Photographic Lens Optical System

Abstract

A photographic lens optical system includes: a first lens having a negative refractive power and a meniscus shape convex toward an object side; a second lens having a positive refractive power and a shape convex toward an image side; a third lens having a positive refractive power and a double convex shape; and a fourth lens having a negative refractive power and a shape convex toward the image side, wherein the first to fourth lenses are sequentially arranged in a direction from the object side to the image side, and the photographic lens optical system satisfies the following condition: 0.15<|(tan θ)/f|<0.25 where θ and f denote an angle of view and a focal length of the photographic lens optical system, respectively.

Dependencies are inferred from the claim text.