Flash Exposure Compensation is much like autoexposure compensation in that you can set compensation for flash exposure up to +/-2 stops in 1/3-stop increments. A positive compensation setting increases the flash output and vice versa. Flash Exposure Compensation helps reduce shadows in the background, balance unevenly lit scenes, and is a highly effective tool for producing natural-looking images.
Generally, you can set compensation on either the camera or the Speedlite or both. If you set it on both, the Speedlite's setting overrides the camera's setting.
Flash Exposure Compensation can be combined with Autoexposure Bracketing (AEB). If you're shooting a scene where one part of the scene is brightly lit and another part is much darker — for example, an interior room with a view to the outdoors — setting AEB to -1 and setting the Flash Exposure Compensation to -1 makes the transition between the two differently lit areas more natural. This technique is illustrated later in this chapter.
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