I set the camera up at a distance and angle that I want then pray. I let a couple drops fall into the well to see where they land then using a pencil or similar I focus on that location. The room is darken, the flashes are set, as well as the camera. Manual focus, ISO around 400 (depending on the flash and what I'm doing) however I've gone as high as 1000. The f/stop can range anywhere from f/8 to f/32; depending on the voices in my head. The shutter is bulb and a wired shutter release. The water is dropped from a setup made by Stopshot Studio and controlled by my laptop. The act of capture is 2-handed 1 on the shutter release the other on the water drop button with the shutter released first. The water drop is released passing an infrared device that triggers the flash. One the flash is triggered I release the shutter. All this takes about 1-second however I might daydream and have the shutter open for 2-seconds. The shutter might be open for 1-second however we're looking at speeds of milliseconds.
I'll normally shoot for an hour capturing in excess of 300 files. Now that we have C1 post is so much easier. We'll review the files at 100% for focus then cherry pick the ones we like and want to process deleting the rest. I've begun posting an occasional "reject" on our Instagram/FB accounts. Our rejects that we now have would have made us jump for joy when we first began now we see them and say yeah we've got hundreds of those lets looks for something unusual.
Most people doing this are capturing using a 35mm camera. Not me, I like doing things the hard way. The GFX is perfect for this as is the GF120 and the extension tubes. I've found manual focus to not be a real issue and routinely use the camera set up on a focusing rail; I'll start the focus in camera then fine tune with the rail.
I've written and shared more on our blog if anyone wants to see more. We've also added a new section in our web gallery showing the images.
Thank you for all the positive feedback. I'll share more as time permits.
Don