Olympus E-3 User Manual page 20

button on the front face of the E-3 will automatically switch the camera
to live view mode with the aperture stopped-down to permit viewing of
depth of field on the monitor. So, if your camera has ever appeared to
"...suddenly switch to live preview mode for no reason..." check your
setting of the Fn button!
Right, now back to the top of the camera. Dominating this is the
LCD display. The graphic below shows you the most common
indications you could see on the display and their equivalents in
the viewfinder display
Other indications will appear as and when you press a function
and/or setting button.
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