No I don't use filters for my astrophotography. I don't know what sort of filter would help either. They sky in most of Australia is very dark as their is much less light pollution in the southern hemisphere.
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Ah. Here in Minnesota, we have some very dark areas too. Near the city, though, you can use filters that block certain wavelengths of light, effectively canceling out noise pollution. They're very expensive, though.
I wanted to get this one, until I saw the price tag: Night Filter on B&H
Oh ok. No I don't use anything like that.