Just out of interest have you noticed if these get triggered on pre-flash or not. I used to have one of these 25 yrs ago. heavens knows where it is now. I think they rely fairly high flash trigger voltage to get their power from. I bought a secondhand flash last year which has a 5 Volt trigger voltage which I currently use with a long PC lead. I'd often wondered if it would work with one of these optical slave triggers.
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Rob
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