Pentax K-R Operating Manual page 56

2
Press the four-way controller (_)
and use the four-way controller
(A T) to select [AE Lock].
AF/AE-L Button
3 Press the
OK
button.
Press the
MENU
button twice.
The camera is ready to take a picture.
Set the exposure and press the
AF/AE-L button.
The camera locks the exposure
(brightness) at that instant.
-)(-is displayed in the status screen and
viewfinder while the AE Lock is
engaged.
- The exposure remains locked as long as the AF!AE-L button is kept
pressed or Ehe shutter release button is kept pressed halfway. The exposure
remains locked for twice the amount of the exposure metering timer [p. 116)
even after taking your finger off the AF/AE-L button.
• You will hear a beep when the AF!AE-L button is pressed. The beep can
be turned off, (p,269)
• AE Lock is not available when the shutter speed is setto Bulb
• When any of the following operations are performed. AE Lock is canceled.
- the AF!AE-L button is pressed again
- the _ button. MENU button or INFO button is pressed
- the mode dial is turned
- the lens is changed
- the lens with an A (Auto) position is set to other than the A position
o The combination of shutter speed and aperture value changes depending on
the zooming position even while the AE Lock is engaged when using a zoom
lens for which the maximum aperture varies depending on the focal length.
However. the exposure value does not change and a picture is taken at a
brightness level set when the AE Lock is activated.
• The exposure can also be locked when the focus is locked. Set in [5. AE-L
with AF Locked] of the [C Custom Setting 1] menu. (p.133)