Canon EOS 5Ds Instruction Manual page 475

The AF points do not light up in
red.
The AF points light up in red when focus is achieved in low-light
conditions.
In the <d>, <s>, <f>, <a>, and <F> modes, you can set
whether to have the AF points light in red when focus is achieved
(p.132).
The continuous shooting speed is slow.
The continuous shooting speed may become slower depending on the
shutter speed, aperture, subject conditions, brightness, lens, flash use,
temperature, battery type, remaining battery level, etc. (p.143).
In AI Servo AF operation, the continuous shooting speed may become
slower depending on the subject conditions and lens used (p.143).
If you use Battery Pack LP-E6 and shoot in low temperatures (battery
temperature is low), the high-speed continuous shooting speed may
become slower (p.143).
The continuous shooting speed may become slower if the remaining
battery level is low or if you shoot under low-light conditions (p.143).
If you use Battery Grip BG-E11 (sold separately) with AA/R6 batteries,
the maximum continuous shooting speed will be approx. 3.0 fps for
high-speed continuous shooting.
If you set [z4: Anti-flicker shoot.] to [Enable] and shoot under a
flickering light source, the continuous shooting speed may decrease
slightly, the shooting interval may become irregular, or the release
time lag may become longer (p.191).
The maximum burst during continuous shooting is lower.
If you shoot something that has fine detail such as a field of grass, the
file size will be larger, and the actual maximum burst may be lower
than the number mentioned on page 151.
Troubleshooting Guide
475