This episode is the first of the new series about Flash photography. Before even introducing a Flash in the equation, one needs to understand a fundamental aspect which is the Flash Sync-Speed… As we have seen in a very early episode about the camera’s Shutter, it is composed of 2 blades much like stage curtains. While old film cameras have their blades move horizontally, all new DSLR’s have them do vertically. As we discussed earlier, the Shutter speed is the time during which the sensor is exposed to the light, between the opening of the first curtain and the closing of the second. Let’s call those curtains: 1st curtain and 2nd curtain. Interestingly, for each camera, there is a Shutter speed beyond which the 2nd curtain (the closing one) starts moving before the 1st curtain (the opening one) has fully opened. The faster your Shutter speed is the narrower the time lapse between the opening and the closing of the 1st and 2nd curtain. Some DSLR like the Canon 60D I own enables me to reach 1/8000 sec. At that speed, the two curtains are following each other extremely closely.
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