Pentax K 100D Super User Manual Page 168

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5
Function Reference
Combining two or more external flashes (AF540FGZ or AF360FGZ) 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. (p.164)
2 Set the sync mode for the external flash to the Contrast-Control-Sync
mode.
3 Turn the mode dial and set the exposure mode to e, b, c or a.
4 Confirm that both the external flash and built-in flash are fully charged
and then take the picture.
Contrast-Control-Sync Flash
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 PENTAX automatic flashes.
When using two or more external flashes and the Contrast-Control-Sync
mode is set on the external master flash unit, the flash output ratio is 2
(master unit) : 1 (slave units). When 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 an external flash with the built-in
flash, P-TTL is used for flash control.
The fastest flash synchronization speed is 1/180 second in the Contrast-
Control-Sync mode.
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