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10" f4 Newt. focus problem.
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29-09-2015, 09:24 AM
Shiraz
(Ray)
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Join Date: Apr 2010
Location: ardrossan south australia
Posts: 4,918
when you do get it right, you may find that the secondary is too small after moving the primary up the tube. if you have not already come across it, NEWT is a useful design tool for checking this out.
https://stellafane.org/tm/newt-web/newt-web.html
Shiraz
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