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The DOESAG.zpl macro posted on this site doesn't appear to accurately determine the diffractive sag.  





Anyone else think this is the case?
Hey Alex,





Where is that macro? I couldn't find it through the search.
It can be found here: https://my.zemax.com/en-US/Knowledge-Base/kb-article/?ka=KA-01501





 
Looks OK to me, at least in principle. What specifically do you not agree with?
I believe it works only if system units are millimeters, not inches.  





 
This Rx in inches.


 

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