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I haven't used the DoF button on my D300 in a while and last evening, while playing with the camera, realized that when I press the DOF button, I do not see any difference in the view finder (typically you would see some change). I had a 18-200 mm lens on it when I tried it. I for sure remember the button was working before. Not sure if I changed anything on the menu to disable the function.
Can you think of any that would result in the loss of DOF functionality? Please suggest.
Thanks & Regards,