i'm planning to make spherical panos with
NN3 and a Nikon D90 (18-105mm)
Is this a possible configuration or do i need NN5?
If doing full 360x180 spherical panos, this lens may only allow for partial tilt up. To shoot the zenith (up shot) with this lens you will either need to move the camera/lens forward on the upper rail to allow for full rotation or simply shoot manually (as most do). You could also shoot two rows - one row to catch the zenith (top) and one row to catch the nadir (floor). For many this is not a big deal but thought I would share this.
NN5 does not have this limitation and they are currently on sale :-)