I found this thread after noticing a similar problem with my 201f and having checked the inside where I found a piece of "tape". It is black and seems to have been hanging from the top just in front of the shutter curtain but has been somehow ripped and fallen down. So far its lack doesn't seem to affect the images. Can someone tell me what exactly it is and how it might affect camera operation? Hope it is OK if I start a new thread in case nobody answers here (not sure how forums work, sorry).