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University optics cell

Started by Mark Shelton, 01/27/2011 06:32PM
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Posted 01/27/2011 06:32PM Opening Post
Mark Shelton
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Join Date: Feb 2007

Location: Riverton UT, US

Posts: 2

Hi,
does anyone have experience with University optics 13.1 Cell. I am thinking about getting one to make a new Dob. I have an old coulter mirror.

Mark
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Posted 01/27/2011 10:54PM #1
John Holt
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Join Date: May 2003

Location: Grand Rapids MI, US

Posts: 252

Mark Shelton said:

Hi,
does anyone have experience with University optics 13.1 Cell. I am thinking about getting one to make a new Dob. I have an old coulter mirror.

Mark

It is my experience that their 9 point cell with the support points in three rows of three, radially down the spokes of the mirror cell, will not support a 1" thick 13.1" mirror properly. This configuration of support points is wrong for this thin of a mirror, and yields astigmatism.
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