Canon EOS 6D Instruction Manual page 315

If [1: All by same amount] is selected, AF adjustment will not be possible
for the wide-angle and telephoto ends of zoom lenses.
5
Make the adjustment.
Press the <U> key to make the
adjustment. The adjustable range is
±20 steps.
Setting it toward "-:
point of focus in front of the standard
point of focus.
Setting it toward "+:
point of focus to the rear of the
standard point of focus.
After making the adjustment, press
<0>.
Select [1: All by same amount], then
press <0>.
Press the <M> button to exit.
6
Check the result of the
adjustment.
Take a picture and play back the
image (p.236) to check the
adjustment result.
When the resulting picture is focused
in front of the targeted point, adjust
toward the "+:
resulting picture is focused behind the
targeted point, adjust toward the
"-: " side.
If necessary, do the adjustment
again.
8: AF Microadjustment
" will shift the
" will shift the
" side. When the
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