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They are pretty basic, I have designed a few over the years.
The last one I made was yonks ago, so there are probably better ways to do it now, but I used to use a darlington phototransistor to turn the lightning flash into an electrical pulse, amplify it with an LM324 quad op-amp and filtering it to only respond to fast changes in light, and to only trigger on large pulses. Then just some basic components to trigger the electronic shutter release on your camera.
Probably about $10 in parts.
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