4. Press the OK button to lock in the setting.
Here are descriptions of how On or Off affects the AF-assist
illuminator:
▪ On (default) – If the light level is low, the AF-assist
illuminator lights up to help light the subject enough for
autofocus. This only works in certain modes, though:
1. Single-servo AF as a Focus mode at any time it’s
needed
2. Auto-area AF as an AF-area mode at any time it’s
needed
3. Single-point AF and Dynamic area AF as an
AF-area mode if you are using only the center AF
point as the selected sensor
▪ Off – The AF-assist illuminator does not light up to help
you in low-light autofocus situations. The camera may
not be able to autofocus in very low light.
My Recommendation: I leave Built-in AF-assist illuminator
set to On most of the time. It is only activated when the light
is low enough to need it. However, let me qualify this for
specific circumstances.
If you are trying to take pictures without being noticed, such
as from across the room with a zoom lens or while doing
street photography, you certainly don’t want this extremely
bright little light drawing attention when you start autofocus.
Or, you may be shooting wildlife, such as a giant grizzly bear,
and surely don’t want to call attention to yourself by shining a
bright light into the old bear’s eyes.
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