Patent ID: 7515351

Claim:
An inverse telephoto with correction lenses comprising five lens elements with refractive power, from the object side to the image side: a first lens element with negative refractive power having a concave image-side surface; a second lens element with positive refractive power having a convex image-side surface; a third lens element with a convex object-side surface; a fourth lens element with a concave image-side surface; a fifth lens element with positive refractive power having a convex image-side surface, at least one of surfaces of the fifth lens element being aspheric; and an aperture stop located between the first lens element and the second lens element; in the optical lens system, at least three of the surfaces of the first, second, third, fourth and fifth lens elements are aspheric; an object to be photographed is imaged on an electronic sensor, a total track length of the optical lens system is TTL, an image height of the optical lens system is ImgH, and they satisfy the relation: TTL/ImgH <4.75.