Hi Simon, welcome to IIS! I would not recommend filters for your scope. They offer little if anything in way of improvements to the view and cost a lot. IMO Nebula filters are only really effective on larger scopes 10-12" or bigger. They are very impressive on BIG scopes 18" and larger, but rob too much light from smaller scopes. I have a number of filters, coloured ones, DGM NBP nebula, neutral density, crossed polariser, and almost never use them.
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