If Checked then the exposure locks when AE-L/AF-L button is pressed. If not checked then Auto Exposure is locked when the shutter release is press 1/2 way. The default setting is unchecked.
Supported only by D200, D3, D3S, D3X, D300, D300S, D40, D40X, D5000, D60, D7000, D80, and D90.
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