- Source: Pinspeck camera
A pinspeck camera is the optical reverse of a pinhole camera: a small (point-like) obstruction (the speck) is placed in front of the film where the (pin) hole would be in a pinhole camera. (The dark screen is “replaced” by the transparent nothing around the speck.)
Whereas in a pinhole camera the hole allows rays of light from different parts of the scene to reach different parts of the film, the obstruction in the pinspeck camera causes the shadow of different points in the scene to fall on different points on the film. The result is a negative image.
External links
Jearl Walker The Pleasure of the Pin Hole Camera and Its Relative the Pinspeck Camera
Adam Lloyd Cohen Anti-pinhole imaging Optica Acta: International Journal of Optics Volume 29, Issue 1, 1982
Antonio Torralba and William T. Freeman Accidental Pinhole and Pinspeck Cameras
M. Young Quantum noise limits the pinspeck camera to simple objects
