Using The Built-In Flash; Setting The Flash Mode - Pentax K-x Operating Manual

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)).
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).
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
Auto Flash
C
Discharge
Manual Flash
b
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.
Discharges the flash manually. Discharges when the
flash is popped up, does not discharge when retracted.
Function
67
3