Even over a thousand dollars, telescope stuff generally doesn't attract import duties.
Ebay and Aliexpress charge GST on behalf of the Australian government. However, businesses overseas that don't have high volume sales to Australia are not required to charge GST for the Australian government. So if for example you were to buy a filter from say, Astronomik in Germany, no GST gets charged, nor will customs here hold the item and charge GST (or import duty).
If the item is worth $1000 or more, then Customs (Australian Border Force) will hold the item and charge you 10% GST. It's possible some $1000+ items slip through, but maybe best not to count on that.
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