The following list is what you need to take water crown shot.
Camera: Prefer the latest model of DSLR. However, any camera with burst mode should work. Digital camera is the best because you can see the results immediately. Point & Shoot cameras are fine but they normally do not have high shoot speed so it will be harder to capture the water droplet.
Lighting: It's great if you have external lighting source such as flash or other lightings projects directly to the water surface.
Lens (Assuming using SLR/DSLR): If you are using flash, I prefer using a zoom lens (I used Canon EF 70-200mm f/2.8 IS USM L + 2x extender). If you have external lighting projects directly on the water surface, you can use close up/macro lens (macro ring flash is the best of course).
Materials: Any liquid will work. Milk is a great choice. If you are using water, I suggest to add a couple drops of food dye (red and blue work the best). Of course, you need a bowl to hold the liquid.
Other: You must have a tripod and a shutter release. Camera remote will work only if the remote all you to do burst shoot.
When you have all the materials ready, here is how I shot.
- Mount the lens, flash, DSLR, and tripod together.
- Change DSLR to shutter priority. You can try 1/500 or 1/1000 for shutter speed. Change ISO to match the lighting condition (ISO 100 or 200). Increase EV if necessary.
- Pour some water into a bowl and put into a sink.
- Add a couple drop of food dye.
- Change the DSLR to manual focus. Focus the water surface as much as possible. Don't worry if you don't get it right at this time.
- Drop some water droplets to the bowl of water. Figure out the water dropping point on the water surface. Focus that point as much as possible.
- Take a couple shots while the water is dropping into the bowl.
- Preview the shots (I prefer to load the photos into a computer and view it there).
- If the dropping point is out of focus, adjust the focus ring based on the current focus in the current picture.
- Repeat the focus procedure until you get the right focus.
- Now, you can use boost shot to as many photo as possible. You should be able to pick a couple good one from them.