I came to shoot today and turned the camera on. There came a strange sound from the lens, a very bad sound actually. The camera would not focus, in the display the aperture indicates c as for closed, the zoom goes back and forth electronically not mechanically (z number changes randomly). It seems that there is no contact between body and lens. I demounted the lens, put it back on, it appeared a strange vignetting in the upper left corner. Can anybody help me? Is the lens broken? Or is it a humidity problem, contact problem?