Pentax IST DS2 - Manual (Page 158)

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With the AF360FGZ, you can discharge the flash to take a picture at a
shutter speed faster than 1/180 second. High-speed flash sync can be
used with the flash attached to the camera, or wireless.
Attaching and Using the AF360FGZ on the Camera
1 Remove the hot shoe cover and attach the AF360FGZ.
2 Turn the mode dial and set the exposure mode to b or a.
3 Turn on the AF360FGZ.
4 Set the AF360FGZ sync mode to HSb (high-speed flash sync.).
5 Confirm that the AF360FGZ is fully charged and then take the picture.
Shoot using the flash without connecting the camera and flash with a cord
by using two AF360FGZ units.The High-speed sync mode is also available
in wireless mode.
Using High-Speed Flash Sync Mode
• The b will light in the viewfinder when the flash is ready (fully charged).
• High-speed flash sync is only available when the shutter speed is faster than
1/180 sec.
• High-speed flash sync is not available when the exposure mode is set to p
(Bulb).
Using in Wireless Mode
Be sure to set the two AF360FGZ units to the same channel. See the
AF360FGZ operating manual for details.