Hi, recently I have shot about and hour of video with my 1 month old D7100 and after I got back to shooting pictures I found out that autofocus doesn't work anymore. I went through the settings, tested on three lenses (with and without internal motor) - same thing.
When I half-press shutter button, focus does not engage (illuminator does not engage too despite being set to "on"), I have a blinking "> <" in the viewfinder and if I wait a couple of seconds, lens goes to infinity and back, still no confirmed focus.
Am I missing anything, maybe I forgot some setting, or do I have a broken camera? I hope they will honor US warranty in Canada - Nikon website says they should if I have a US receipt, which I do.
I even tried to reflash recent firmware and that didn't help. I don't thing there is a full factory settings reset, is there?
I take it you're trying to focus on something nice and contrasty, and within the focussing range of your lenses? Also check that the lenses are firmly seated (see if they'll rotate that extra hair's breadth).
Live view AF works fine with all lenses. Normal AF doesn't work with 3 lenses, one of which doesn't have a motor (50mm 1.4). I have tried all AF modes including point AF and different subjects and lighting conditions.