In order to consistently photograph something like milk drops the usual method uses a high-end camera , Speedlite flash and an optical electronic delayed flash trigger. There are lots of DIY circuits for this purpose, but they still require a high-end flash unit. And you have to manually open the shutter requiring the photo to be taken in a darkened room. Here's how you can consistently take the same photos with an inexpensive point and shoot camera, no external flash, all without fumbling ...