Pentax K-5 Operating Manual page 117

Turn the rear e_dial (',,,_,,_) while pressing the [] butto n to change the EV
compensati0n va!uel (p.119)
• The aperture value can be set in increments of 1/3 EV or 1/2 EV: Set the
exposure steps in [1: EV Steps] of the [C Custom Setting 1] menu. (p.120)
, The proper exPosure may not be obtained with the selected aperture value
when the sensitivity is not set to [AUTO] (p,95),
Exposure Warning
If the subject is too bright or too dark,
the shutter speed will blink on the status
screen and LCD panel and in the
viewfinder. When the subject is too bright, set the aperture to a
smaller lens opening (larger number), and when too dark, set the
aperture to a larger lens opening (smaller number). Once blinking
stops, you can take a picture with proper exposure.
Use a commercially available ND (Neutral Density) Filter if the subject
is too bright. Use a flash if it is too dark.
You can set both the desired shutter speed and aperture to take the
picture.
Automatically sets the sensitivity so that the manually set shutter speed
and aperture value will give the proper exposure according to the
brightness of the subject.
1 Set the mode dial to TAv.