<P>一直都没有非常搞得懂这个是如何定义的,在zemax的软件中有一栏是semi-diameter,看手册也没有搞得很明白,因此到这里来问了。</P>
<P>我把这段手册上的英文摘录部分到这里:</P>
<P>The size of each surface is described by the semi-diameter setting. The default setting is the radial distance to the aperture required to pass all real rays without clipping any of the rays. Typing a value for the semi-diameter column results in the character "U" being displayed to the value. The "U" indicates that the semi-diameter is user defined. When a user-defined semi-diameter is placed on a surface with refractive power (which is done by simply typing in a value in the appropriate column),and no surface aperture has been defined, ZEMAX automatically applies a "floating" aperture on the surface. A floating aperture is a circular aperture whose radial maximum coordinate is always equal to the semi-diameter of the surface.</P>
<P>没搞懂这个semi-diameter和radius有和区别?</P>
<P>还有那个floating aperture 也是没有搞得很清楚的。</P>