This site held my interest mainly because it does deal with the still camera and I am learning photograpgy but it explains in debth how the zoom lens works and the different veiws one could achive by using one of the many varieties of zoom lenses. I allows one to go from a normal viw to then get closer and closer without much focusing needed. Which while filming i can see ho this is a much needed tool and would sorten the filming duration.
http://en.wikipedia.org/wiki/Zoom_lens
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