An optical zoom lens comprises a first lens group of negative optical power, a second lens group of positive optical power and a third lens group of positive optical powder, from the object side to the image side. The optical zoom lens meets following conditions: -0.45W/f₁<-0.3 and 0.42/f₁<0.8, wherein FW is the minimum effective focus of the optical zoom lens, f1 is the focus of the first lens group and f2 is the focus of the second lens group.