Definitions for "Pinhole camera"
Keywords:  obscura, camera, lens, tight, aperture
A spy camera with a lens that can see through a tiny hole. These camera are usually hidden.
A camera that uses a very small hole, as if made by a pin instead of a lens, for light to enter and form an image on the film or other light-sensitive medium. See Pinhole camera.
A camera without a lens, just a light tight box with a small hole at one end. (see Camera obscura)
Keywords:  stduy, sun, safe, easy, simple
a safe and easy way to stduy the Sun
a very simple means of projecting an image - and will usually show a very good image of the Sun
Keywords:  pit, pitch, firing
Pit Firing Pitch