I made a new pinhole camera the other day from a rectangular box I found - it was just missing a back. I drilled three holes in the front and put a pinhole behind each. My question is, what would be the best way to expose the image? I could either build something to uncover all three at the same time or I could expose one pinhole, cover it back up, then expose the next,...etc. I'm thinking the two different methods would produce different results. Maybe doing it one at a time would produce a sharper image because the light from the other pinhole(s) isn't interfering. Any input would be great - thanks.