ead about them. This is the end of lesson #5.</p>

<h2>Lesson #6 - Draw the Lens</h2>

<p>There are a great many graphics options. You don't
need to know them all to draw the lens. To see XY, XZ, YZ and
orthographic projections of the current lens, just issue one of the
  following commands:</p>

<p><strong>VIE XY 3 </strong>(You must enter
an explicit scale factor when an XY view is requested and 3 is a good
  value using this lens.)<br>
  <strong>
  VIE XZ<br>
  VIE YZ<br>
  VIE ORTHO<br>
</strong></p>

<