Pentax K-500 Operating Guide

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You can use the P-TTL auto flash with an AF540FGZ, AF360FGZ, 
AF200FG or AF160FC flash unit. 
1
Remove the cover of the hot shoe, and attach the external 
flash.
2
Turn on the camera and the external flash. 
3
Set the external flash mode to [P-TTL].
4
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 P-TTL Auto Flash
For details such as operation method and effective distance, refer 
to the external flash manual. 
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. 
K-500.book  Page 255  Friday, June 14, 2013  2:29 PM