The technique is simple — with your camera in "bulb" mode and fixed upon a tripod, twist the focus ring of your lens steadily (in manual focus mode) while the shutter is open for a second or two. Begin the exposure with the fireworks well (but not too far) out of focus and end the exposure with the burst in-focus (or very close to that point).
It's not as easy in practice – timing is one of the main challenges. You want to time the shutter to open at the point of the explosion and close before the light fizzles. Also, this technique works better with displays that shoot more single bursts of fireworks, as opposed to those that shoot lots of them in succession. In other words, the grand finale is not the time to employ this approach. This technique definitely relies on a good deal of trial and error, and success will not be on your side all (or even most) of the time.
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