Pentax K-r Operating Manual page 50

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.
' ]-he AF200FG must be Combined with the AF540FGZ or AF360FGZ,
,Do not combine with accessories that have a different number of Contacts,
such as a Hot Shoe Grip, as a malfunction may occur.
Combining with flashes from other manufacturers may cause equipment
breakdown. We recommend using the AF540FGZ, AF360FGZ or AF200FG.
1
Connect the external flash to the camera indirectly.
Refer to p.187.
2 Set the sync mode for the external flash to contrast-
control-sync mode.
3 Set the mode dial to P, Sv, Tv, Av or M.
Confirm that both the external flash and built-in flash are
fully charged and then take a picture.
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: when using two or more external flashes and the contrast-€0ntrol-syncm0de
is set on the external master flash unit, the flash output ratio is 2 (master
unit) :1 (slave units). When an external flash is used in combination with the
built-in flash, the flash output ratio is 2 (external flash) ; 1 (built-in flash).
When using multiple external flashes or using an externa! flash with the built-
in flash, P-T]-L is used for flash control.