Hi Guys.
I have a situation and I can't really figure out where the problem lays. I have a Mamiya RB67 that I try to use, but the negatives are coming out with some funny patterns (see below). I've already changed the light seals, which made the situation better, but still it isn't solved. Where does these pattern come from? They don't really look like light leaks to me, so I suppose I do something wrong while developing, but then there are some completely clear frames.... I'm simply out of my depth. I would really appreciate your input!
Thank you in advance!