an optical image capturing system , from an object side to an image side , comprises a first lens , a second lens , a third lens , a fifth lens , and a sixth lens elements . the first lens element with refractive power has a convex object - side surface . the second through fifth lens elements have refractive power and both of an object - side surface and an image - side surface of the four lens elements are aspheric . the sixth lens with refractive power has a concave image - side surface . both of the image - side and object - side surfaces of the six lens elements are aspheric and at least one of the two surfaces has inflection points . each of the six lens elements may have refractive power . when satisfying specific conditions , the optical image capturing system can have a larger incoming light quantity and a better optical path adjusting ability to acquire better imaging quality .