Numerical Nulling with MetroPro

[Michael Koch]

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

[Michael Koch]

Problem solved, I found out how it works.

Michael