I currently have a D700 & thinking of upgrading to the D4s, as of right now I am using a I mac with snow leopard & light room 4. I know this is out dated but it works very well for me & I don't want to change, If I went to light room 5 I would have to upgrade my Imac. So my question is how would you process the d4s NEF files in light 4 ?