Camera lens

1. A camera lens comprising, arranged sequentially 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 negative refractive power;

a fourth lens with positive refractive power;

a fifth lens with positive refractive power; and

a sixth lens with negative refractive power; wherein

the camera lens satisfies following conditions (1)˜(4):

−100.00≦ f 3/ f≦− 25.00  (1)

2.00≦ f 4/ f≦ 15.00  (2)

0.50≦( R 3+ R 4)/( R 3− R 4)≦2.00  (3)

0.50≦( R 5+ R 6)/( R 5− R 6)≦20.00  (4)

where,

f: overall focal distance of the camera lens;

f3: focal distance of the third lens;

f4: focal distance of the fourth lens;

R3: curvature radius of the second lens' object side surface;

R4: curvature radius of the second lens' image side surface;

R5: curvature radius of the third lens' object side surface;

R6: curvature radius of the third lens' image side surface.

2. The camera lens as described in claim 1 further satisfying following condition (5):

−2.00≦( R 1+ R 2)/( R 1− R 2)≦−1.00  (5)

where,

R1: curvature radius of the first lens' object side surface;

R2: curvature radius of the first lens' image side surface.

3. The camera lens as described in claim 1 further satisfying following condition (6):

0.50≦( R 7+ R 8)/( R 7− R 8)≦3.00  (5)

where,

R7: curvature radius of the fourth lens' object side surface;

R8: curvature radius of the fourth lens' image side surface.