Re: Star Test Question
Bratislav Curcic (epabcc@epa.ericsson.se)
Fri, 28 Apr 95 11:28:22 EST
This is the exact reason why star testing is NOT really a reliable
source for optical testing. In other words, it's not QUANTITATIVE. It
will tell you if you have perfect optics, but when it is NOT perfect,
it is very difficult to tell what is wrong and more importantly BY HOW
MUCH.
Your case sounds to me as a typical UNDERCORRECTED mirror, i.e. outher
zones focus closer than a central ones. But there is so many possible
causes for symptoms you've described that is almost impossible to say
without actually looking thru. Why don't you take a Ronchi grating and
have a look ? That will immediately tell you the full story.
Bratislav