Patent ID: 8427760

Claim:
An image capturing optical system comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface; and a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, wherein the object-side surface and the image-side surface of the third lens element are aspheric, and the third lens element is made of plastic material; wherein the image capturing optical system has a total of three lens elements with refractive power, a focal length of the image capturing optical system is f, a focal length of the second lens element is f2, and they satisfy the following relationship: 1.2 <f/f 2<2.4.