It looks like I have some AF problems because, without the illuminator, AF in low light is difficult.
I'll have to call CPS or contact Nikon Support.
>>Typically I use Manual mode for portraits, but it also >>happens in Aperture priority. >> >I was actually wondering about what autofocus mode, not >exposure mode. > >At any rate, my D600 seems impervious to low light issues so >far and I leave the illuminator on, as I have on all my >bodies, (including my venerable D200). It seems to have to be >very dim before it comes on, btw.