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Hi Stefan
That looks like a great result. Am I reading the graph correctly - it looks like the largest error at 35 mm radius is about 1/16 wave on the wavefront? If so, that’s fantastic. You were obviously very careful with your original testing.
I’m new to interferometry but now have all the parts to complete a bath. Can you analyse the interference fringes for the secondary with DFTfringe?
Rod
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