Patent ID: 8134787

Claim:
A super-wide angle lens comprising: a four-group, five-element constitution which includes one cemented lens composed of two lens elements, wherein at least four of the five lens elements are plastic lenses, two of the plastic lenses are cemented to form the cemented lens, at least six lens faces of the four plastic lenses are aspherical surfaces, and one of the aspherical surfaces is formed on a cemented surface of the cemented lens, and wherein following conditional expressions (a) through (e) are satisfied. | X θ /Ro|≧ 1.13 (a) |(θ/2)/ Ro|≧ 1.59 (b) |(θ/2)/ X θ |≦1.41 (c) f≦1.1 (d) α≧180° (e) where θ: Effective diameter of the cemented surface X θ : Aspherical surface amount at the effective diameter “θ” of the cemented surface Ro: Center curvature radius in the cemented surface f: Focal length of the super-wide angle lens, and α: Horizontal angle of view of the super-wide angle lens.