I've seen it before: a crisp image of a water droplet in mid-air, free falling. As cliche as the concept is, and as many times as I've seen similar images, I can't help but admire the technique involved at actually accomplishing the shot. To freeze an instant in time and allow a glimpse at something too quick even for the human eye to register is remarkable. So here is my take done by the bathroom sink, only with a twist (probably also done before, but hey cut me some slack, i'm learning here!).
After several attempts, I finally perfected the shot that accomplished 2 major objectives: freeze the water droplet, but capture multiple drops simultaneously, or even the same droplet during its descent. In essence, it is a multiple exposure capture. If you're unfamiliar with this process, this is how it works. By providing multiple bursts of light while an object is in motion, the camera can record specific instances of that moving object on its final image. The trick is in delivering small amounts of light quickly while the shutter remains open long enough to capture them.
In brief, this shot was taken at 1/15' f4 ISO 50. The slow shutter speed is required to allow time for the passage of the water droplet. As it descends, flash on stroboscopic mode will deliver a rapid fire of flashes. As far as the number of flashes and rate at which it's delivered, that's more of a trial and error process than actual pre-calculation. I can't recall the exact figure, but I believe I ended up using about 10 flashes at about 40Hz, which implies I should have had about a 1/4' shutter speed to capture the total number of flashes, but 1/15' was close enough, and was as slow as I could hand-hold.