Hello, all. For my photography class, our first assignment was to design a pinhole camera. We're using these things now and it seems like getting the exposure right is very tricky. Normally if I don't have a light meter, I try and follow the "Sunny 16" rule (shutter speed = 1/film speed, aperture = f/16). However, we're not using film for our pinhole cameras; we're using photo paper instead...Ilford multigrade RC paper to be exact. Is there a way to determine exposure time for photo paper? I calculated the f-stop of my pinhole camera to be approx. f/460 (6.5 in / 0.014 in). Thanks in advance.