Nikon D800 - Manual (Page 205)

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Flash Photography
The built-in flash has a Guide Number (GN) 12/39 (m/ft, ISO 100,
20 °C/68 °F) and provides coverage for the angle of view of 24 mm
lens, or a 16 mm lens in DX format. It can be used not only when
natural lighting is inadequate but to fill in shadows and backlit
subjects or to add a catch light to the subject’s eyes.
1
Choose a metering method
(
0 115).
Select matrix or center-weighted
metering to activate i-TTL balanced fill-
flash for digital SLR. Standard i-TTL flash
for digital SLR is activated automatically
when spot metering is selected.
2
Press the flash pop-up button.
The built-in flash will pop up and begin
charging. When the flash is fully
charged, the flash-ready indicator (
c)
will light.
Using the Built-in Flash
Metering selector
Flash pop-up button