Pentax K-7 Operating Manual page 60

Using in Wireless Mode
By using two external flashes (AF540FGZ or AF360FGZ) or using the
built-in flash with an external flash, you can shoot in P-TTL flash mode
without connecting the flash units with a cord.
' Set the p0wei switch of the external flash t0 W!RELESS
' Two or more AF540EGZ/AF360FGZ external flashes are required to Use
High-speed flash sync in the wireless mode. This function cannot be used in
combination with the built-in 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 on the camera.
1 Set the channel for the external flash unit.
,2 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_ model the channe! current!y set fo[the built-in flash is
displayed in the viewfinder for 10 seconds.
• Be sure to set all the flashes to the same channel. Refer to the manual of
AF540FGZ or AF360FGZ for details on how to set the channel on the
external flashi