Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 130)

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Selecting the AF Area and AF Point (Viewfi nder Shooting)
o AF points may not track subjects under some shooting conditions when AI
Servo AF is used with Zone AF, Large Zone AF, or Automatic selection AF.
o Focusing may be diffi cult when using a peripheral AF point or a wide-angle or
telephoto lens. In such a case, use the center AF point or an AF point close to
the center.
o When the AF point(s) light up, part or all of the viewfi nder may light up in red.
This is a characteristic of AF point display.
o In low temperatures, the AF point display may be diffi cult to see or have a
slower tracking response due to the characteristics of AF point display device
(using liquid crystal).
o With [
8
C.Fn II-10: Orientation linked AF point] , you can set the AF area
selection mode + AF point or only the AF point separately for the horizontal
and vertical orientations ( = 565).