a strobist experiment, sorry for the pic forced but my camera is not good in hi iso 

Strb info: SB-600 at left model in m 1/16, 14mm
SB-600 at right model m 1/32, 35mm
SB-600 in column (No1) bounced to roof
SB-800 behind the camera with diffused umbrella m 1/16 14mm
Exif:
Nikon D90
exp: 1/20
len: 27mm (18-70mm)
iso: 1250
bedankt


Strb info: SB-600 at left model in m 1/16, 14mm
SB-600 at right model m 1/32, 35mm
SB-600 in column (No1) bounced to roof
SB-800 behind the camera with diffused umbrella m 1/16 14mm
Exif:
Nikon D90
exp: 1/20
len: 27mm (18-70mm)
iso: 1250
bedankt