I am OK with D80 build in flash , but I get some shade at the bottom when I used a wide angle or 2.8 lens. - SB-600, too big - SB-800, SB-900, too big and too much money ( I rather save to glass) What is the SB-400 have more than D80 build in flash ????? Is it worth buy a SB-400 while I had and build-in flash already ???? Thanks for all of your comments.