Canon 10x42L IS WP Instructions Manual page 11

The focusing range is about 2.5m to infinity. There is some margin at the
infinity end.
4
Adjust the diopter.
First look with the left eye only and
z z
adjust the focusing knob until the
object looks sharp.
Push the dioptric correction ring in the
z z
direction shown by the arrow until you
hear a click.
Then look with the right eye only at the
z z
same object while turning the dioptric
correction ring until the object looks
sharp.
Pull the dioptric correction ring toward
z z
you until you hear a click to secure the
diopter adjustment.
5
Adjust the focus.
Look through the eyepiece and turn
z z
the focusing knob until the object looks
sharp.
Before You Start
ENG-10