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For visual viewing, IMO 4" is the Goldilocks size: Its not too big, its not too small. In an ideal world, every stargazer will have a quality 4" refactor.
Its strange in a way, because larger scopes may cost more, but are often used less (except perhaps the first month.)
I use my smaller refactors (80 to 100mm) most days, even pushing my luck on unsuitable nights, especially with the 81mm. In contrast, my 8" SCT is used only a handful of nights each year.
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