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Hi Luke,
The Celestron filter looks a bit cheap IMO. SkyWatcher and Saxon make some better filters from metal, rather than plastic. I thought there were more Telescope shops in Perth. All I can see at the moment is the Australian Geographic stores.
Barlows can be useful but make sure you buy one that is multi-coated or preferably fully multi-coated. You would be able to use one with any eyepiece down to 15mm, or maybe 12mm, but you couldn't use it with a 10mm or smaller as the magnification would be too high.
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