The aperture (S) is immovably arranged between the first and second lens groups and 0.45 is less than Fw/f2 is less than 0.7 (1); 0.5 is less than F2/lf1i is less than 1.0 (2); 0.8 is less than Dw/f2 is less than 1.3 (3) in which Fw is the focus of the complete variable lens in wide angel extremity; F1 is the focus of the first lens group (f1 is less than 0); F2 is the focus of the second lens group (f2 is greater than 0); Dw is the distance of the aperture from the first main point of the second lens group (20) in wide angle extremity. The first lens group (10) contains a positive lens component (l1), which is arranged next to the object and fulfils the following condition0.2 is less than 1f1l/f1-1 is less than 0.7 (4); in which F11 is the focus of the positive lens component in the first lens group (l1) (f1-1 is greater than 0).
