Recently shot 800 ft of film for a project. There are "flashes of light" at angles, usually blue or red that appear 5 frames before the end of every shot. While shooting indoors this only happened right before the end of our shots. Once we went outside it happened throughout the shots.
A reshoot was done with the same camera and the same streaking problem occurred. Just like Grants.
The camera and mag were both gaff taped. Could this be a light leak on the prism/Dog Leg Adapter?
http://www.flickr.com/photos/37565169@N08/?saved=1