Pentax K20D User Manual page 148

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].
Discharges both the flash directly connected to the camera and
MASTER
the flash connected to another flash unit.
The flash directly connected to the camera is discharged as a
CONTROL
test flash only and does not discharge as main flash.
2 On the flash connected to another 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.
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