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Collimating a NA140

Started by Peter Glus, 01/17/2009 04:00PM
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Posted 01/17/2009 04:00PM Opening Post
Peter Glus
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Join Date: Feb 2006

Location: Flushing NY, US

Posts: 183

I have a original-type NA140 and I am all of a sudden noticing astigmatism in the EP. I made sure it wasnt the diagonal. Although it is strange that this "appeared" (maybe I didnt notice it!), I was planning on rotating the lens cell on its threads and the read elements to see if it works. Any advice before I get going on this?
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Posted 01/21/2009 02:36AM #1
Danny Vettoretti
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Join Date: Jan 2004

Location: Sudbury ON, CA

Posts: 92

Could you be using it especially cold weather causing issues with the lens cell?
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