May 2013
Beginner
400 pages
15h
English
Content preview from Cinematography: Theory and Practice, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Technical Issues
Flicker
As discussed in the chapter on Lighting Sources, there are two basic kinds of light sources. One is a filament (usually tungsten) that is heated by electrical current until it glows and emits light. The other type is a discharge source. These include fluorescents, HMIs, Xenons, mercury vapor, sodium vapor, and others. In all of these, an arc is established between a cathode and an anode. This arc then excites gases or a plasma cloud, inducing them to glow. All discharge sources run on alternating current.
Any arc-based bulb powered by alternating current has an output that rises and falls as the waveform varies. Alternating current rises and falls as it heats a tungsten filament as well, but the filament stays hot enough ...
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