I love my D800, but I was always annoyed, that I could not turn on or off the ISO-AUTO setting with one hand. But after playing around with my camera settings I found the following solution:
- First create an new entry in your MY MENU and make sure it’s the first item at the top.
- Now go to CUSTOM SETTING MENU and assign a button to this new menu item:
f Controls -> f4 Assign Fn button -> Fn button press -> Access top item in MY MENU