Nikon Autofocus Speedlight SB-24 - Manual (Page 76)

AUTOMATIC BALANCED FILL-FLASH
When the SB-24 is turned off and the scene’s brightness is
EV10 or higher, if the computer's multi-se'gment sensor detects
that the central subject is darker than the surrounding area by
at least 1.5EV, the viewfinder ready-light LED biinks, recom­
mending that you should use flash to brighten the picture.
(Note: the SB-24 must be turned off for this signal to operate.
The LED will not blink with the SB-24 In STBY or ON mode.)
Set the camera for Program exposure control and the SB-24 for
TTL exposure control. A balanced fill-flash picture will result,
automatically. It’s that easy.
When using the SB-24 or any other flash In the F-401s/N4004s
hot shoe, bullt-ln speedlight must remain In the down position.
You cannot use both speedlights at the same time. Using the
SB-24 relieves the camera’s power supply from operating the
built-in fiash, and you can expect the camera’s motor to be able
to power more rolls of film.
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