"A better choice for focus assitance would be to use an SB series CLS compatible speed-light, so to commander mode, so its much better patterned near IR AF assist light is engaged."
I just got through an extesive dialog with very patient & helpful Gray-star on this forum, re the "mechanics" of using the SB-600 mounted on the D7000, and why I need to set the camera to AF mode S (as you did say), and how AF area mode is irrelevant in that case.
As to the quoted language:
I have an SB-600, as i said. I believe it is "CLS compatible" (accordidng to the D7000 manual, p 225):
(If the SB-600 on mounted on the D7000, the built-in flash settiungs don't matter, I am told). Accoridng to p. 225: If the SB-600 is off the camera, set the built-in flash to commander mode; the built-in flash will emit only "monitor pre-flashes".
So, I assume that you mean that the on-camera flash, not the (remote SB-600) is set to commander mode.
But the, which is the "much better patttern IR assist lighht" to which you refer? On the cmaera, or on the remote SB-600. If on the SB-600, why is this better when the SB-600 is remote than remote than when the the SB-600 is mounted on the camera?