Quote:
Originally Posted by Rugo
. Again he was informed that certificates of surface accuracy were not needed when a null test was used. The strange thing about this is that my friend tells me the mirror maker has a reasonable reputation.
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Regardsless of the test method, it is pretty hard for a simple number to reflect the myriad of possible conditions at the micro and macro scale that go to make an optical surface. Interferometers apply after the Null test are just another way to characterise in simple terms what the optician allready knows,that a mirror is finished: they are not a magical bullet or an independant test in themselves. Pieces of paper may or may not reflect a mirror's true condition but reputations one from consistantly good product over a long period of time are of far more guidance. At the end of the day , trust what your eyes see because pieces of paper are just that.
Mark