uugh! I hate it when I do this to myself ... I was playing around with a lighting setup today and I had a friend who was posing for me (I let her borrow my lights to photograph her son so she posed for me). I get everything set up, metered my AB800 at 1/4 power and set my SB-800 as my fill at 1/16 power (1:4 ratio right) and shot away ... stuff looked OK on the camera so I continued to shoot ... got home, loaded the images and there seems to be no fill at all .... then I realize what I did wrong ... YES, 1/16 is 1:4 ratio if the OUT PUT of the sources IS THE SAME ... there is a HUGE difference between the out put of my AB800 at 1/4 power and my SB-800 at 1/16 power ... no wonder they are dark! WHY don't I think of these things BEFORE the end of the shoot? Well, at least these weren't important .... ... lesson learned!