So I ordered the wrong size of film. Stupid, I know. But now I have that camera that I want to try and only film that is larger then what I need. I need 6.5x9 cm (but ordered 3.25x4.25 inch). I don't see any on stock that I can have here during my holiday. So the fastest way to have somthing to shoot would be cutting down 4x5. I have a lot of it and if I'm fiddling a bit I can get 2 sheets of 6.5x9 out of a sheet of 4x5. It will turn out at 6.25x9 but I can live with that to test the camera.

Now how do you guys cut film in total darkness? I barely manage to load a development tank.

My tought was to cut 2 pieces of thin MDF or plywood in the size I need. Make a kind of hinge with tape along 1 side. And then cut with a cutter around it.

Assuming I do not cut off a couple of fingers, how do I mark it then to know what is the emulsion side?

Probably stupid questions but I'd like to have some opinions before I try something even more stupid.