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Re: [ATM] How far from the telescope should an artifical starbeplaced
>He never bothered learning how to do the Foucault or Ronchi tests
> or any variations on that. He had a fairly easy way (for him) to tell
>what part of the mirror needed work based on where the
>out-of-focus lines were bright or dim, and depending on
> whether he was inside focus or outside focus
I am not going to fuel controversies about John Dobson, but
I would appreciate if there is anybody around who has had opportunity
to test mirror made by Dobson himself, with one of methods available
and used widely by atm-s (Foucault, interferometry, Ronchi).
And I wander how come that after his visit to atm club mentioned above
nobody asked him about details of this apocryphal
"fairly easy way (for him) to tell what part of the mirror needed work"
in order to make his method available to mases.
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