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Off-camera high speed synchronisation
In wireless SLAVE mode, the speedflash can receive high speed
synchronous signal from the MASTER flash.
Note: For correct use of high speed / rear curtain sync, please
properly set camera flash mode and shutter speed.
High speed synchronisation off the camera can be achieved in two
ways:
1. Wireless TTL trigger (the trigger must support high speed
synchronisation)
2. Set the speedflash to SLAVE mode
Canon:
To use high speed sync in SLAVE c mode, with the
speedflash receiving Canon wireless instructions, first set the camera
in manual mode, using the built-in flash as the MASTER flash, and
the maximum sync speed set to no more than 1/200 or 1/250.
Nikon:
To use high speed sync in SLAVE n mode, with the
speedflash receiving instructions from the Nikon’s built-in flash (an
external flash with MASTER control function can also be used), select
the Auto FP function from the camera menu.
Camera menu access (newest Canon cameras only)
A relatively new feature of Canon cameras is that external flashguns
can now be accessed and controlled from the camera menu. In
the flash control menu of the camera, go to ‘External flash function
settings’ and then ‘External flash custom function settings’ to set the
flash-related parameters, such as switching between E-TTL mode,
manual flash mode and multi flash mode; you can also access the
wireless flash settings, adjust the exposure, exposure compensation,
focal length, and other advanced options.