Hi,

The flare/light leak as shown in this picture:




ruins my negatives occasionally.

It does not happen often and it happens with different film holders so it is not a holder issue.

Lens does not have effect. The picture above has taken with Symmar-S 5.6/150mm and latest picture with similar flare is taken with Symmar-S 5.6/300mm.

The camera is Hasemi (identical with Ikeda Anba and Nagaoka), wooden field camera.
I have checked the bellows and fixed couple of holes, made the fitting of film holder to camera tighter but still this happens.

My best guess is that it's light leak that causes flare only when sun light is hitting just right place.