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Addendum
Page 250
The two smaller charts were designed so that they can be cut and taped together in a
way that they can stand at a 45° angle when placed on a table, desk, or flat surface.
The camera / lens is then leveled and preferably positioned on a tripod so that the
lens’ centerline is aligned with the center of the chart. Place the lens as close as you
can to the center of the chart target while it can still focus on the intersection of the
black / white section, then back it off just a little. Position the large chart flat
(horizontally) and the camera / lens angled at 45° from the chart.
After choosing the chart that will work best with
your lens, and once the chart and camera / lens are
position correctly, start by trying to focus on the
white area of the chart. The lens should not be able
to focus correctly and it should be “hunting”. If it
achieves focus while pointing to the middle of the
white area, it means you could actually be in focus
with the lines surrounding the white area and you
need to use the next larger chart.