Example 2: Shooting mode is A/Av and flash on ETTL. The aperture is set to whatever f/stop you have chosen. As you spin the main dial switching f/stops, the camera automatically adjusts the shutter speed to accommodate the changes you are making. Now let’s say you want to make the background darker or lighter and still be in A/Av mode. In these three photos you can see on the exposure bar the normal exposure, the -1 EC, and the +1 EC. On the Canon you adjust this with the main dial on the back.
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