A four-piece optical lens system includes, in order from the object side to the image side: a stop; a first lens element with a positive refractive power; a second lens element with a negative refractive power; a third lens element with a positive refractive power; a fourth lens element with a negative refractive power, wherein a focal length of the first lens element and the second lens element combined is f12, a focal length of the third lens element is 13, and they satisfy the relation: 0.6