[https://www.youtube.com/watch?v=a0H0vOWUjbY](https://www.youtube.com/watch?v=a0H0vOWUjbY)
Was recently watching the new Allen Pan video on making a laser grid lawn mower, and I was just confused by why we can see the lasers on the video, when it seems him and his friends couldn’t. At 6:45 it seems clear that Backyard Scientist uses his camera to see the lasers themselves because they wouldn’t be visible unless they shined the light into their eyes, but the camera can pick up the path of the lasers?
In: Physics
I don’t know anything about Allen Pan’s video production, but I’m quite sure he’s using a cinematography tool called a Hazer that…. adds haze to an environment to make things like light beams (and lasers) more visible. You can actually see the haze in his garage in the shot at 1:33 before he turns the laser on.
Conversely, here’s a short clip I recorded this past weekend of my CO2 laser using my phone camera. As you can tell, you can’t see the laser at all. You can barely see it interacting with the material.
[https://imgur.com/a/02iIznK](https://imgur.com/a/02iIznK)
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