Okay – you’ve made your pinhole camera and now it’s time to photograph with it. A lot of this depends on your camera and how well you built it. The biggest factor is the size of the pinhole. If your pinhole was bigger (about 0.75mm), then the aperture size is around f/55. If the pinhole was really small (about 0.30mm), then the aperture size is about f/160. If it was in the middle somewhere (about 0.50mm), then it’s about f/128.
Below is a chart for the exposure times. The methodology can be this: Take your camera with you and set the ISO to 100. Then read the shutter speed needed by your camera. Follow the chart to the right, chose the size that you think is closest to the measurement of your pinhole, and then figure out the exposure.(more…)