Patent ID: 8842375

Claim:
An image capturing 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 at a paraxial region; a second lens element having refractive power; a third lens element having refractive power; a fourth lens element with negative refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; and a fifth lens element with refractive power having a concave image-side surface at a paraxial region, wherein an object-side surface and the image-side surface of the fifth lens element are aspheric, and the shape of the image-side surface of the fifth lens element changes from concave at the paraxial region to convex at a peripheral region; wherein the image capturing system has a total of five lens elements with refractive power, an axial distance between the first lens element and the second lens element is T12, a central thickness of the second lens element is CT2, an axial distance between the third lens element and the fourth lens element is T34, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and the following relationships are satisfied: 1.08 <T 12 /CT 2<3.0; 1.08 <T 12 /T 34<3.0; and 0 <|f 4 /f 5|<0.50.