| 摘要 |
Including: a front group Gf disposed to an object side of an aperture; and a rear group Gr disposed to an image side of the aperture; the front group including a sub group Ga having negative power, the sub group including, from the object side, at least three negative lenses, at least one of the three negative lens being an aspherical negative meniscus lens having a shape that negative power is getting smaller from the center to the periphery, a cemented lens constructed by a positive lens, a negative lens and a positive lens disposed to the image side of the sub group, an antireflection coating being applied on at least one surface of the front group, the antireflection coating including at least one layer formed by a wet process, and given conditions being satisfied, thereby providing a wide-angle lens having high optical performance with a large angle of view. |
