Optical lens system

An optical 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 having a concave object-side surface and a concave image-side surface;
• a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
• a fourth lens element having a concave object-side surface and a convex image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric;
• and
• a fifth lens element having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one inflection point being formed on the image-side surface, and made of plastic,
• wherein the optical lens system is further provided with a stop disposed between an object and the third lens element, and an electronic sensor disposed at an image plane for the image formation of the object;
• a focal length of the optical lens system is f;
• a focal length of the third lens element is f3;
• a distance on an optical axis between the stop and the electronic sensor is SL;
• a distance on the optical axis between the object-side surface of the first lens element and the electronic sensor is TTL;
• a radius of curvature of the object-side surface of the fifth lens element is R9;
• a radius of curvature of the image-side surface of the fifth lens element is R10;
• an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, and they satisfy the following relations:
• 0.00<f/f3<0.80;
• 0.7<SL/TTL<1.2;
• |R10/R9|<0.8;
• and
• 32.0≦V1−V2<42.0.