Hello, i got a Pentax 645 N with a 75mm lens from a friend. I bought new batteries, fresh film and the camera works great without film in it. As soon as i insert film ( i am sure i did it right ... i followed all the steps in the manual and watched videos) the film winds up a bit and the display says E ( Not Err ). the manual says this means the film is not loaded correct. I tried this at least 15 times now, i changed the batteries again too. The camera winds up the paper of the film easylie, then makes some heavier sounds and mostly stops when the actual film is about to wind over the edge of the pressure plate. I read through all the forums, but noone has the same problem. its not the double exposure lever, i checked for that. also i tried 3 typs of different films. its not that either. I cleand everything which looked like a contact with alcohol. but i could really not tell which parts exactly tell the camera that the film is not inserted correct. maybe someone can help me with this issue. i really like the disgn of the camera, its really practical and i would love to shoot with it. thanks for the help in advance !