Pentax K20D Operating Manual page 149

HSb (High-speed sync) is not available when the camera is set to discharge
the built-in flash.
Wireless Shooting
Using a Combination of the Built-in Flash and an External Flash
Unit
1 Remove the external flash unit for which the channel was set on the
camera, and place at the desired location.
2 Set the flash mode of the camera to r , and pop up the built-in flash.
3 Confirm that both flashes are fully charged and then take the picture.
Using a Combination of External Flash Units
1 Set the wireless mode of the external flash directly connected to the
camera to [MASTER] or [CONTROL].
MASTER
CONTROL
2 On the wireless flash unit, set the wireless flash mode to [SLAVE] and
set the channel to the same channel as the camera. Then, place at the
desired location.
3 Confirm that both flashes are fully charged and then take the picture.
Shake Reduction is not available in Wireless mode.
Downloaded From camera-usermanual.com Pentax Manuals
Discharges both the flash directly connected to the camera and
the wireless flash unit.
The flash directly connected to the camera is discharged as a
test flash only and does not discharge as main flash.
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