Nikon D810 - Manual (Page 349)

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Choose On to display on-demand grid lines in the viewfinder for
reference when composing photographs (0 6).
If Show ISO sensitivity or Show ISO/Easy ISO is selected, the
control panel will show ISO sensitivity in place of the number of
exposures remaining. If Show ISO/Easy ISO is selected, ISO
sensitivity can be set in exposure modes e and f by rotating the
sub-command dial or in mode g by rotating the main command
dial. Select Show frame count to display the number of
exposures remaining in the viewfinder and control panel.
Choose On to display tool tips for highlighted item in the
b-button display during viewfinder photography (0 205).
d7: Viewfinder Grid Display
G
button ➜ A Custom Settings menu
d8: ISO Display and Adjustment
G
button ➜ A Custom Settings menu
d9: Screen Tips
G
button ➜ A Custom Settings menu