I wanted to post a little experiment which I'm sure many of you may have already tried, I'll be posting some results following this submission. Basically I made a pinhole cap originally, taking as usual a body cap and putting a foil-based pinhole in front. But I did not like how the body cap did not fit so snug nor at the time could I keep the foil too protected. So I ended up getting a Canon EF T-Mount Adapter and I put a clear filter in front ( to which I later removed because it was impacting the image quality ) and taped in a sheet of foil that had been rotated down with a nickel so that I could find the true center based on where the circles intersected. Originally I was just going to try this on the EOS-1, but then I Remembered that technically speaking the field of view of a pin hole varies on how far from the film plane it is, so got me to thinking what if I put film into a rear lens cap and end up with possibly a 16mm pocket pinhole camera, thus what happened above. Submissions of test results coming after this.