Pentax K-X Operating Manual page 52

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Using the optional external flash AF540FGZ, AF360FGZ, AF200FG or
AF160FC enables a variety of flash modes, such as P-TTL auto flash
mode, depending on the external flash being used. See the chart below for
details.
(_,/: Available #: Restricted
x: Not available)
Built'in AF540FGZ
Flash AF360FGZ
Red-eye reduction flash _
Auto flash discharge _
After the flash is charged, the camera ,,/ ,,/
automatically switches to the flash sync speed.
Aperture value is automatically set in P
mode and Tv mode. _
Auto check in the viewfinder × ×
P-TTL auto flash ,,/'I ,_/"I
Slow-speed Sync _
Flash exposure compensation ,,/ ,,/
AF assist light of external flash × ,,/
Trailing Curtain Sync .2 ,,/ ,,/
Contrast-control-sync flash mode #*3 ,,/
Slave flash × ,,/
Multiple flash × ×
High-speed flash sync ×
Wireless flash #*4 _ *5
AF2OOFG
AF160FC
x
,_/'I
x
x
#*4
x
x
x
x
"1 Available only when using a DA, DA L, D FA, FA J, FA, F or A lens.
*2 Shutter speed of 1/90 sec. or slower.
*3 When combined with the AF540FGZ or AF360FGZ, 1t3 of the flash discharge can be
output by the built-in flash and 2/3 can be output by the external flash.
*4 Available only when combined with the AF540FGZ or AF360FGZ.
*5 Multiple AF540FGZ or AF360FGZ units, or a combination of an AF540FGZ or AF360FGZ
unit and the built-in flash is required.
Flashes With reversed polarity (the center Contact on the hot shoe is minus)
Cannot be used due to the risk of damaging the Camera or flash.