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 Hello, I have the following surface table. I am working in NS mode. My question is if I wanted to reverse surface 1 and 2.  I have two methods place it on surface 1 and then rotate it 180 degrees.  My sesond option would be to apply all the terms to the second surface of the even asphere.  As per normal the Rc becomes negative but what do you do with the other terms (k, A4, A6 etc).  Do they change sign?

 

Hey Michael,

If you want to make S1 the rear surface, then the Rc and A4-A12 should have the opposite signs, but the K (conic constant) should remain the same sign.


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