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Speaking of bigger mounts, I'm not sure if it is always plausible to assume that bigger aperture, even from the same manufacturer, will necessarily yield tighter stars given the same level of guiding is maintained with a heavier telescope. It is curious that for example Orion Optics states that for their fast Newtonians 12inch will yield the smallest spot size on and off axis, while their smallest 8" as well as their largest 16" Newtonians both have the largest spot sizes. Or is spot size unrelated to the FWHM we can expect in our images?
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