Olympus IS-1 - Manual (Page 41)

Fill-in flash
In this mode, the flash always fires regardless of available light. Use this mode for
daylight shooting with backlit conditions to compensate for backlighting.
*Check to make sure that the exposure mode is
set on P (Program) as indicated by the LCD
panel.
NOTE: Fill-in flash will not operate while in Night
scene mode or Portrait zoom mode.
—Even with backlit conditions, proper exposure of
the subject can be achieved by ESP metering.
However the background will be overexposed.
*Slide the flash switch to activate the flash.
—flash will pop-up.
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