Six-piece optical lens system

A six-piece optical lens system comprising, in order from an object side to an image side:

• a first lens element with a positive refractive power having a convex object-side surface, at least one of the object-side and an image-side surfaces of the first lens element being aspheric;
• a second lens element with a negative refractive power having a concave image-side surface, at least one of an object-side and the image-side surfaces of the second lens element being aspheric;
• a third lens element with a negative refractive power, at least one of an object-side and an image-side surfaces of the third lens element being aspheric;
• a fourth lens element with a positive refractive power having a concave object-side surface, at least one of the object-side and an image-side surfaces of the fourth lens element being aspheric;
• a fifth lens element with a positive refractive power having a convex image-side surface, at least one of an object-side and the image-side surfaces of the fifth lens element being aspheric;
• and
• a sixth lens element with a negative refractive power having a concave image-side surface, at least one of an object-side and the image-side surfaces of the sixth lens element being aspheric;
• wherein a focal length of the six-piece optical lens system is f, a distance from the object-side surface of the first lens element to an image plane along an optical axis is TL, and they satisfy the relation:
• 0.65<|f/TL|<1.