Variable => the results then depends on the merit function criterion (eg, it could be RMS Spot Radius) q'Pz3/mk
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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. Y:"v=EhB
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quick focus: this is take you to the location where RMS Spot Size is minimum. Ad`[Rt']kI