fschifano
Member
I suppose a good way to test this would be to sacrifice a sheet of film, load it into the camera and pull the dark slide. Either leave it in direct sunlight for ten minutes or so, or spend some time passing a powerful flashlight around every crevasse of the camera and film holder. Develop the film to see if theres anything other than a blank negative.
Oh no, don't sacrifice a sheet of film for this. A cheap piece of enlarging paper cut to size to fit the holder will work just fine for this test. Trust me. I check my holders regularly like this using the cheapest paper I can find.