Canon EOS 5D Mark III Instruction Manual page 105

If [All by same amount] is selected, AF adjustment will not be possible for
the wide-angle and telephoto ends of zoom lenses.
3 Fine Adjustment of AF's Point of FocusN
4
Make the adjustment.
Turn the <5> dial 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>.
Turn the <5> dial to select [All by

same amount], then press <0>.
The menu will reappear.
5
Check the result of the
adjustment.
Take a picture and play back the

image (p.244) 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.
" will shift the
" will shift the
" side. When the
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