Re: [ATM] The 16 inch Ultrathin ronchi pics

[Ric Rokosz <radicell2@yahoo.com>]

--- Dale Eason <atmpob@yahoo.com> wrote:

> I think what you see in ronchi will vary as you
> rotate
> the mirror since it is not a figure of revolution. 

Dale,

I find your experiment witht the thin mirror
interesting,especially about the astig.There is one
point about your interferometer that has me
wondering,and that is the setup itself. You are using
a variant of the Bath setup.From the discussion on the
interferometer group if the two beams from the cube
exceed 5mm you induce astig. just by the limitations
of the Bath.Now your setup,from the photos I've seen
the seperation of the cube from the reflective mirror
is more like 12-16mm.Aren't you inducing a heck of a
lot of additional astig into the equation just by
virtue of this seperation.So much so that it skews all
your results?

Ric

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