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You can get an 8" F6 Dobsonian from a Sydney supplier for $399. they are pretty compact - when i used one I at first thought it was a 6" due to its size. Use it in Sydney and take it camping . Try both places and put an off axis 100mm cardboard stop over the aperture to compare views , and then decide whether it would make much sense to have $3000 invested in a that kind of aperture A 32mm 2" ep will allow you to get down to X38 which gives you a few degrees of sky. At least you will learn a lot for a little outlay. You will see next to nothing exciting in Sydney skies with a 4" telescope but the Moon and planets.
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