I'm guessing you guys will be able to tell me what these are right away, but I've ever seen them before. You'll notice it looks like someone drove a density blob pizza cutter up and down my film . TX in d-76. My hint is that I have a new 4 reel tank, and I'm guessing it's the culprit. B/c some rolls were fine (the ones from my old tank?) and some were bad, usually worse on the first half of the film, or the end furthest out on the reel. The new tank has about 3/4 of an inch of play for the reels, which I'd never encountered before, so I further guess these are swirl patters...but they still look odd to me. If that's what you guys suppose it is, does anyone have any suggestions for a stopper to hold the reels? If they don't look like that, other ideas? Thanks!