From: astroelectronic@t-online.de   
      
   Hi all,   
      
   does anybody know how to make numerical nulling with Zygo's MetroPro?    
   If I test a mild asphere against a transmission sphere, the result contains a   
   lot of spherical aberration (Z8). The expected Z8 value can be calculated in   
   advance, based on the known conic constant of the asphere. How can the   
   expected spherical    
   aberration be subtracted from the result, so that only the remaining errors   
   are shown?    
   I know how it works with IntelliWave, but now I want to figure out how it   
   works with MetroPro.   
      
   Thanks,   
   Michael   
      
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