I developed my first roll of 120 a few days ago. I noticed a vertical "band" in 4 of the 12 exposures (exposures #4, 6, 9, and 10). I can't be sure, but I don't think it's caused by the camera because the shots used different apertures and shutter speeds. On the other hand, I'm not convinced it's caused by the developer either because the exposures would either have this "band" or not have it entirely. So could this have been caused by the developing process?