| http://www.w3.org/ns/prov#value | - If the secondary was re-touched to balance out astigmatism, the effect of a secondary that is not aligned will be that there will be astigmatism in the image and this is very easy to check for.I would advise the use of an artificial star for this test because seeing is rarely good enough to test unless the astigmatism is quite pronounced.You can start with a real star tough.Rack your mirror out of
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