Pentax K-5 Operating Manual page 128

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AE Lock is a function that locks the exposure prior to taking a picture. Use
this when the subject is too small or is backlit and a proper exposure
setting cannot be obtained.
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Set the exposure and press the
AE-L button.
The camera locks the exposure
(brightness) at that instant.
-X- is displayed in the status screen and
viewfinder while the AE Lock is engaged.
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• The exposure remains locked as long as the AE-L button is kept pressed or
the shutter release button is kept pressed halfway. The exposure remains
locked for twice the amount of the exposure metering timer (p.118) even after
taking your finger off the AE-L button.
• You will hear a beep when the AE-L button is pressed. The beep can be
turned off. (p.288)
• AE Lock is not available in BB (Green), B (Bulb) or X (Flash X-sync Speed) mode.
• When any of the following operations are performed, AE Lock is canceled.
- the AE-L button is pressed again
- the r-€] button. MENU button or INFO button is pressed
- the mode dial is turned
- the ens is changed
- a lens with an A (Auto) position is set to a position other than the A position
• 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 whose maximum aperture value 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.131)
Changing the Exposure Automatically when Shooting
Auto Bracketing is a function for continuously shooting images with
the exposure automatically adjusted for underexposure and
overexposure. Each time the shutter release button is pressed, 2, 3
or 5 shots are taken. Refer to "Shooting while Adjusting the Settings
(Auto Bracketing)" (p. 157).