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Hi Henri,
It kind of breaks down like this:
In the perfect world, everyone would own refractors. Problem is, they cost a bundle, especially in bigger apertures. Plus, a 6" refractor is about 5 feet long!
Reflectors are the cheapest, but again when you get big aperture, you also get a physically long tube.
Cassegrains are the good "in between" compromise, where you get big aperture in a physically short tube, that still has a long focal length.
Clear skies,
Shane
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