Nikon Camera F50 - Manual (Page 63)

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When subject brightness is insufficient, the ready-light
4 blinks inside the viewfinder when you lightly press
the shutter release button to activate the exposure meter.
Press the flash lock-release to release and activate the built-
in flash.
You can use the built-in flash anytime, regard-less of
ambient lighting. For example, if your subject is backlit, you
can use the built-in flash to illuminate your subject and fill in
shadows.
• When the built-in flash is activated, an accessory
Speedlight will not fire. When using a Speedlight, keep
the built-in flash in the locked-down position.
• For usable lenses, see page 55.
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