 Diane L. Thomas |
E TTL high speed Sync Can someone explain E TTL high speed sync to me and how and when to use it. Diane
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- Gregory LaGrange Contact Gregory LaGrange Gregory LaGrange's Gallery |
It's a measuring of how much flash to use by making a quick preflash before the picture is actually taken. There's a sensor, which is basically a flash meter in the camera, that will read the light from the flash coming back off the scene through the lens and will determine from that how long to make the real flash last for the actual picture to get the correct exposure. It's meant to be more accurate than something like using a sensor on the flash head. A flash needs to pop off when the shutter is fully open. Synchronized, which is where sync speed comes from. Try a shutter speed too fast, and the shutter begins to close before the flash fires off, making part of the picture getting the flash and part not. High speed sync synchronizes the flash to use a higher than normal shutter speed. A setting that probably is only for a dedicated flash made for the camera. You would use it when you're using flash with moving objects and trying to freeze motion. High speed sync will reduce or eliminate ghosting, which is some blur from available light mixed in with the image that comes from the flash. It's a way to get a really clear and sharp image of a moving subject.
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