<p>The shutter button is not stuck.<br /> The multiple exposure lever is activated when I have no film, but else it's deactivated.<br /> I can only remove the lens when the crank is in a spot where the mirror is down. If I crank a little bit more the mirror flaps up again and then I can't remove the lens. I also have noticed that the mirror up lever don't give any effect on the mirror. Can you advice how to make sure the lens is attatched correctly? In the position where I can remove the lens I can also put it back. But only at that position.</p>