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Contrast-Control-Sync Flash

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.

5 FunctionReference

• 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.

1Connect the external flash to the camera indirectly. (p.164)

2Set the sync mode for the external flash to the Contrast-Control-Sync mode.

3Turn the mode dial and set the exposure mode to e, b, cor a.

4Confirm that both the external flash and built-in flash are fully charged and then take the picture.

• 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.