Pentax K-5 Operating Manual page 164

Auto Bracketing is a function for shooting while automatically changing the
camera settings. There are two Auto Bracketing modes: Exposure
Bracketing and Extended Bracketing.
You can set Auto Bracketing Order in [8. Auto Bracketing Order] in the
[C Custom Setting 2] menu (p.91).
1 0 - + Standard -> Underexposed -> Overexposed (default setting)
2 - 0 + Underexposed -> Standard -> Overexposed
3 + 0 - Overexposed -> Standard -> Underexposed
4 0 + - Standard -> Overexposed -> Underexposed
You can take continuous pictures with different exposures when the
shutter release button is pressed. You can select to take 2 images
(Standard/+), 2 images (Standard/-), 3 images or 5 images. When taking _,,
3 pictures, the first image is exposed with no compensation, the second iiiiiiiiiiiiiiiiiiiiiii
image is underexposed (negative compensation) and the third image is iiiiiiiiiiiiiiiiiiiiiii
overexposed(positivecompensation), iiiiiiiiiiiiiiiiiiiiiii
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Standard exposure Underexposure Overexposure
,Exposure Biacketing is not available in the following situati0nsl
When the exposure mode is setto B (Bulb)
_ When HDR Capture isset
, Exp0su[e B[aCketing and MultiieXp0sure cannot be used at the same timel
The function selected last is used.