[albrewer]

> This made them useful for astronomers because their light was easily filtered

The wavelength is so specific that it can have all kinds of cool applications:

https://youtu.be/UQuIVsNzqDk?si=R4VUDCfC6zcHd4XC

[danudey]

I knew what this link was before I clicked it, and it's a must-watch for anyone who's interested in basically any aspect of film making, cinematography, or light science in general. Extremely cool topic.

[junon]

I already know this is the Mary Poppins Corridor Crew video before clicking. Super cool video.