Patent ID: 8270099

Claim:
A lens system, in an order from the object side thereof to the image side thereof, comprising: an aperture stop; a first lens having a positive refractive power, the first lens having a first object-side surface and a first image-side surface; and a second lens having a positive refractive power, the second lens having a second object-side surface and a second image-side surface; wherein the lens system satisfies the following formulae: R max /TTL>0.97; and 0.31<G 1 R 1 /F 1 <0.33, wherein R max denotes the largest imaging circle diameter of the lens system, TTL denotes the total track length of the lens system, G 1 R 1 denotes the curvature radius of the vertex of the first object-side surface, and F 1 denotes the focal length of the first lens.