Nikon D5 User Manual page 194

D
Direct Measurement Mode
If no operations are performed during viewfinder photography while
the displays are flashing, direct measurement mode will end in the time
selected for Custom Setting c2 (Standby timer, 0 301).
A
Protected Presets
If the current preset is protected (0 178), 3 will flash in the top
control panel and viewfinder (and L in the rear control panel) if you
attempt to measure a new value.
A
Selecting a Preset
Selecting Preset manual for the White balance
option in the photo shooting menu displays the
dialog shown at right; highlight a preset and
press J. If no value currently exists for the
selected preset, white balance will be set to
5200 K, the same as Direct sunlight.
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