Hi There I have a Nikon D40 and bought a Speedlite YN460-II and when I attach it to my camera and put it in Auto or portrait mode and take a shot the shutter speed slows right down but if I take flash off shutter speed gos back to normalam I doing something wrong ? when I bought it they told me it was compatible with D40 can any one HELP pleeeeeeese.
L Plater