I recently shot some B+W with my Kiev in very high contrast light at a ruined abbey and on developing noticed some rather odd light streaks across the negatives. Only visible in the dark areas.
The streaks resemble the shape of the metal shutter curtains, so I almost think it could be reflections off the edge of the shutter? If the black coating has worn off perhaps? Can't check that as there's film in it currently.
Any other ideas? It doesn't really bother me, I quite like how the streaks look. Might have to try shooting some colour into bright lights and see how that shows up.