Thank you for the info, the reason the fringes are not round is because i photographed it from a reflection on the wall and the camera was at 30 degrees to the fringes. The mirror test out excellent on a ronchi ross null test and so does it under the star test. I would not say this reference test was easy, it is very difficult to get larger fringes separation, this may because i use an plano convex lens from a microscope objective. Right now i am just having some fun trying to use it and understand it.
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