Well, it depends on what you are imaging. If nebula's are what you are targeting you can do narrow band imaging. With the way it works you could do imaging from the steps of the Sydney Opera House.
Otherwise you're going to need a dark sky. You can image well enough from places like Linden or better Katoomba airfield if you image away from the Sydney light dome. I imagine the pony club is good too. These are far closer than 4 hours away.
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