Olympus E-420 - Manual (Page 89)

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AEL / AFL
You can use the AEL / AFL button to perform AF or metering operations instead of using the
shutter button.
Select the function of the button to match the operation when the shutter button is pressed.
Select [mode1] to [mode4] in each focus mode. (You can only select [mode4] in C-AF mode.)
Basic operations
[mode1]
For determining the metered exposure while focusing. AE lock is activated while
pressing the
AEL / AFL button, allowing you to adjust the focus and determine
the exposure separately.
[mode2] For determining the exposure when you press the shutter button fully. This is
useful for shooting scenes with significant changes in lighting, such as on a stage.
[mode3] For focusing with the AEL / AFL button instead of the shutter button.
[mode4] Press the AEL / AFL button to focus, and press the shutter button fully to
determine the exposure.
AEL / AFL MEMO
You can lock and maintain the exposure by pressing the AEL / AFL button.
[ON] Press the AEL / AFL button to lock and maintain the exposure. Press again to
cancel the maintaining of the exposure.
[OFF] The exposure will be locked only while the AEL / AFL button is pressed.
Mode
Shutter button function AEL / AFL button function
Half-press Full press When holding down AEL / AFL
Focus Exposure Focus Exposure Focus Exposure
[S-AF]
mode1 S-AF Locked k k k Locked
mode2 S-AF k k Locked k Locked
mode3 k Locked k k S-AF k
[C-AF]
mode1 C-AF start Locked Locked k k Locked
mode2 C-AF start k Locked Locked k Locked
mode3 k Locked Locked k C-AF start k
mode4 k k Locked Locked C-AF start k
[MF]
mode1 k Locked k k k Locked
mode2 k k k Locked k Locked
mode3 k Locked k k S-AF k