Creating long exposure light streaks for 24 FPS video without using stop motion

Finnegan

Well-known member
Hey everyone, I'm looking for advice on how to create a particular type of lighting effect for a music video that I'm shooting in a month or so. The best way to describe it is that I want to create the type of light streaks that you'd see in long exposure photography, but in 24 FPS video form so all other motion looks natural, smooth, and cinematic.

The closest example of the effect I can find is Freddie Wong's Light Warfare video from 2010. The light streaks look good, they're clean and they move and they're enough to add some ambient light to the scene and the subjects, but it's clearly done via long exposure photography and stop motion, and so the final effect looks super framey.

Here's another visual example of what I'm aiming to achieve on video:

https://www.instagram.com/p/BNp9iflhnE6/

As you can see, the light streak is super clear, bright, and adds a significant amount of light to the scene and the subject. This was done practically, using a long exposure and a practical light source that the photographer moved by hand in the frame. Is there any possible way to get a similar effect in camera for video? I'm also open to solutions involving a mix of practical and visual effects -- I've spoken with a VFX artist about potentially laying a base in camera which he could later clean up and paint over in After Effects to really make the light streaks shine, but all this is uncharted territory for me. Anyone have any insight on how I might begin to approach creating this effect?
 
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It's possible, but it depends upon the shot and what specifically you are trying to achieve with the light streaks. You just need a point source of light moving fast during the frame. An example would be to have a dark shot and a point source of light on a stick. If the stick were to be whipped in an arc during the frame, it would provide a short streak. Use the longest shutter you can. But it is so much easier and controllable in After Effects.
 
Google Light Painting Apple Ad, theres a tutorial somewhere. There's also a car ad that uses the technique to good effect. If I remember which car I'll dig out the vid!
 
Thanks for the advice everyone, I'll explore all these options. And if anything else jumps out at you, feel free to continue sharing. And I'll update with my results.
 
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