Re: ATM 14.5........focal legnth..72 .312

[Marty.T@t-online.de (Martin Trittelvitz)]

natsp schrieb:
> 
> yea..
> that made sense to me..
> but now im working on the ronchi thing.
> my ronchi test looks fuzzy,is that normal?
> all the ronchi pic's i see show the lines clear.
> cant get to your home page it worked the other day.
> take care
> stan
> 
Hy!
Yes the Ronchi looks fuzzy mostly, because the slit is not parallel to
the knife. Or because the slit is too wide, or because of the
diffraction. The Ronchi is mostly fuzzy! I prefer the Ronchi only at the
star, when the scope is ready. Then the lines have to be strait . You
can test a sphere, there the lines have to be strait too. The parabol is
better tested with foucault
marty

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