Abstract: A zoom lens arranged along an optical axis includes a first lens group and a second lens group. The second lens group has at least one aspheric lens. The first lens group moves toward an image side and the second lens group moves away from the image side along the optical axis during zooming. The first lens group is moved for focusing, and the second lens group is moved for zooming.

Abstract: An optical lens includes a first lens group having negative refractive power, a second lens group having positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A total number of lenses of the two lens groups is less than 9. The first lens group has at least three lenses with refractive power and at least one aspheric lens. The second lens group has at least three lenses with refractive power and at least one aspheric lens. The first lens group includes a lens having positive refractive power and an Abbe number of smaller than 20.

Abstract: A lens including a first lens group and a second lens group is provided. The first lens group is disposed between a magnified side and a minified side. The second lens group is disposed between the first lens group and the minified side. The lens includes six or less lens elements, and at least four of the six or less lens elements are aspheric lenses. A field of view of the lens is in a range between 100 degrees and 165 degrees, and the second lens group has at least one spherical lens.

Abstract: A zoom lens includes a first lens group, a second lens group, a third lens group, a fourth lens group and an aperture. The first lens group, the second lens group, the third lens group and the fourth lens group are sequentially arranged in a direction. The aperture is located between the second lens group and the third lens group. When the zoom lens performs a zoom operation, the first lens group and the third lens group are fixed and the second lens group and the fourth lens group are moved, and a moving distance of the fourth lens group on an optical axis of the zoom lens is less than 5 mm.

Abstract: A lens including a first lens group and a second lens group is provided. The first lens group is disposed between a magnified side and a minified side. The second lens group is disposed between the first lens group and the minified side. The lens includes six or less lens elements, and at least four of the six or less lens elements are aspheric lenses. A field of view of the lens is in a range between 100 degrees and 165 degrees, and the second lens group has at least one spherical lens.

Abstract: On embodiment of the invention discloses an optical lens including five lens group and an aperture stop. Each lens group includes at least one lens with refractive power, and the aperture stop is fixed in a position between a second lens group and a third lens group. Further, a distance between a first lens group and a fifth lens group remains fixed during zooming or focusing, and respective distances of the second lens group and a fourth lens group relative to the fifth lens group vary during zooming or focusing.

Abstract: A zoom lens includes a first lens group, a second lens group, a third lens group, a fourth lens group and an aperture. The first lens group, the second lens group, the third lens group and the fourth lens group are sequentially arranged in a direction. The aperture is located between the second lens group and the third lens group. When the zoom lens performs a zoom operation, the first lens group and the third lens group are fixed and the second lens group and the fourth lens group are moved, and a moving distance of the fourth lens group on an optical axis of the zoom lens is less than 5 mm.

Abstract: An optical lens includes a first lens group having negative refractive power, a second lens group having positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A total number of lenses of the two lens groups is less than 9. The first lens group has at least three lenses with refractive power and at least one aspheric lens. The second lens group has at least three lenses with refractive power and at least one aspheric lens. The first lens group includes a lens having positive refractive power and an Abbe number of smaller 20.

Abstract: An imaging lens including a first lens group, a second lens group, and an aperture stop is provided. The first lens group is disposed between an object side and an image side. The second lens group is disposed between the first lens group and the image side. The aperture stop is disposed between the first lens group and the second lens group. The imaging lens includes at least three cemented lenses, each of the cemented lenses includes at least one lens having non-zero refractive power, and at least one lens of each of the cemented lenses has an Abbe number greater than 80.

Abstract: On embodiment of the invention discloses an optical lens including five lens group and an aperture stop. Each lens group includes at least one lens with refractive power, and the aperture stop is fixed in a position between a second lens group and a third lens group. Further, a distance between a first lens group and a fifth lens group remains fixed during zooming or focusing, and respective distances of the second lens group and a fourth lens group relative to the fifth lens group vary during zooming or focusing.

Abstract: An imaging lens including a first lens group, a second lens group, and an aperture stop is provided. The first lens group is disposed between an object side and an image side. The second lens group is disposed between the first lens group and the image side. The aperture stop is disposed between the first lens group and the second lens group. The imaging lens includes at least three cemented lenses, each of the cemented lenses includes at least one lens having non-zero refractive power, and at least one lens of each of the cemented lenses has an Abbe number greater than 80.

Abstract: A zoom lens arranged along an optical axis includes a first lens group and a second lens group. The second lens group has at least one aspheric lens. The first lens group moves toward an image side and the second lens group moves away from the image side along the optical axis during zooming. The first lens group is moved for focusing, and the second lens group is moved for zooming.