Your post did not reveal if another type of resistor is needed for completion though.
I said that you should do the test I mentioned first to make sure your scope programme works properly.
Then, try the simplest circuit shown in reply #21.
Connect longer lead of phototransistor to the bare copper wire and other lead to red/blue.
It may not be necessary to obtain any more parts.
Do you have an external power supply for your camera ?
It may be on for a long time while you are dumping.
