Why can't I get a wide-angle effect with a wide-angle lens? How to use it?

D80 is not Quan Huafu's camera. The real focal length should be multiplied by 1.5 times. The lens of 18- 135 does have a wide angle when mounted on the D80 fuselage (the camera of 135 has a wide angle below 35MM).

Generally, the so-called wide-angle effect refers to the perspective deformation that is near to large and far from small. The specific method is very simple, as long as the wide-angle end is as close to the subject as possible when shooting.