I would not buy a telescope from Aust. Geo. They do not have a clue about scopes. This one looks very much like the cheapies you see on ebay: flimsy mount and tripod, poor finder, focuser, accessories. And if it really comes with a Sun filter, it's almost certainly a screw-into-eyepiece type, which is a real worry! If you want this style of EQ mounted scope you should consider a GS or Synta 8" f/4 on an EQ5 mount from Bintel/Andrews/AOE/Myastroshop...
Re Dob vs this style scope, an 8" f/6 Dob will almost certainly outperform an 8" f/4 Newt, because it's easier to figure a slower mirror and central obstruction will be smaller.
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Originally Posted by iceman
... but I would think the 8" dob is much better value for money, and at f/5, much easier to use.
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Mike, the 8" GSO/Synta Dobs are f/6, so even more forgiving.