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With respect to Photography, this is zooming during an exposure. The intention is to impart a sort of "exploding image" effect. Timing is everything in order to avoid having too much exposure time at either the long or short focal length end of the exposure, and the result may depend on which end you start at. It should be obvious by now that a sturdy tripod and exposure time of at least 2 seconds is going to be required to attain the intended effect. A big, rapid change of zoom in a short time will likely introduce camera shake with the zoom lines appearing wavy instead of straight. Success in the technique is often determined by trial, and a few attempts would be recommended to raise the possibility of getting a good shot.

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Q: What is dynamic zoom?
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