Free and open source fringe analysis software is available, see FringeXP or Open Fringe for two good ones. Check the latter first as Dale is the one doing a lot of the Bath work.
If it wasn't clear in my earlier post, I should point out that Bath doesn't require nulling optics for aspheres at ROC, the fringes are captured very densely and estimates of the SA are used to null the results digitally. There are some limits, as in if you have a LOT of SA and not a lot of resolution on the IFs the results will not carry much resolution either.
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