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Size and distance of a source
| Light Glossary |
The larger the light, the softer its quality. however, the effective size of a source also depends upon subject size and distance. a large, distant source is, in effect, small and hard (behold the sun). a 4-square-foot soft light covering a car is small, but if lighting a watch, it`s enormous.
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Speed (lens), английский
The largest stop (smallest number!) a lens can provide. tip: high-speed lenses are great for low-level illumination but limited in terms of depth of field when wide open.
Reciprocity law failure (mostly stills), английский
The lack of reciprocity at both extremes (very long and very short exposures). solution: increased exposure and, if necessary, additional compensation for the reciprocity failure of the first compensation. video/film folk normally need not fret.
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