Patent ID: 8116013

Claim:
A wide-angle lens having a viewing angle of more than 130°, the wide angle lens having arranged therein a front group, an aperture, and a rear group in this order from an object side to an image side, the front group having arranged therein a first lens as a negative lens, a second lens as a negative lens, and a third lens as a positive lens from the object side to the image side, the rear group being a cemented lens having a positive power when two lenses are bonded to each other, wherein the wide-angle lens includes an image forming system with the five lenses as a whole, the first lens and the second lens of the front group are aspherical lenses, and the third lens is a spherical lens, wherein: the rear group is composed of a positive lens and a negative meniscus lens, and an Abbe's number vdL of a material of the negative meniscus lens meets a condition vdL <21, and the rear group has arranged therein a fourth lens as the negative meniscus lens and a fifth lens as the positive lens from a side of the aperture to the image side, and the wide-angle lens has a viewing angle of more than 190°.