Pentax K-7 Operating Manual page 63

Wireless Flash Control (P-TTL Flash Mode)
When using external flash units (AF540FGZ or AF360FGZ) for
wireless shooting, the following information is exchanged between
the flash units before the flash is discharged.
Press the shutter release button fully.
4,
1 The flash directly connected to the camera emits a control flash
(relays the flash mode of the camera).
2 The wireless remote flash emits a control flash (relays
confirmation of subject).
3 The flash directly connected to the camera emits a control flash
(relays flash output to the wireless remote flash).
* The flash directly connectedto the camera will emit a control flash one
more time after this to relay the flash duration time when HS _ (High-
speed flash sync) is set.
4 The wireless remote flash discharges at the same time as the
main flash.
when the Wireless mode of the external flash directlY connected to the
camera is set to [MASTER] or [31, Flash in Wireless Mode] (p,17Z)is set
to [On] for the built,in flash, al! the flashes wil! discharge simultaneously.
As with the built-in flash, red-eye reduction is available with an external
flash. However, depending on the type of the flash, this function may not
be available or may have some restrictions for usage conditions. See the
chart on p.173.
; The red-eye reduction function W0rks by discharging the flash twice even
when only a n external flash is used. (p.75)
, If red,eye reduction of the bui!t-in flash is used when the externa! flash is set
as the s!ave unit or with the wireless function, the preflash for red-eye
reduction wi!l trigger the external flash. Do not use red-eye reduction when
using a slave unit.
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