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marc: If anything the tube wall is stiffer in the center than the edge.
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aha!
And I thought that maybe the frame at the end of the tube lends stability to the material - more so on the front. Cool, Marc
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because the light entering the scope is parallel so the obstruction stays the same.
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I just went and held my hand inside my 8" tube and the reflected image on the primary mirror appears larger the closer my hand gets. But looking through the focuser it seems to not change its size? Funny optics.
I think I'll draw a sketch to understand this better. Thank you