Pentax K-50 - Using the High-Speed Sync Flash

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Using the Flash
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With an AF540FGZ or AF360FGZ flash unit, you can discharge a flash to
take a picture at a shutter speed faster than 1/180 seconds.
1 Remove the cover of the hot shoe, and attach the external
flash.
2 Set the mode dial to b or a.
3 Turn on the camera and the external flash.
4 Set the external flash sync mode to HSb (high-speed
sync).
5 Make sure that the external flash is fully charged, and then
take a picture.
The b will light in the viewfinder or Live View screen when the flash is
ready (fully charged).
Using the High-speed Sync Flash
• High-speed sync is available only when the shutter speed is set faster than
1/180 sec.
• High-speed sync is not available in p mode.
• High-speed sync is not available with the built-in flash.