| 摘要 |
PROBLEM TO BE SOLVED: To provide a wide-angle lens that allows for reducing various aberrations and specifying a relatively large absolute value of a curvature radius of a cemented surface of a cemented lens even when the cemented lens is disposed on the image side L2 of an aperture stop.SOLUTION: A wide-angle lens 100 has a five-group six-lens configuration, where a first lens 110 and a second lens 120 have negative power, and a third lens 130 and a fourth lens 140 have positive power. A fifth lens 150 is a plastic lens having a concave surface on the object side L1, a concave surface on the image side L2, and negative power, and a sixth lens 160 is a plastic lens having a convex surface on the object side L1, a convex surface on the image side L2, and positive power. An aperture stop 190 is located between the third lens 130 and fourth lens 140. The fifth lens 150 and sixth lens 160 are cemented together.SELECTED DRAWING: Figure 1 |
