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Diaphragm, iris, aperture (camera lens)
| Light Glossary |
The adjustable opening of a camera lens which controls the quantity of light reaching the film. see: stop. some lights also have an iris.
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Adjustable, английский
- Регулируемый; переставной; корректируемый
- Zero, adjustable range регулируемый нуль, регулируемая дальность
- Настраиваемый; регулируемый adjustable arrayмассив переменной длины; массив с переменными границами
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Brightness ratio, contrast ratio, английский
The all-too-often awful truth about a subject or scene that has inappropriate or excessive contrast. meter reading procedure: take two reflected-light readings: 1) the lightest significant area of the subject or scene and 2) the darkest. divide 1) by 2). each medium or method of reproduction has different brightness ratio limits. movie theaters can project a maximum of about 125:1 (7 stops plus); modern, well-adjusted video cameras 30 or, some pros suggest, 40:1. also see: lighting ratio and contrast.
Intensity, light level, light output, английский
The "strength" of the incident light independent of subject reflectivity, commonly measured in foot candles or lux. high levels allow for increased depth of field (not always desirable) or faster shutter speeds (stills or high-speed filming). optimum levels are what one strives for. realistic levels are what one settles for.
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