Nikon D850 Menu Manual page 41

• TTL: i-TTL mode. In the cases of the SB-500, SB-400, and SB-300,
flash compensation can be adjusted using the W (M) button.
• Auto external flash: In this mode, output is adjusted automatically
according to the amount of light reflected by the subject; flash
compensation is also available. Auto external flash supports
"auto aperture" (qA) and "non-TTL auto" (A) modes; non-TTL
auto is selected automatically if a non-CPU lens is attached
without specifying the focal length and maximum aperture
using the Non-CPU lens data option in the setup menu
(0 169). See the flash unit manual for details.
• Distance-priority manual: Choose the distance to the subject; flash
output will be adjusted automatically. Flash compensation is
also available.
• Manual: Choose the flash level manually.
• Repeating flash: The flash fires repeatedly while the shutter is
open, producing a multiple-exposure effect. Choose the flash
level (Output), the maximum number of times the unit fires
(Times), and the number of times the flash fires per second
(Frequency, measured in Hertz). The options available for
Times vary depending on the options selected for Output and
Frequency; see the documentation provided with the flash
unit for details.
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Menu Guide