Nikon Z 7 Reference Manual page 375

• 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.
D
Unified Flash Control
Unified flash control allows the camera and flash unit to share settings.
If a flash unit that supports unified flash control is mounted on the
camera, changes to flash settings made with either the camera or flash
unit are reflected on both devices, as are changes made using optional
Camera Control Pro 2 software.
D
i-TTL Flash Control
When a CLS-compatible flash unit is set to TTL, the camera
automatically selects one of the following types of flash control:
• i-TTL balanced fill-flash: The flash unit emits a series of nearly invisible
preflashes (monitor preflashes) immediately before the main flash.
The camera analyzes preflashes reflected from objects in all areas of
the frame and adjusts flash output for a natural balance between the
main subject and ambient background lighting.
• Standard i-TTL fill-flash: Flash output is adjusted to bring lighting in the
frame to standard level; the brightness of the background is not
taken into account. Recommended for shots in which the main
subject is emphasized at the expense of background details, or when
exposure compensation is used. Standard i-TTL fill-flash is activated
automatically when spot metering is selected.
On-Camera Flash Photography
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