4/1/09

A pinehole camera whatitis?


Warning!  Drugs are unnecessary to view the following pics !


here the guilty: a simple Barilla Pasta box and 2mm hole in front 

A pinhole camera is a very simple camera with no lens and a single very small aperture. Simply explained, it is a light-proof box with a small hole in one side. Light from a scene passes through this single point and projects an inverted image on the opposite side of the box. Cameras using small apertures, and the human eye in bright light both act like a pinhole camera.


The smaller the hole, the sharper the image, but the dimmer the projected image. Optimally, the size of the aperture should be 1/100 or less of the distance between it and the screen.

A pinhole camera's shutter is usually manually operated because of the lengthy exposure times, and consists of a flap of some light-proof material to cover and uncover the pinhole. Typical exposures range from 5 seconds to hours and sometimes days.
A common use of the pinhole camera is to capture the movement of the sun over a long period of time. This type of photography is called Solargraphy.

A good book here 

2 comments:

RED JACK said...

grrrr que c'est beaux

franck said...

système inventé par Nicephore Niepce..
sous le nom de caméra Obscura !