Contrast Issues
The illumination from any light source falls off with distance, which is fairly obvious if you think of a flashlight aimed out into the dark, or the way a room looks when only one table lamp is switched on.
In daylight photography this is not a consideration, because of the great distance of the sun. Any difference between the sunlight reaching a mountain top and that at sea level is insignificant compared with the 93 million miles between the sun and earth. Photography by any kind of artificial lighting, which covers the majority of most peoples’ low light shooting, has to deal with a very different distribution of illumination.
The light fall-off from a point source of light, such as a bare bulb, follows a simple law. It fades ...
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