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Hm. Maybe it was 365nm that I was thinking, at least I got the 3 and 5 right haha
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As long as we're calculating factors, we should include:
Film: There are (were?) films available that included visible spectrum as well as invisible. Infrared film was pioneered by Kodak for science applications, but we photographic artists made beauty with it. Let's assume a standard 100 ISO color film. We have to know the wavelength response of the film used.
Digital: We all know that digital camera sensors can be customized to capture just about whatever the hell we want them to. So, for this example, let's assume a standard consumer-level DSLR camera sensor. We also have to know the WR of the sensor used.
But, that's all rather esoteric...
Having a 589nm/593.5nm is described as "holding the sun in your hands" or something like that.
I can see 365nm (the mercury spectral line) just fine.