<p>Hi all,<br /> I'm having a problem with my Hasselblad 500CM. I have two different film backs. On two of my reels that I've processed, there is an extremely distinctive, large, black rectangle that appears in the exact same position. I do not know the cause and it does not appear on every reel! <br /> Here are two examples:<br />
/> https://www.flickr.com/photos/katoch/27866434663/in/photostream/<br /> Any advice identifying the cause would be greatly appreciated!</p>