which camera D3 or D300 with 10.5 lens? I have both and a nn5l but what do you think is best. is it worth cutting the hood off the 10.5.
The D3 will only work on the NN5L.
The D300 will work on both the NN5L and NN3 MKII.
I believe you will find little difference in output quality between the two cameras with respect to doing panoramas. The full frame feature of the D3 may mean a couple less shots in your work flow. Personally I wouldn't go through the efforts of shaving the hood on the 10.5 just to take a couple less shots - you could damage the lens, get shavings inside and certainly void any warranty.
These are personal choices - I have heard others doing it like users of the Canon 5D.
Maybe consider getting the Sigma 4.5mm lens f/2.8 lens.