[APML] Focus stability and carbon fiber tubes

[David Ebbecke <deebbecke@yahoo.com>]

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 


	
		
__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25¢
http://photos.yahoo.com/ph/print_splash
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo