The Slow Mo Guys saw the Crazy Russian Hacker burn steel wool for homemade fireworks and thought it deserved the slow-motion treatment.
It did turn out quite pretty. Notice that they watered the lawn before trying the stunt, and both Dan and Gav wore safety goggles. Those sparks don’t burn long, but it doesn’t take long for one to injure an eye! -via Tastefully offensive
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There have been some huge advances in high speed camera technology, and it isn't just the ability to read images fast enough to take continuous footage at high speed. Some of the current high speed cameras I've seen around will have a peak quantum efficiency of ~60%, and a fill factor of ~50%, so they will convert about 30% of photons to electricity, while having noise figures on the order of tens of photons (although there are some was of fudging those figures). CMOS based cameras have taken over a lot of areas that were only available to ICCD cameras, which are much less common and often limited to 1-2 frames at a time (but still a little more sensitive and faster gating for those frames). Plus burning metal can be pretty bright...
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I am amazed that the camera can pick up so well with so little light. Slow motion often needs a lot of light in order to acquire an image.
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