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On the back of the camera, during image playback, press the button with the down arrow once or twice to page through the replay options. This should make the screen with the histogram go away.Give it a try and let me know if it doesn't work.
Is this a graph or a three by three square grid?
Hi again. Sorry for the delay. I was away from a computer.Are you sure this is a 6800 and not an 8600?
I'm sorry. I am going to opt out of this question which will allow other Nikon experts to chime in.