Canon EOC-1DX Instruction Manual page 103

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 Focus
Make the adjustment.
4
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.
Check the result of the
5
adjustment.
Take a picture and play back the
image (p.246) 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, repeat the adjustment.
" will shift the
" will shift the
" side. When the
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