Pentax K-X - Manual (Page 69)

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Using the Built-in Flash
Use the following procedures to take pictures in low light or backlit
conditions or when you want to use the built-in flash.
The built-in flash is optimum at about 0.7 m to 5 m from the subject.
Exposure will not be properly controlled and vignetting (darkening of the
corners of the image due to a lack of light) may occur when used at a
distance closer than 0.7 m (this distance varies slightly depending on the
lens being used and the set sensitivity (p.160)).
For details on the built-in flash and instructions on how to take pictures with an
external flash, refer to the “Using the Flash” (p.155).
Setting the Flash Mode
Flash Mode Function
C
Auto Flash
Discharge
The camera automatically measures the ambient light
and determines whether to use the flash. The flash
pops up and discharges automatically when necessary,
such as when using a shutter speed likely to cause
camera shake or in backlit conditions (except when in
s
(Landscape), \ (Moving Object) or l (Night Snap)
in H (Scene) mode). The flash may pop up but may
not discharge if the camera determines that the flash is
not necessary.
b
Manual Flash
Discharge Discharges the flash manually. Discharges when the
flash is popped up, does not discharge when retracted.
Compatibility of built-in flash and lens
Vignetting may occur depending on the lens being used and the
capture conditions. We recommend taking a test shot to check the
compatibility.
1 Lens Compatibility with the Built-in Flash (p.161)
• When using the built-in flash, remove the lens hood before shooting.
• The built-in flash fully discharges for lenses without a function to set
aperture lens ring to s (Auto).