The present invention discloses a camera lens composed of 4 ultrathin and high-luminous flux wide angle lenses with excellent optical properties. The lenses are lined up in turn from the object side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power. The camera lens meets specific conditions.
1. A camera lens, comprising, lined up in turn from the object 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;
wherein the camera lens satisfies the conditions as follows:
0.90≦ f 1/ f≦ 1.00,
−3.50≦ f 2/ f≦− 2.00,
−0.80≦( R 1+ R 2)/( R 1− R 2)≦−0.30,
1.80≦( R 3+ R 4)/( R 3− R 4)≦3.00,
0.15≦ d 4/ f≦ 0.25,
where, f is the overall focal distance of the camera lens;
f1 is the focal distance of the first lens;
f2 is the focal distance of the second lens;
R1 is the object side curvature radius of the first lens;
R2 is the image side curvature radius of the first lens;
R3 is the object side curvature radius of the second lens;
R4 is the image side curvature radius of the second lens; and
D4 is the axial distance from the image side of the second lens to the object side of the third lens.
2. The camera lens as described in claim 1 further satisfying the following conditions:
0.50≦ f 3/ f≦ 0.70
where, f is the overall focal distance of the camera lens, and f3 is the focal distance of the third lens.
3. The camera lens as described in claim 1 further satisfying the following conditions:
−0.75≦ f 4/ f≦− 0.55
where, f is the overall focal distance of the camera lens, and f4 is the focal distance of the fourth lens.