Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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Fine adjustment of the AF’s point of focus is possible for viewfinder 
shooting. This is called “AF Microadjustment”. Before making the 
adjustment, read “General Cautions for AF Microadjustment” and 
“Notes for AF Microadjustment” on page 157.
Set the adjustment amount manually by repeatedly making 
adjustments, shooting, and checking the results until the desired result 
is achieved. During AF, regardless of the lens used, the point of focus 
will always be shifted by the adjustment amount.
1
Select [AF Microadjustment].
 
Under the [25] tab, select [AF 
Microadjustment
], then press <0>.
2
Select [All by same amount].
3
Press the <B> button.
X
The [All by same amount] screen 
will appear.
3
 Fine Adjustment of AF’s Point of FocusN
Adjust All by Same Amount
Normally, this adjustment is not required. Perform this adjustment 
only if necessary. Note that performing this adjustment may prevent 
accurate focusing from being achieved.