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18% assumption, middle grey, zone 5
| Light Glossary |
Light meters "expect" subjects and scenes to reflect 18% of the incident light. mostly they do. tip: what you do when they don`t will affect your image in more ways than one. see: gray card and zone system.
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Available light, английский
- Light of almost any sort which exists and has not been introduced to record images. its use is sometimes fast, cheap, and even beautiful. tip: the more you understand lighting technique, the better prepared you will be to take advantage of the good stuff - when it is available. before committing, what are the odds that it will last as long as your shooting will and that the mood is appropriate? keep a few lights available - in case. also see: natural light.
- The light that`s normal in a scene, although the term is generally used when the light level is low. available light shooting usually involves fast film, low shutter speeds and apertures, and/or the use of a tripod.
Inverse-square law, fall-off, английский
Light from a point source falls-off inversely to the square of the distance. move the light from 10-feet-away to 20-feet-away and you have only 1/4 of the intensity; 40-feet, 1/16 th. reflectors and lenses reduce fall-off; diffusion increases it. tip: to minimize fall-off within a scene, use hard lights as far away as practical.
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