Nikon D6, Reference Manual

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642
Using an On-Camera Flash
4
Adjust shutter speed and aperture.
5
Take pictures.
D
Shutter Speed
Shutter speed can be set as follows when an optional flash unit is used:
* Shutter speed may be set as slow as 30 s if slow sync, slow rear-curtain
sync, or slow sync with red-eye reduction is selected for flash mode.
D Third-Party Flash Units
Do not use third-party flash units (units that apply negative voltages or
voltages over 250 V to the accessory shoe). Use of third-party flash units
could not only interfere with normal operation, but damage the sync
circuitry of the camera or flash.
Mode Shutter speed
P , A Set automatically by camera (
1
/
250
s–
1
/
60
s)
*
S
1
/
250
s–30 s
M 1 /
250
s–30 s, Bulb , Time