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Hi,
I had exactly this issue with my 8" F4 newt. I could never get things spot on until I used an adapted version of the procedure Vixen suggests for positioning and collimation of the secondary in an R200ss.
After using this procedure I was able to use Catseye tools to collimate perfectly - this was more accurate than a sight tube. For the first time I got a perfect star test, and perfect images over an APSC chip. Blew me away when I finally got it right.
PDF attached
Hope it helps
Gary
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