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Re: [ATM] Dobson mirrors and mirror test methods
That sounds like what he was trying to explain.
--- jeff newsom <triolian@earthlink.net> wrote:
> Hi folks -
> As to the query about testing one of Dobsons
> mirrors, this might be done fairly readily. I'll try
> to make it happen .
> TO INTERESTED PARTIES, (most already know
> this)what Dobson was explaining was that when you
> observe the diffraction rings OUTSIDE OF FOCUS,any
> line that is too bright (brighter than the
> others)indicates a zone that is too high(or flat as
> John likes to say). INSIDE OF FOCUS, a bright zone
> is too low. The problems with this method of testing
> are air steadiness and testing and working on your
> mirror during good spells of weather(Not to mention
> working at night). Not really a problem if time is
> not a factor.
> ---Jeff Newsom-----
>
Guy Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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