Simple.. Run the water. till min. Get in focus with the water (this is the hard part) cuz I am not using auto. I use manual. Shuttle abt 500 or more...Aperture I set abt 4. Take shots to see if you focus the water already. Somtimes on the LCD it might seems to be focus but when on bigger screen it's not. So try and try and try..I am sure u'll get it right. Good luck! now I wanna try different patterns of water falling... Sure need alot of patience!