Pentax K-5 II User Manual (en)

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When combining two or more external flashes
Combining two or more external flashes (AF540FGZ, AF360FGZ or 
AF200FG) or using an external flash in combination with the built-in flash 
allows multiple flash photography (contrast-control-sync flash 
photography). This is based on the difference between the amounts of 
light discharged from multiple units.
1
Connect the external flash to the camera indirectly.
2
Set the sync mode for the external flash to contrast-
control-sync mode.
3
Confirm that both the external flash and built-in flash are 
fully charged and then take a picture.
When using multiple external flashes or using an external flash with the built-in 
flash, P-TTL is used for flash control.
Contrast-Control-Sync Flash
The AF200FG must be combined with the AF540FGZ or AF360FGZ.
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