What is the exact mechanism that triggers a optical slave flash?

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eyun89 New Member • Posts: 1
What is the exact mechanism that triggers a optical slave flash?

I'm trying to figure out how to trigger an AD200 flash with a light source that does not come from a camera built-in flash. But I have no idea where to look to find a solution. I've learned that S1 triggers with any light and S2 triggers after a pre-flash. Is there a "brightness threshold" I have to overcome?

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FinePix S1 Nikon 1 S2
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