Pentax K-r Operating Manual page 36

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Set the mode dial to Tv.
Use the e-dial to set the shutter speed.
The background is not properly exposed if the aperture value is blinking
when the shutter speed is set. Adjust the shutter speed so that the
aperture value does not blink.
Press the _UP/'_ button.
The built-in flash pops up.
Take a picture.
i!i _ _lii_ i!i
1 Set the mode dial to P, Sv or Av.
2 Press the _UP/'_ button.
The built-in flash pops up.
3 Press the four-way controller (T).
The [Flash Mode]screen appears.
Select s_wor _. and press the
OK
button.
The shutter speed is set slower to give a proper exposure for the
background.
Take a picture.