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Activating the back button AF-ON control also activates the meter, you don't need to do a shutter half press to activate the meter in a Nikon DSLR. Actually any of a number of control buttons will activate the meter in addition to the shutter release half press. If you're talking about activating a specific metering mode like changing to spot metering when the camera is set to matrix metering then you can assign a front button like the FN or PV button so that spot metering is active while that front button is pressed regardless of how you activate the AF.
