Canon EOS 5Ds Instruction Manual page 123

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Lens drive when AF impossible
If focus cannot be achieved with autofocus, you can have the camera
keep searching for the correct focus or have it stop searching.
Super telephoto lenses, etc., with a wide focusing drive range can become
grossly out of focus during focus search, taking more time to achieve focus
next time. Setting [Stop focus search] is recommended.
3 Customizing AF FunctionsN
ON: Continue focus search
If focus cannot be achieved with
autofocus, the lens is driven to search
for the correct focus.
OFF: Stop focus search
If autofocus starts and the focus is far
off or if focus cannot be achieved, the
lens drive will not be performed. This
prevents the lens from becoming
grossly out of focus due to focus
searching.
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