Pentax K110D - Manual (Page 160)

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With the AF540FGZ or 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 AF540FGZ or AF360FGZ on the Camera
1 Remove the cover of the hot shoe and attach the external flash
(AF540FGZ or AF360FGZ).
2 Turn the mode dial and set the exposure mode to b or a.
3 Turn on the camera and the external flash.
4 Set the external flash sync mode to HS b (high-speed flash sync).
5 Confirm that the external flash is fully charged and then take the picture.
You can shoot using the flash without connecting the camera and flash
with a cord by using two external flashes (AF540FGZ or AF360FGZ). 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 external flashes (AF540FGZ or AF360FGZ) to the same
channel. See the AF540FGZ or AF360FGZ operating manual for details.