Optical system for taking image

An optical system for taking image comprising three lens elements with refractive power, from the object side to the image side:

• a first lens element with positive refractive power having at least one aspheric surface;
• a second lens element with negative refractive power;
• a third lens element with negative refractive power having at least one aspheric surface;
• wherein the second lens element and the third lens element are made of plastic material, and the front surface and the rear surface of the second lens element and the third lens element are aspheric;
• the front surface and the rear surface of the first lens element, the second lens element and the third lens element are aspheric;
• the first lens element has a convex front surface and a concave rear surface, the second lens element has a concave front surface and a convex rear surface, the third lens element has a convex front surface and a concave rear surface, and the third lens element is formed with at least one inflection point;
• an aperture stop is located in front of the first lens element;
• a focal length of the third lens element is f3, a focal length of the optical system is f, they satisfy the relation:
• |f/f3|>0.2;
• an Abbe number of the second lens element is V2, and it satisfies the relation:
• V2<24.