This was very difficult to take with the mixed lanes. In the Canon 70D I can select multiple exposures and adjust the layering intensity in camera. Biggest problem is to get it dark enough to have 4 exposures of about 25 seconds each. Using good ND filters is a must with this type of shots. Also, after 4 exposures the first one risks to simply vanish. Good thing is that the light streaks were very bright in contrast with the background.
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