Pentax K-500 Operating Guide
262
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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 an external flash is used in combination with the
built-in flash, the flash output ratio is 2 (external flash) : 1 (built-in flash).
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When using multiple external flashes or using an external flash with the
built-in flash, P-TTL is used for flash control.
K-500.book Page 262 Friday, June 14, 2013 2:29 PM