Here is a little video on how I did the flash 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. I also used another Canon Speedlite 430ex II in front of the tank at a 45 degree angle to fill the shadows on the front of the object your dropping. This one isn't totally necessary cause you can angle the side flashes a little to help hit the front of the object, but I had the flash available and I liked the results better when using it. I only had to squeegee the tank splashes once every 10 or so drops when using white cause its really easy to remove the spots in Lightroom with the exposure brush. But on the black background, it was a totally different story. I had to squeegee every single time or the spots on the side of the tank would appear as bright as day in your photo, making it much harder to remove them in post. I bought a squeegee from WalMart for $1.50, and cut the handle off (since otherwise the handle would hit the end of the tank before I was done wiping it off). With a black background, you dont need ...
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