Flash Compensation
Flash compensation is used to deliberately alter flash output, for example in order
                                       to change the brightness of the subject relative to the background. Via the [] item in the photo shooting menu, flash output can be increased to make the main
                                       subject appear brighter, reduced to prevent glare, or otherwise fine-tuned to produce
                                       the desired result.
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Choose from values of from −3 to +1.
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By default, changes are made in increments of 1/3 EV. The size of the increments can be changed using Custom Setting b1 [] to 1/2 EV.
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Higher values make the subject brighter, lower values darker.
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At values other than ±0.0, a Y icon will appear in the shooting display.
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Normal flash output can be restored by setting flash compensation to ±0.0. Flash compensation is not reset when the camera is turned off.
 
