That's clear nowe. Except: what is "VF"? Visual focus? = manual focus?
Recall that i was the f/1.8 35 mm, so i was getting full aperture for focus acquisition if I had been using AF. But I was using manual focus. Is it true that in manual focus, the lens does NOT go to max aperture during focussing?
That would seem to be logical. (Not that Nikon programming is intuitively logical.)
The light was still too dim. Hence your suggestion to use the D600 for AF-assist.
Am I right that the built-in flash cannot be used for focus assist?