| 摘要 |
An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a biconcave negative single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented to form a cemented lens. The imaging lens is configured to satisfy conditional expressions (2): 0<fg2/f<1.3, (2b′): 0.5<fg2/f<1.25, and (6): 31<&ngr;d2<70 at the same time, where fg2 is combined focal length of the second lens group, f is focal length of the entire lens system, and &ngr;d2 is Abbe number of the second group first lens. |
