Pentax K-7 K-7 Manual - Page 177
Using High-Speed Flash Sync Mode, Turn on the camera and the external flash.
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• P-TTL auto is only available with the AF540FGZ, AF360FGZ, AF200FG or AF160FC flash unit. • The b will light in the viewfinder when the flash is ready (fully charged). • The flash does not discharge if the subject is bright enough when the flash mode is C or i. Therefore, it may not be suitable for daylight-sync shooting. • Never press the E button 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.180). • For details such as operation method and effective distance, please read the manual for the external flash. 175 Using the Flash 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 seconds. 5 1 Remove the cover of the hot shoe and attach the external flash (AF540FGZ or AF360FGZ) to the camera. 2 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 HSb (High-speed flash sync). 5 Confirm that the external flash is fully charged and then take the 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 faster than 1/180 seconds. • High-speed flash sync is not available when the exposure mode is set to p (Bulb).