This one that I have is for my SB800. Was just wondering if the SB900 would be better for close ups and the 800 for micro. Seems like the 900 would push the light out farther. For flowers in groupings. And for $40, that is cheap lighting. With my 28-300 I can keep farther back and get some good framing, but right now the lighting outside sucks here. Either to bright or none. What distance do you think you can shoot and get good light from it?
I now understand your question. I have no idea how much more powerful an SB-900 (with O-Flash) would be over an SB-800 (with O-Flash).
I have set my SB-600 to 85-degrees, the narrowest output. I have no idea if it really makes any difference.