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Refractors per inch of aperture will out-perform a larger scmidt-cass or newtonian. No central obstruction gives better contrast, and no collimation to worry about.
I once owned a 6" Astro-Physics Starfire refractor, and it would show every bit of detail a C11 would show and with superior contrast.
Suggest you go along to an astronomy society and try to look through some different scopes before making a decision.
Sounds like you had a real dud with the Tasco-I agree that the tube rings may have been incorrect. Really, gems are pretty good and you will have far more scope for astrophotography in the future.
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