Weird !!!
with the above combo, the infra red focus assist light on the SB800 doesn't lit when the lens is on 12 mm to somewhere between 15-18 mm
Give me a panic attack because of it
I've asked my friend to test with his set, same thing !!!
a Nikon's glitch ?

Already emailed Nikon for answer.
With D80, it's working fine, all the way of the lens' range
I wonder how is it on D3 and D200 ?
Anybody could give it a try ?