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Hi, 

Just thought I'd share this in case you haven't seen it already. A recent (September 2020) article added to the Celestron 'Knowledge Base' on collimating SCTs.

I don't claim to have seen all articles on collimation, but this is defs one of the best that I have seen. 

https://www.celestron.com/blogs/knowledgebase/sct-edgehd-collimation-guide

 

Siouxsie 

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