Variable => the results then depends on the merit function criterion (eg, it could be RMS Spot Radius) :l3Tt<
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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. iOki ZN+d>
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quick focus: this is take you to the location where RMS Spot Size is minimum. gyI5;il~