Using Ae Lock; Action In M Mode - Pentax K-X Operating Manual

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Using AE Lock
If [10. AF/AE-L Button] in the [C Custom Setting 2] menu is set to [AE
Lock], you can press the AF/AE-L button to lock the exposure
value. (p.108)
Example) If the shutter speed is 1/125 sec. and aperture is F5.6 and
these settings are locked with the AF/AE-L button, the
aperture automatically changes to F11 if the shutter speed
is changed to 1/30 sec. with the e-dial.
Action in M Mode
You can set the function of the _) Button
(Green) button when the camera is set to
_Green
Button
M mode. Set in [Green Button] of the
[1_1 Rec. Mode 4] menu. (This operation e-dial in Program
is available only when [Green Button] is sets the aperture and
assigned to the _) (Green) button.
shutter
speed
to the
i (p.179)) ProgramLine exposure
Adjusts the aperture value and shutter speed to obtain the
P LINE proper exposure according to the Program Line. (default
setting)
Adjusts the shutter speed while the aperture value remains
Tv SHIFT fixed to obtain the proper exposure.
Adjusts the aperture value while the shutter speed remains
Av SHIFT fixed to obtain the proper exposure.
Disables the (_ button operation when the mode dial is set to
OFF M.