monolight watt sec. question

Started Dec 19, 2012 | Discussions thread
Barrie Davis
Barrie Davis Forum Pro • Posts: 21,460
Re: depends...10 perhaps

Klaus dk wrote:

Quantum Help wrote:

Ws is a measurement of power delivered from a capacitor to a flash tube. For a better reference of light output, BCPS (Basic Candle Power Seconds) is the amount of light produce by the flash tube. Wonder what the photographers in the 1800's used as a measure of light output for their black powder flash guns?

I think it was magnesium powder mixed with some oxidation medium, not black powder.

Yes. It was silver grey colour, and came in a cardboard tube with an orange label. It weighed about 600 grams, if I recall correctly [??] I think May and Baker were still making it, and this would be back in the early 1960s. My local chemists shop had it in their glass case with other photo-chemicals...bottles of Johnson's developers, etc.

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"Ahh... But the thing is, these guys were no ORDINARY time travellers!"

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