Canon EOS 5DS Instruction Manual page 87

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One-Shot AF for Still Subjects

Focus indicator

While you hold down the shutter button halfway, the focus will be

locked. You can then recompose the shot if desired.

If focus cannot be achieved, the focus indicator <o> in the viewfinder

will blink. If this occurs, the picture cannot be taken even if the shutter

button is pressed completely. Recompose the shot and try to focus again

or see "When Autofocus Fails" (p.140).

If [z1: Beep] is set to [Disable], the beeper will not sound when focus

is achieved.

After achieving focus with One-Shot AF, you can lock the focus on a

subject and recompose the shot. This is called "focus lock". This is

convenient when you want to focus on a peripheral subject not covered

by the Area AF frame.

f: Selecting the AF OperationN

Suited for still subjects. When you

press the shutter button halfway, the

camera will focus only once.

When focus is achieved, the AF point

that achieved focus will be displayed,

and the focus indicator <o> in the

viewfinder will also light up.

With evaluative metering (p.212), the

exposure setting will be set at the

same time as focus is achieved.