I have noticed in the past year that when my D300 is on manual shooting mode but autofocus, it won't work and won't try to focus on something-even when there is an obvious subject to focus on-it's almost like the camera is turned off. Sometimes it has happened when the camera is level to the ground, but it happens with various lenses, etc. What is going on? Is this some sort of defect, or is it just getting worn out?
Welcome to Nikonians! Sorry to hear of your problem.
First, are you using a single AF point on a good AF target with enough contrast to lock focus?
Check Custom Setting a5: AF Activation - make sure that you didn't inadvertantly set it to AF-ON only (the AF will only work when the AF-ON button is pressed.
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Thanks in advance. Good Luck and Enjoy your Nikons!
Thanks Marty, but there was no way I could have changed the AE focus between taking photos. It's a matter of a click of the button. I actually had someone in my photo class this past weekend with this same issue- different camera and no filter......I don't understand why this would happen? Could it be altitude? Outside temperature? But I feel like it has happened in the summer and fall when it was cold. I can't believe we are the only two people with this problem.....
I have experienced this occasionally. The most recent instance was with a D600 which had sat unused for 6 weeks while I was learning another camera. Reseating the lens immediately brought relief, though only for a while. A couple of lens changes and continued use seems to have resolved the problem. Quite clearly, the contacts needed cleaning. That said, my D300 sits for weeks at a time and doesn't seem to be prone to the problem but that may be due to the particular lens mounted on it as much as the body itself.