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With aperture masks are they only of use with large reflectors or could I make one for a 5" Mak Cas? I'm assuming rather than making an off axis hole you would just create a donut like mask?
I might have a go at this for moon viewing as I was blinded by the glare last time. I'd rather not get a filter as I'd have to get a 2" and a 1.25". Unless there is a way of putting a filter on the diagonal?
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