Re: [ATM] Ghosts in the Coulter

[Don R Surles <Don.R.Surles-1@usa.dupont.com>]

some of the red-tube coulters had collimation bolts that protruded thru 
the mirror cell and actually touched the back of the mirror.  a better 
cell might improve your image...an easy way to check this is to mount the 
mirror against bubble wrap (and run the collimation bolts back into the 
mirror cell).  another problemo with the red-tubes was the hose clamp 
connection...if the clamp  was too tight or the screw-apparatus was on the 
bottom of the mirror distortions were introduced.

don...






"Tim Hager" <thager6164@earthlink.net> 
Sent by: atm-bounces@atmlist.net
05/16/2007 12:05 PM

To
"Stephen Koehler" <s.c.koehler@gmail.com>
cc
atm@atmlist.net
Subject
Re: [ATM] Ghosts in the Coulter






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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