A camera lens includes, lined up from the object side to the image side, 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 satisfies specific conditions.
1. A camera lens comprising, lined up from the object side to the image side, 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 has properties meeting following conditions (1)-(3):
1.10≦ F 1/ F≦ 1.25 (1)
−3.50≦ F 2/ F≦− 2.50 (2)
−1.20≦( R 1+ R 2)/( R 1− R 2)≦−0.65 (3)
In which
F: Overall focal distance of the lenses
F1: The focal distance of the first lens
F2: The focal distance of the second lens
R1: The object side curvature radius of the first lens
R2: The image side curvature radius of the first lens.
2. The camera lens according to claim 1 further satisfying the following condition (4):
0.55≦ F 3/ F≦ 0.75 (4)
In which
F: Overall focal distance of the lenses
F3: The focal distance of the third lens.
3. The camera lens according to claim 1 further satisfying the following condition (5):
−0.85≦ F 4/ F≦− 0.65 (5)
In which
F: Overall focal distance of the lenses
F4: The focal distance of the fourth lens.
4. The camera lens according to claim 1 further satisfying the following condition (6):
0.05≦ D 4/ F≦ 0.13 (6)
In which
F: Overall focal distance of the lenses
D4: The axial distance between the image side of the second lens and the object side of the third lens.