| 摘要 |
PURPOSE:To reduce the difference between the abberations of distorted surfaces by constituting the 5th lens component of four lenses in three groups or four lenses in four groups consisting of a tablet consisting of a positive single lens and a negative single lens successively arranged from the object side, a negative single lens and a positive single lens. CONSTITUTION:The 1st lens component is constituted of three lenses in two groups consisting of a tablet consisting of a negative meniscus single lens turning its convex surface to the object side and a positive meniscus single lens turning its convex surface to the object side successively arranged from the object side, and a positive meniscus single lens turning its convex surface to the object side. The 5th lens component is constituted of four lenses in four groups consisting of a negative meniscus single lens turning its strong convex surface to the object side, a negative meniscus single lens turning its concave surface to the object side, a negative meniscus single lens turning its concave surface to the image side, and a positive single lens. Thus, the use of the separated tablet makes it possible to reduce the difference between the abberations of distorted surfaces from a wide angle and to a telephoto end. |
