>Both the SB400 and the SB600 work fine with my D5100. You >don't need another flash. Either a setting is set wrong or >your D5100 has a problem. Check into it. > >I have no problem at all using the D5100. I find changing >settings pretty easy. While I change ISO frequently the other >settings not so much. Pressing the"i" button and >scrolling down is pretty quick. Just spend a little more time >with it and it pretty much becomes second nature. > > > >Len > > I agree with this---these controls are the same as the ones on my D3100 and I can change the ISO or other settings really quickly since I've practiced.
Your flashes should work fine, too.
working on it in Middle TN Nikon D3100
35 mm 1.8 Nikkor 18-55 mm Nikkor VR 55-200 mm Nikkor VR 55-300 mm Nikkor VR 150-500 mm Sigma OS Feisol CT3471 & Markins M20 ballhead