Nikon D810 - Manual (Page 357)

333
A
The SB-400 and SB-300
When an optional SB-400 or SB-300 flash unit is attached and turned
on, Custom Setting e3 changes to Optional flash, allowing the flash
control mode for the optional flash unit to be selected from TTL and
Manual.
A
“Times“
The options available for Repeating Flash > Times are determined by
flash output.
Output Options available for “Times” Output Options available for “Times”
1/4 2 1/32 2–10, 15
1/8 2–5 1/64 2–10, 15, 20, 25
1/16 2–10 1/128 2–10, 15, 20, 25, 30, 35