Nikon D500 camera light trigger

Job ID: 30910877

Budget: $8 – $15 USD

I am looking for a basic circuit that will trigger the shutter release on a Nikon D500 camera (using the camera's 10pin connector - using pins 6 & 4) when a laser light is pointed at a photodiode or similar electronic device in the circuit.

The circuit needs to be very compact and run off a CR2450 battery as it will be fitted inside an underwater camera housing. I don't need the circuit built just the schematic that I can build.