We are making pictures. We are making magic. If you want to make some high speed sink portraits or even action shots, here are three tips that may help you. High speed sink allows me to use flash at shutter speeds faster than one to 50th of a second. One five hundredth of a second. One one thousandth of a second which is great for stopping action. First I'm going to make an exposure of the scene that's perfect and then under expose it by about one or one and a half stops. By under exposing the background this way, when I add my flash it will illuminate the subject. Next I'm going to form a triangle between the camera, my subject and the flash off camera. The use of off camera light is going to reveal all the texture or contours of my subject. Now you need to determine do I want to use TTL or manual? If my subject is moving towards me or away from me, TTL is a good choice. If the subject is stationary and a portrait, I probably would use a manual flash output power. If the subject is moving towards me, I would use a manual flash output power. If the subject is moving towards me, I would use a manual flash output power. If the subject is moving towards me, I would use a manual flash output power. If the subject is moving towards me, I would use a manual flash output power. If the subject is moving towards me, I would use a manual flash output power.