Auto Distortion Control; Built-In Af-Assist Illuminator - Nikon D3400 Reference Manual

Auto Distortion Control

Select On to reduce barrel distortion when shooting with wide-
angle lenses and to reduce pin-cushion distortion when
shooting with long lenses (note that the edges of the area visible
in the viewfinder may be cropped out of the final photograph,
and that the time needed to process photographs before
recording begins may increase). This option does not apply to
movies and is available only with type E and G lenses (fisheye,
and certain other lenses excluded); results are not guaranteed
with other lenses.
A
Retouch: Distortion Control
For information on creating copies of existing photographs with
reduced barrel and pin-cushion distortion, see page 237.

Built-in AF-assist Illuminator

Choose whether the built-in AF-assist
illuminator lights to assist the focus
operation when lighting is poor.
Option
On
Off
196 C The Shooting Menu: Shooting Options
The AF-assist illuminator lights when lighting is poor (for
more information, see page 284).
The AF-assist illuminator does not light to assist the focus
operation. The camera may not be able to focus using
autofocus when lighting is poor.
G button ➜ C shooting menu
G button ➜ C shooting menu
AF-assist illuminator
Description