Wail,
You need something that stores water and allows it to drip out (in my case a burette).
You then set this up so that the drips fall through the hole in the water drop detector breaking the light beam within.
You then turn the sensitivity control until each water drop lights the LED.
The water drop detector is then connected to the universal trigger interface and the interface connected to the camera.
You then run one of several supplied routines:
INSTANT
TRIGGER
INTERVALOMETER
SOLENOID
in this case TRIGGER...
You then set:
the number of repeats (just a large number will do)
the camera port ON
the camera delay to say 100 milliseconds
the flash port OFF (the flash is firing from the camera in this example)
the repeat delay
Then the camera is in MANUAL mode setup as you would for a studio and MANUALLY focussed on the point where the water drop will hit.
Then you start the drips......
As each drip goes through the device it waits for (camera delay/1000ths second) before it fires which will give the drip time to fall into the water bath underneath.
You can see this in the rear screen of the camera.
By adjusting the CAMERA DELAY setting up and down you whilst it is working you can set it so that it takes the picture at just the right time for the effect you want