Pentax K-X - Manual (Page 73)

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When the mode dial is set to a (Flash Off), the built-in flash will not pop up
even if the K/i button is pressed.
Using red-eye reduction flash
“Red-eye” is the phenomenon where eyes look reddish in
photographs taken in dark environments with a flash. This is caused
by the reflection of the electronic flash in the retina of the eye.
Red-eye occurs because pupils are dilated in dark environments.
This phenomenon cannot be averted but the following measures can
be used to combat it.
• Brighten the surroundings when shooting.
• Set to wide angle and move closer to the subject if a zoom lens
is in use.
• Use a flash that supports red-eye reduction.
• Position the flash as far away from the camera as possible when
using an external flash.
The red-eye reduction function on this camera reduces red-eye by
discharging the flash twice. With the red-eye reduction function, the
pre-flash is discharged just before the shutter is released. This
reduces pupil dilation. The main flash is then discharged while the
pupils are smaller, reducing the red-eye effect.
To use the red-eye reduction function in Picture mode or
H (Scene)
mode, select D or F. Set to F or H in other modes.