Pentax Optio WS80 Operating Manual page 29

* A4 varies depending on the following conditions.
f When the shutter release button is pressed halfway with the
[Pixel Track SR] in the [A Rec. Mode] menu set to P (Off) and
camera shake is likely to occur
M When [Pixel Track SR] is set to O
* B2 and B3 appear only when the shutter release button is pressed
halfway.
* When the shooting mode is b (Auto Picture) and if you press the
shutter release button halfway, the automatically selected shooting
mode appears in A1 even when "No Info" is selected (p.78).
* Some indications may not appear depending on the shooting mode.
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