Pentax K-5 Operating Manual page 15

Using Flash in Wireless Mode
By using two external flashes (AF540FGZ or AF360FGZ) or using the
built-in flash with one or more external flashes, you can shoot in P-TTL
flash mode without connecting the flash units with a cord.
,Set the power switch of the externa! flash t° WIRELESS.
, Two or more AF540EGZ/AE360FGZ externa! f!ashes are required t0use
high-speed flash sync in wireles s mode. This function cann0t be used in
Combination w th the builtdn flash:
, Set the wireless mode of the external flash not directly connected to the
camera to SLAVE.
First, set the channel for the external flash unit.
1 Set the channel for the external flash unit.
@
L Remove the cover of the hot shoe and attach the external
flash.
3
Turn on the camera and the external flash, and press the
shutter release button halfway.
The built-in flash is set to the same channel as the external flash unit.
, When set to w_. mode i the channel current!y set for the built-in flash is
displayed in the viewfinder fo r 10 sec0ndsl
• Be sure to set all the flashes to the same channel. Refer to the manual of the
AF540FGZ or AF360FGZ for details on how to set the channel on the
external flashi