I wondered if I could use these for a pinhole camera, so bought them first, then read about it later (usual approach!)
I found an interesting post on http://photo-analogue.blogspot.co.uk/2014/04/talking-about-pinhole-photography-with.html that shows these will work with the correct approach so going to give them a go.
I found an interesting post on http://photo-analogue.blogspot.co.uk/2014/04/talking-about-pinhole-photography-with.html that shows these will work with the correct approach so going to give them a go.