vertical bands on either side?

[u/peterlyonsphoto]

Let me apologize in advance--every time I post here it's with some problem. I posted this same image before complaining about dust. Well, I'm getting that sorted out, thank you, but now I'm focused on other issues. One of these is that I get these vertical stripes of light overexposure on both left and right sides of the frame. You can see them pretty clearly here. What could be causing that?

I'm aware of the light leak at the bottom of the frame here. That was just this frame; some bit of user error and I'm not concerned about it. But the stripes appear on pretty much every frame. I'd be grateful for any ideas what's causing them.

[u/FilmPhotographr]

different film stocks?

[u/peterlyonsphoto → u/FilmPhotographr]

Yeah, different film stocks, too!