Patent attributes
A wide-angle lens system includes a negative first lens group, a negative second lens group, and a positive third lens group. The negative first lens group includes at least two negative meniscus lens elements each having the convex surface facing toward the object, and a positive lens element provided on the image-side of the two negative meniscus lens elements. The negative second lens group includes cemented lens elements and a negative meniscus lens element having the convex surface facing toward the object. The wide-angle lens system satisfies the following conditions:f2-3/f>1.6 (1)f3/f>1.5 (2)(f2-3/f)/(f3/f)>1.0 (3)whereinf2-3 designates the combined focal length of the negative second lens group and the positive third lens group;f designates the focal length of the entire wide-angle lens system; andf3 designates the focal length of the positive third lens group.
