Nikon SB 20 Instruction Manual page 46

System chart for TTL multiple flash operation
S8-16A
@
~
SB·21A
~~
lJJlQ&J
lJiQ}j
Nikon F-501/N2020 Nikon FA
uIQJ~
Nikon F-401 fN4004 Nikon FE2
mQiJ O
Nikon FG Nikon F-301{N2000
" -- -- -- -----1
@
indicates the "master" flash unit.
44
SB11
0
SB141
58140
@~
@
SC-17
*The S8-11, S8-14, S8-140 and S8-218 cannot be used with
Nikon F-401/N4004 either as a master or slave flash unit.