作者69647133@qq.com(嬉皮又笑脸，任它东风过)
文章完整地址http://69647133.qzone.
qq.com/blog/1294843971
Variable => the results then depends on the merit function criterion (eg, it
could be RMS Spot Radius) Marginal Ray height => when Pupil Zone setting is
0, you are focus on paraxial focal plane; useful when your system is close to
paraxial region. If Pupil Zone is not 0 real ray tracing is used, In general,
it' risky to use this option as you only use marginal ray to determine where
you focal plane is going to be. quick focus: this is take you to the location
where RMS Spot Size is minimum.