Editor’s note: This walkthrough was originally published on Clint Decker’s Flickr account. We found it pretty informative and asked him to share it here.
Here is a little video on how I did the photography with Canon Speedlites while dropping items into a tank of water.
With a white background, I used a Canon Speedlite 580ex II on the left and right of the fish tank with water. They were set to manual 1/128sec.
I had a Canon Speedlite 430ex II on a chair behind the fish tank pointing towards the white background so it would come out pure white. This was set to manual 1/64th of a second (I would of done 1/128 but the 430ex II can only go down to 1/64). You want to go 1/128 so it freezes the splash mid air.