You haven't filled in your location information, so I'm going to have to guess about things you can get easily.
A quick google found this:
https://www.amazon.com/Ramsey-LTS1-Laser-Trip-Sensor/dp/B0002QG2YA
I don't know if it's fast enough. There may be others out there, or you could possibly hang something faster than a relay like maybe a simple FET circuit off the relay inputs to trigger the camera. My camera doesn't support this or I'd probably try it.
A more expensive but presumably more professional idea:
https://www.woodselec.com/
Or are you just looking for a finished schematic you can build?
Good luck, sounds neat. Will you post a cool picture if you get one?
Torben