Patent ID: 8643958

Claim:
A wide angle lens whose field angle exceeds 160 degrees, comprising: a front group, an aperture stop, and a rear group, which are arranged in the stated order from an object side toward an image side, wherein the front group includes a first lens that is a negative meniscus lens whose convex surface is facing the object side, a second lens that is a negative lens, a third lens that is a negative lens, and a fourth lens that is a positive lens, which are arranged in the stated order from the object side toward the image side, the rear group includes a fifth lens that is a positive lens, a sixth lens that is a negative lens, and a seventh lens that is a positive lens, which are arranged in the stated order from an aperture stop side toward the image side, wherein the fifth lens and the sixth lens are combined together forming a cemented lens having positive refractive power, the first to seventh lenses form an imaging system including a total of seven lenses, the fifth lens is made of a material having an Abbe number νd5 that is greater than or equal to 50, the sixth lens is made of a material having an Abbe number νd6 that is less than or equal to 30, and a surface of the seventh lens facing the image side is an aspheric surface.