Alternative shutter release button – Nikon F4 User Manual
Page 119
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ALTERNATIVE SHUTTER RELEASE BUTTON
A shutter release button is provided at the bottom of the High Speed Battery Pack
MB-21, This is convenient for vertical-format shooting.
When not using the MB-21’s shutter
release button, set the lock lever — so
the red index is hidden — to prevent
unwanted shutter release.
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