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I often use my 12" Newtonian to observe the sun.
I use 2 layers of mylar as a filter.
When I used the cap hole with the mylar the result was less than satisfactory. So I made another cover with a 4" inch hole covered with the mylar and found this to produce excellent results.
I have observed the sun for at least an hour with no heating or problems with any components.
Hope this helps.
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