Nikon D100 Manual page 170

Custom Settings
Custom Setting 22: AF Assist
This option controls whether the AF-assist illumi-
nator lights to help with the autofocus operation
when the subject is poorly lit (
Option
ON
(default)
OFF
Custom Setting 23: Flash Mode
By default, the amount of light produced by the
built-in Speedlight is controlled automatically us-
ing D-TTL flash control (
you can set the built-in Speedlight to fire at full
output with every photograph (manual mode).
Option
D-TTL auto flash
(default)
Manual flash
158
72).
AF-assist illuminator lights automatically when subject is poorly
lit.
AF-assist illuminator off.
95). Using this option,
When built-in Speedlight is raised, flash output is adjusted au-
tomatically in response to shooting conditions (
output can be adjusted using flash exposure compensation (
102).
When built-in Speedlight is raised, flash fires at full output with
every shot (GN at ISO 200 18/59, at ISO 100 12.7/42, m/ft).
Flash exposure compensation indicators (
and viewfinder blink on and off. No monitor pre-flash is emit-
ted, allowing the built-in Speedlight to function as a master
flash to drive optional slave flash units.
CSM MENU
F22 AF Assist
Illuminatior
ON
ON
OFF
OFF
Description
CSM MENU
F23 Built-in
Flash Mode
D-TTL auto flash
Manual flash
Description
OK
OK
99). Flash
) in control panel