I was trying to switch from FX to DX mode using my newly acquired d600. Can't seem to find a quick "one touch " way. I can assign my menu to the function button, put the image area as top selection but that's not exactly one touch😢
Can I assign the function button so it switches back and forth between modes?
Custom Functions, f2 or f3, select 'Choose Image Area'. It's not one touch, you'll have to rotate the rear command dial while you hold the button you chose, but it's very quick and easy to use.
I don't have one in front of me at the moment but but try add it to the top of "my menu", and then you can assign one of the function buttons to "access the first item in my menu".
Page 242 of the user manual. Assign 'Choose Image Area' to either the Fn or Preview buttons. Press said button and rotate a command dial to choose FX or DX.