Nikon D5600 Reference Manual - English - Page 263

a3: Built-in AF-assist Illuminator G button ➜ A Custom Settings menu Choose whether the built-in AF-assist illuminator lights to assist the focus operation when lighting is poor. AF-assist illuminator Option On Off Description The AF-assist illuminator lights when lighting is poor (for more information, see page 342). 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. a4: Rangefinder G button ➜ A Custom Settings menu Choose On to use the exposure indicator to determine whether the camera is correctly focused in manual focus mode (0 95; note that this function is not available in shooting mode M, when the exposure indicator instead shows whether the subject is correctly exposed). Indicator Description Subject in focus. Focus point is slightly in front of subject. A Custom Settings: Fine-Tuning Camera Settings 237