Optical image capturing lens system

An optical image capturing lens 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 negative refractive power made of plastic material, wherein both of an object-side surface and an image-side surface of the second lens element are aspheric;
• a third lens element with positive refractive power, wherein an object-side surface and an image-side surface of the third lens element are aspheric;
• and
• a fourth lens element with refractive power made of plastic material and having a concave image-side surface, wherein an object-side surface and the image-side surface of the fourth lens element are aspheric, and the fourth lens element has at least one inflection point formed on the image-side surface thereof;
• wherein the optical image capturing lens system has a total of four lens elements with refractive power, a distance perpendicular to an optical axis between the inflection point on the image-side surface of the fourth lens element and the optical axis is Yc42, an effective radius of the image-side surface of the fourth lens element is SD42, a maximum effective radius of the surfaces of the first through fourth- lens elements is SDmax, and a minimum effective radius of the surfaces of the first through fourth lens elements is SDmin, a focal length of the optical image capturing lens system is f, and an entrance pupil diameter of the optical image capturing lens system is EPD, the following relationships are satisfied:
• 0.2<Yc42/SD42<0.95;
• 1.0≦SDmax/SDmin<2.0;
• and
• f/EPD<1.9.