A pinhole camera is a very simple style of camera. It has no lens and a tiny aperture (hole). It is basically a light proofed tin or box with a hole in one side. Photo paper is placed in this box opposite the hole. Light passes through this hole, hits the paper and projects an inverted image.
I made my Pinhole camera out of a Pringles tube as i wanted the curved effect on each of my pictures. The focal length was 70mm and the diameter of the pinhole was 0.8mm. This gives an F stop of 87.5 (rounded up to 90). For my camera to take a decent image outside, the shutter had to be up for 30seconds. For an inside image the shutter had to be up for 5 minutes.
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