Horizontal flashes on film

[pip]

I am developing black and white film in the Lomo tank with the Foma reversal kit. Recently, I have noticed random white flashes when the film is projected. These are not tramlines along the length of the film, but odd frames which have a narrow horizontal flash of white light. They can be detected by eye on the film. They are always horizontal and usually only one flash per frame, so that other frames close by are unaffected. On one reel there was more than one such flash on affected frames and there were a cluster of such affected frames which I believe were towards the centre of the spiral. I wonder if the hole in the centre of the Lomo tank is at fault, although I have mine taped over. I pull the film quite firmly through a damp chamois after processing, but I would have expected to see tramlines if this were the reason.

[slashmaster]

I've had that problem before. Sounds like a light leak in the camera. Was this double 8? 16mm? What camera was this?

[pip]

The problem does not arise in the camera, because I have the same problem with different cameras.

[7OSE9]

You can post some screens? Perhaps after an amateur telecine
I've seen, in my shots, similar things with Orwo UN54, but only in 16mm, using a Krasnogorsk 3. In my case, the fact is attributable, according to many, just at light leak in the camera.
In your case It could be the development, sometimes I read about artifacts problems with Fomapan and Foma kit.

[doug]

Nothing to do with static I suppose, when loading ?

[Davideo]

I've run into this issue before when using reflex cameras. Light leak into the eyepiece for the viewfinder is one cause. Need to keep it covered while shooting.

[Jonathan Guilbert]

I've had this problem many years ago with a Bolex wind-up camera and Kodachrome. Static electricity build up in the gate as the film past through, discharging across to earth intermittently causing random horizontal flashes across certain frames. Never solved the problem. I read an article about the same issue when Spielberg was shooting Schindler's List, with static flashes on black and white film. They put a wet cloth inside the camera door.

[pip]

Definitely not a light leak in the camera because it doesn't appear on colour film shot in the same camera.

[Davideo]

Ok. Do the process of elimination in diagnosing this problem. Shoot a black and white roll in that camera and ship to to an outside lab and see if the problem persists. If it goes away, then there's something wrong with the tank and not the camera.