Nikon D3200 Reference Manual page 36

Choose the flash mode for the built-in flash in R S,A, and M modes.
___o_O_i_tio__n_,,_ .......... :_o_,_,_,_,_=_,__ .... _'-_O°e__ip_io_'_:_--':':':':':':':':':'
TTL_TTL Flash output is adjusted automatically in response to shooting conditions.
Choose a flash level between Full and 1/32 (V32 of full
power). At full power, the built-in flash has a Guide
Mf_ Manual Number of 13/43 (m/ft, ISO 100, 20 °C/68 °F).
Manual
A _ icon flashes in the viewfinder and information display when
Manual is selected and the flash is raised.
The SB-400
When an optional SB-400 flash unit is attached and turned on, Flash
cntrl for built-in flash changes to Optional flash, allowing the flash
control mode for the SB-400 to be selected from TTL and Manual.
Flash Control
The following types of flash control are supported when a CPU lens is used in combination
with the built-in flash (_ 47) or optional flash units (_ 172).
• i-ffL Balanced Fill-Flash for DigitalSLR:Information from the 420-pixel RGB sensor is used to
adjust flash output for a natural balance between the main subject and the background.
• Standardi-TTLFill-Flash for DigitalSLR:Flash output is adjusted for the main subject; the
brightness of the background is not taken into account. Recommended for shots in which
the main subject is emphasized at the expense of background details, or when exposure
compensation is used.
Standard i-TTL flash control is used with spot metering or when selected with the optional
flash unit. i-TTL balanced fill-flash for digital SLRis used in all other cases.
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