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Re: [ATM] Help with star test interpretation - TUE,SA or something else?

I have not found the ronchi grating star test to be
very sensitive, but maybe I'm missing something.
Guy

--- Bob May <bobmay@nethere.com> wrote:

> Grab your Ronchi grating and test the completed
> scope with that.  Straight
> lines indicate a good mirror while curved lines on a
> star indicate that
> you're either over or under corrected and wavy lines
> indicate that there is
> a bit of zone problems going on with your scope.
> >From what you've indicated, you don't have a good
> shape yet as the inner
> part of the scope is more closer to the proper shape
> than the rest of the
> surface.
> Bob May
> bobmay@nethere.com
> http://nav.to/bobmay
> http://bobmay.astronomy.net
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


Guy  Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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