The 10.5mm is a fun little lens, although to be honest I rarely use it. If you have proper software to correct it (ptlens or dxo work best) then you'll love it, but keep in mind that this adds an extra step to your workflow. Buy it and keep it in your bag for when the 14-24 isn't wide enough. I see you're using the D300 so I'm not sure why you're buying the 14-24f/2.8 instead of a wider lens like the 12-24mm or the even better Tokina 11-16mm. Remember the crop factor......