Pentax K20D - Manual (Page 149)

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Usi
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Fl
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5
As with the built-in flash, red-eye reduction is available with an external
flash.This may not be available on some flashes or may have restrictions
for usage conditions. See the chart on p.143.
When using the built-in flash with an external flash (AF540FGZ or
AF360FGZ) that is set to the Trailing curtain sync function, the built-in flash
will also use this mode. Confirm that both flash units are fully charged before
shooting.
Red-Eye Reduction
• The red-eye reduction feature works even when only an external flash is
used. (p.64)
• If red-eye reduction of the built-in flash is used when the external flash is set as
the slave unit or with the wireless function, the preflash for red-eye reduction will
trigger the external flash. Do not use red-eye reduction when using a slave unit.
Trailing Curtain Sync
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.
1 The flash unit directly connected to the camera emits a test
flash (relays the flash mode of the camera).
2 The wireless flash unit connected to another flash unit emits a
test flash (relays confirmation of subject).
3 The flash unit directly connected to the camera emits a test
flash (relays flash output to the wireless flash unit not directly
connected to the camera).
* The flash unit directly connected to the camera will emit a test flash
one more time after this to relay the flash duration time when HS b
(Highspeed sync) is set.
4 The wireless flash unit connected to another flash unit
discharges as main flash.
When the wireless mode of the external flash on the camera is set to
[MASTER] or [29. Flash in Wireless Mode] (p.146) is set to [On] for the
built-in flash, all the flash units will discharge simultaneously.