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I believe that sensitivity of Ronchi tests depends greatly on type of scope being tested. The "defects" you are seeing here may well be within tolerance limits for high quality mirrors. You need to talk to someone who knows how to interpret these tests for a given scope.
E.g. my Dobs Ronchi test just about perfect, but the 4" Mak shows wavy fringes. But for its small aperture the Mak performs very well for its aperture at high powers.
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