Patent ID: 7944620

Claim:
A zoom lens, comprising: a first lens group, having a negative refractive power and comprising a first lens, a second lens, and a third lens arranged in order from an object side to an image side, wherein refractive powers of the first lens, the second lens, and the third lens are respectively negative, negative, and positive; and a second lens group, having a positive refractive power and disposed between the first lens group and the image side, the second lens group comprising a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged in order from the object side to the image side, wherein refractive powers of the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are respectively positive, negative, positive, negative, and positive, wherein an effective focal length of the first lens group is f1, an effective focal length of the second lens group is f2, the first lens group and the second lens group are capable of moving between the object side and the image side to make the zoom lens be switched between a wide end and a tele end, an effective focal length of the zoom lens is f w when the zoom lens is switched to the wide end, and −2.8<f1/f w <−2.5 and 0.75<|f1/f2|<0.9.