Pentax K100D User Manual - Page 168

166 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. • 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. 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. 5 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. • 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 ContrastControl-Sync mode. Function Reference