Thanks Chris.
I didn't use a star filter, just stopped down the f/ratio to f/16 which causes diffraction spikes on the lights.
I used a Canon 40D.
Photo 1: 24-105mm lens @28mm, f/4.5, 0.4s exposure @ ISO400
Photo 2: Sigma 17-70mm lens @ 17mm, f/16.0, 6s exposure @ ISO500.
Photo 3: Sigma 17-70mm lens @17mm, f/8, 3.2s exposure @ ISO500
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