Re: [ATM] What would you do??

["Scott Ewart" <scotte@frontiernet.net>]

|

| star-test shows a good round-disk, with some 
descent-rings!,[average-night of seeing]
| |
| What would you advise??[and be honest!].
|
| John.
|
|
|
John,
    As a first-time mirror maker, I assume also that he is a 
first-time mirror tester.  The best test is, of course, the star test. 
All the numbers in the world don't mean a thing unless the star test 
is good.  It sounds like the surface looks smooth indoors and that's 
also very important.
    While doing a star test and looking at the image on either side of 
focus (about 4 or 5 rings visible), do you see good ring structure on 
both sides?  If so, I'd say the mirror is "good enough", but maybe not 
great.  If the image looks almost identical (the amount of light in 
each ring) on both sides of focus, DON'T TOUCH IT!  It will be 
excellent and you'll always be happy with it.
    If you see good ring structure on only one side of focus and the 
other side is a bit fuzzy, you should keep figuring.  Be sure the 
mirror is fully cooled to ambient temperature (at least an hour) 
before testing.

Scott


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