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Rod the 6" is as good for 'star surfing' as anything but the 8" Dob will give more detail in nebular and galaxy views due to the extra aperture.
Sure with a 6mm (recommended btw) you need to move the scope to keep planets/moon in the view cos they can disappear fairly quickly. This is really not a problem, all the OMG and Gasp factors still exist.
PLUS u wont get the Chromatic Aberration prob of red/blue halos around the brighter objects that Achromats produce if it's an Achromat you r talking about (altho reduced somewhat by the length of the scope u have opted for).
They r quick to set up and easy to transport and easy to use.
Trevor
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