Focus Pull Fireworks
This is a really cool effect achieved by a long exposure, and focusing and refocusing on the fireworks. Photos below are from photographer David Jones's "How I Took It" 2012 contest entry. "How I Took It" is one of DIY Photography's tutorial contests to share with their subscribers. The photos below push the boundaries of bokeh and frozen motion in a long-exposure. See the tutorial on DIY Photography and photographer Davey Johnson's website