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Not precisely relative to your filter question John but I've bought quite a lot from Aliexpress including 2 ball head mounts and one gear head and not had any problems and a lot of electronics.
I did buy a set of maybe polarised filters for different stages of the moon from SVBony and they are very good for the money, plus oIII from Aliexpress from memory (or some other thing) and it too is good.
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