Attached is an image taken with a cell phone camera, shot through a magnifier, of a negative from one of the first rolls I shot through my new Bronica S2A. The film is Delta 400. Can anyone tell me the likely cause of these black streaks/smudges? I did not get these on a roll of HP5+ I shot through the same camera and processed the same way, but that WAS in a different back. Could this be a result of gunk on the rollers, or light leaks? It doesn't LOOK like light leaks... Anyway, thanks for any help you can provide.  Forgot to mention: These streaks are present most strongly in the first quarter or so of the film, and are more or less completely gone by the last three frames.