a positive fourth lens, a negative fifth lens with a concave surface facing the image side, and a positive sixth lens.

Abstract: Disclosed herein is a zoom lens including a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The zoom lens satisfies following conditional expressions (1) and (2), 0.03<H1?/f1<0.3??(1) 0.3<|f2|/?(fw·ft)<0.65??(2) where H1? is an interval from a vertex of a surface nearest to the image side in the first lens group to a principal point on the image side of the first lens group (? denotes the object side, and + denotes the image side), f1 is focal length of the first lens group, f2 is focal length of the second lens group, fw is focal length of an entire lens system at a wide-angle end, and ft is the focal length of the entire lens system at a telephoto end.

Abstract: Disclosed herein is a zoom lens including a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group. The zoom lens satisfies following conditional expressions (1) and (2), 0.03<H1?/f1<0.3??(1) 0.3<|f2|/?(fw·ft)<0.65??(2) where H1? is an interval from a vertex of a surface nearest to the image side in the first lens group to a principal point on the image side of the first lens group (? denotes the object side, and + denotes the image side), f1 is focal length of the first lens group, f2 is focal length of the second lens group, fw is focal length of an entire lens system at a wide-angle end, and ft is the focal length of the entire lens system at a telephoto end.

Abstract: A zoom lens includes first to fifth lens groups respectively having positive, negative, positive, positive, and negative refractive powers in that order from the object side. Zooming is performed by moving the second lens group and the fourth lens group in an optical-axis direction. The first lens group includes a front lens group having a negative refractive power, an optical member for bending an optical path, and a rear lens group having a positive refractive power in that order from the object side. The front lens group is a cemented lens in which a first lens having a negative refractive power is bonded to a second lens having a positive refractive power in that order from the object side to the image side.

Abstract: A zoom lens includes first to fifth lens groups respectively having positive, negative, positive, positive, and negative refractive powers in that order from the object side. Zooming is performed by moving the second lens group and the fourth lens group in an optical-axis direction. The first lens group includes a front lens group having a negative refractive power, an optical member for bending an optical path, and a rear lens group having a positive refractive power in that order from the object side. The front lens group is a cemented lens in which a first lens having a negative refractive power is bonded to a second lens having a positive refractive power in that order from the object side to the image side.