Hello All, I have been battling this cold and flu stuff and loosing.
Here is a pretty cool article on how to build a high-end flash sync. Most non-powered flash syncs only work up to around 100 feet and are only sensitive to infrared light. The designer of this unit is a cave explorer and has put together a pretty impressive design.
The photo diode used in this unit is sensitive to both visible light and infrared. As a result this unit can be used underwater.
The site owner still sells PCB boards and kits, and offers a commercial version called the firefly.
Nice documented site.
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