Re: [ATM] Ghosts in the Coulter

["Tim Hager" <thager6164@earthlink.net>]

You're most likely correct Steve.  To my eye the images in the sketch seemed
to make a triangular pattern as if the mirror were pinched by 3 clips or
rigidly glued to a solid support at three places.  That's what made me think
of it.

Tim Hager
New Milford, CT

-----Original Message-----
From: Stephen Koehler [mailto:s.c.koehler@gmail.com]
Sent: Wednesday, May 16, 2007 10:52 AM
To: Tim Hager
Cc: vorblesnak@peak.org; atm@atmlist.net
Subject: Re: [ATM] Ghosts in the Coulter


Tim,

On 5/16/07, Tim Hager <thager6164@earthlink.net> wrote:
> I missed the beginning of this thread but this looks like pinched or
warped
> optics to me.  How are the primary and secondary mirrors mounted?  Are
> either of them glued or too tightly pinched in their mountings?

It seems unlikely to me that a pinched primary or secondary would
cause this problem.  Both the primary and secondary on a Coulter are
sufficiently thick that the deformation imparted by pinching would be
relatively smooth deformations.  That doesn't agree very well with
multiple, relatively sharp, ghosts.

<Snip>
--
Steve Koehler

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