The only modern camera that I've experience with that sensed weather the film loaded or not is the zx-m. If film is loaded and it isn't advancing the shutter still fires, the camera just doesn't count frames. If I remember correctly this is consistent with many other older model cameras that I've handled. Even in this age where camera manufactures try to idiot proof everything the cost of doing so would be prohibitive. Most cameras will probably set the correct aperture and shutter speed and auto focus regardless of correct film insertion. (Those few that did fail to fire without film could be fooled by a cardboard insert, many came with one).
At 09:42 AM 9/19/2002 +0100, you wrote: >Hi, > >Jostein wrote: > > > However, the check for presence of film doesn't start until the back > lid is shut. > >Surely the (correctly loaded) presence of film is detected by >the toothed wheels to the right of the film gate? If these turn >when the advance motor is working, film is loaded and the camera >will fire. If they don't, the film is misloaded or not present >and it will not. > >I don't see how the insert will overcome this. It will be much >easier to deal with those units which use LEDs to monitor film >movement. > >mike
