Canon EOS 5DS R Instruction Manual - Page 98

AF Area Selection ModesN When AI Servo AF mode is set with 61-point automatic selection AF, or Zone AF (manual selection of zone), the active AF point will keep switching to track the subject. However, under certain shooting conditions (such as when the subject is small), it may not be able to track the subject. Also, in low temperatures, the tracking response may become slower. With Single-point Spot AF (manual selection), focusing with an EOSdedicated, external Speedlite's AF-assist beam may be difficult. If a peripheral AF point or a wide-angle lens is used, achieving focus may be difficult with an EOS-dedicated, external Speedlite's AF-assist beam. In such a case, use an AF point closer to the center. When the AF point(s) light up, part or all of the viewfinder may light up in red. Also, if [z4: Crop/aspect ratio] is set, the semi-transparent, masked area may light up in red. This is a characteristic of the AF point display (using liquid crystal). In low temperatures, the AF point's display may be difficult to see. This is a characteristic of AF point display (using liquid crystal). With [24: 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 (p.126). With [24: Selectable AF point], you can change the number of manually selectable AF points (p.124). 98