[ATM] Coulter Vs GSO mirrors

["Corona Australis" <corona_australis@westnet.com.au>]

Hi Folks,

Looking for informed opinions. I have been churning over the
idea of building my own dob style telescope. Using a 12" f/5
mirror supplied from GSO. However there is a Coulter 13.1" f4.5 
Pyrex mirror that has become available. I fully understand the
dynamics of the two mirrors ie: focal length and diameter are
different. I'm more interested in what wouldbe the better quality 
made mirror of the two, or would the two be of similar quality.
It's just that I have never heard anything of Coulter mirrors
and what their reputation is like. 

Or maybe lets say to you experienced telescope builders, if you
had to decide which mirror to use which one would you go for.
The Coulter mirror had been stored for some years with the 3M 
plastic protector still on it but has been removed and used 
recently. Where as a mirror from GSO would be brand new.

any thoughts would be greatly appreciated

regards

Ozzy

PS: Yes I know I real telescope builder would probably make
his/her own mirror. But I'm just not setup or skilled enough
for that.
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