Abstract: An imaging lens includes a first lens with a negative refractive power, a second lens with a positive refractive power, a third lens with a positive refractive power and a fourth lens with a refractive power arranged in order from a first side to a second side, and an aperture stop is disposed between the first lens and the third lens. The first lens, the second lens, the third lens and the fourth lens are made from glass, a total number of lenses with refractive powers in the imaging lens is less than 5, the second lens and the third lens are aspheric glass lenses, and a full field of view of the imaging lens is greater than 120 degrees.

Abstract: An optical lens includes a first lens, a second lens, a third lens, a fourth lens, a first cemented lens and aperture stop. The first lens is closest to a magnified side of the optical lens, one of the second lens and the third lens is a first aspheric lens, and the fourth lens is a second aspheric lens and disposed between the first cemented lens and a minified side of the optical lens. The optical lens has at most two plastic lenses, and the optical lens satisfies the condition of 3.5<D1/DL<5.5, where D1 denotes a lens diameter of the first lens and DL denotes a lens diameter of the fourth lens.

Abstract: An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group includes a first lens and a second lens, and the second lens group includes a third lens and a cemented lens. The aperture stop is disposed between the second lens and the cemented lens, a total number of lenses with refractive powers in the optical lens is less than eight, and the optical lens includes at most three aspheric lenses. The optical lens satisfies the condition 0.9<D1/IM<1.6, where IM denotes an image circle diameter measured on a visible-light focal plane of the optical lens, and D1 denotes a lens diameter of the first lens.

Abstract: An imaging lens includes a first lens with a negative refractive power, a second lens with a positive refractive power, a third lens with a positive refractive power and a fourth lens with a refractive power arranged in order from a first side to a second side, and an aperture stop is disposed between the first lens and the third lens. The first lens, the second lens, the third lens and the fourth lens are made from glass, a total number of lenses with refractive powers in the imaging lens is less than 5, the second lens and the third lens are aspheric glass lenses, and a full field of view of the imaging lens is greater than 120 degrees.