High-speed sync is not available with the built-in flash.
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High-speed flash sync is not available when the exposure mode is set to (Bulb Exposure).
Select an exposure mode which allows you to set the shutter speed.
3 Turn on the camera and the external flash.
4 Set the external flash sync mode to HSb (High-speed flash sync).
5 Confirm that the external flash is fully charged and then take a picture.
The b will light in the viewfinder when the flash is ready (fully charged).
High-speed flash sync is available only when the shutter speed is set faster than 1/180 sec.
Set the exposure mode to e, b, Lor a.
2
Remove the cover of the hot shoe and attach the external flash.
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• For details such as operation method and effective distance, please refer to the external flash manual.
• The flash does not discharge if the subject is bright enough when the flash mode is Cor i. Therefore, it may not be suitable for Daylight-Sync shooting.
• Never press the Ebutton when any external flash unit is attached to the camera. The built-in flash will hit the external flash. If you want to use both at once, set the wireless mode or connect them using the extension cord. (p.173)
Using High-Speed Flash Sync Mode
With the AF540FGZ or AF360FGZ, you can discharge the flash to take a picture at a shutter speed faster than 1/180 second.

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