Zoom lens

A zoom lens comprising a first lens group, a second lens group, a third lens group and a fourth lens group, all of which are arranged in sequence from an object side to an image side along an optical axis, wherein:

• the first lens group is with positive refractive power;
• the second lens group is with negative refractive power;
• the third lens group is with positive refractive power;
• the fourth lens group is with positive refractive power;
• an interval between the first lens group and the second lens group is changeable, an interval between the second lens group and the third lens group is changeable and an interval between the third lens group and the fourth lens group is changeable when the zoom lens zooms from wide-angle end to telephoto end;
• and
• the first lens group comprising a first lens and a second lens, both of which are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens group and the first lens satisfy the following condition:
• −1.2<fG1/f1<−0.58, wherein fG1 is an effective focal length of the first lens group and f1 is an effective focal length of the first lens.