B: Metering/Exposure; B1: Iso Sensitivity Step Value; B2: Ev Steps For Exposure Cntrl - Nikon D7100 User Manual

b: Metering/Exposure

b1: ISO Sensitivity Step Value

Select the increments used when making adjustments to ISO
sensitivity. If possible, the current ISO sensitivity setting is
maintained when the step value is changed. If the current
setting is not available at the new step value, ISO sensitivity will
be rounded to the nearest available setting.

b2: EV Steps for Exposure Cntrl

Select the increments used when making adjustments to
shutter speed, aperture, exposure and flash compensation, and
bracketing.
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G button A Custom Settings menu
G button A Custom Settings menu