[Rugo]

Hi all, or should I say dear Dorothy Dix

A friend on mine has decided to get a mirror made to particular specifications. When he asked the supplier for some information on the quality of the mirror he was told "We use a null test so we do not need to supply any measurements with our mirrors." My friend thought this was bizarre and pressed the point. 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.

Should my friend simply accept the word of the mirror maker on trust?

Has anyone in this forum ever had a similar experience and if so, what did they do? (I have seen a website of a mirror maker in the US that also makes the same claim as the 'mirror maker' above.)

At the end of the day, I suppose my friend can go to someone else. He probably will.

Cheers
Rugo