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Originally Posted by janoskiss
As I do own both scopes I can say with absolute certainty that in good seeing the 12" blows away the 8" on planets
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I witnessed this myself at Snake Valley last year. I observed Mars through 8,10, and 12inch gso dobs with each size increase came an increase in observable detail.
As for the original question, there is no substitute for dark skies for dso viewing. In dark skies I can easily see galaxies and low surface brightness nebula like the helix in my finderscope, where I cannot see them from my backyard with 10 inches of aperture.