Camera lens
A camera lens is disclosed. The camera lens includes four piece ultra-thin and wide angle lenses with excellent optical properties and with chromatic aberration sufficiently corrected as follows: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with positive refractive power; a fourth lens with negative refractive power; which are arranged sequentially from object side. The camera lens is characterized in that it meets specified conditions.
1. A camera lens comprising, in an order from an object side to an image side:
a first lens with positive refractive power;
a second lens with negative refractive power;
a third lens with positive refractive power;
a fourth lens with negative refractive power which are arranged sequentially from object side; wherein the camera lens satisfies the following conditions (1)˜(5):
1.08≦ f 1/ f≦ 1.25 (1);
−4.30≦ f 2/ f≦− 2.15 (2);
−0.88≦ f 4/ f≦− 0.56 (3);
−2.00≦( R 1+ R 2)/( R 1- R 2)≦−1.25 (4);
−4.00≦( R 3+ R 4)/( R 3− R 4)≦−0.20 (5);
where,
f: overall focal distance of the camera lens;
f1: focal distance of the first lens;
f2: focal distance of the second lens;
f4: focal distance of the fourth lens;
R1: curvature radius of the first lens' object side surface;
R2: curvature radius of the first lens' image side surface;
R3: curvature radius of the second lens' object side surface;
R4: curvature radius of the second lens' image side surface.
2. The camera lens as described in claim 1 further satisfying the following condition (6):
0.50≦ f 3/ f≦ 0.75 (6);
where,
f: overall focal distance of the camera lens;
f3: focal distance of the third lens.