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IR cameras are neat.

Did you know the lenses for thermal cameras are made of solid germanium? Because glass is opaque to anything beyond NIR, and thermal cameras work at much longer wavelengths (and germanium is transparent to those wavelengths, but with a high index of refraction)
-F

@Felthry

I did not know that! I was, as the kids say, today years old when I learned that.

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