f5: Assign Preview Button

Choose the role played by the depth-of-field preview button, either by itself ([Preview button press]) or when used in combination

with the command dials ([Preview + command dials]). The options available are

the same as for [FUNC. button press] (pg. 302) and [FUNC. button+dials] (pg. 304),

except that the default option for [Preview button press] is [Preview] and the default setting for [Preview + command dials] is [None].

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