Re: [APML] Focus stability and carbon fiber tubes

["Steve Walters" <s-walters@comcast.net>]

Dave,

It really does matter. I don't have the C9.25 but every alum tube I've ever
used shifted focus in very noticeable ways. You will be restricted to
imaging only when the temperature is stable.

It's worth the hassle.

Steve...
www.StarryNights.us
astrophoto@comcast.net

----- Original Message ----- 
From: "David Ebbecke" <deebbecke@yahoo.com>
To: <astro-photo@seds.org>
Sent: Sunday, April 25, 2004 7:26 AM
Subject: [APML] Focus stability and carbon fiber tubes


> I recently ordered a C-9.25" carbon fiber XLT.  What
> arrived however was the aluminum tube.  I went with
> the carbon fiber specifically for astrophotography
> work because of what I've read regarding its thermal
> stability hence greater focus stability .  None of the
> posts I read were recent nor was there consensus.
> Wonder if anyone could share their knowledge on this
> topic.  I could exchange the tube but would rather not
> go through the hassle if it really doesn't matter.
> I'm currently doing digital SLR work (4-5 minute
> ungiuded stacked exposures) with a 4" refractor and
> wanted the C-9.25" to go a little deeper.  Thank you
> in advance.
>
> Dave Ebbecke
>
>
>
>
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