The first photo posted by sleekr was prolly done without a filter. It was shot with a 5 second exposure at f/5. The f/5 aperture is small enough to give this effect on point light sources.
you ned a tripod for this, since the exposure times are usually quite long. A lens with a slightly non-circular aperture works best, and the number of points will be determined by the number of aperture blades.
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