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Well, 150mm isn't *that* small, you will get improvement on nebulae, probably moreso on brighter objects. I've used a Meade Narrowband in my 4.5" scope and loved it.
Your best bet though would be to go to a club star party / viewing night and ask people if you could try their filters in your scope and then decide whether or not to reach for the wallet.
the Mornington Peninsula astro society has public observing sessions down at 'The Briars' on the first friday of each month I think it is.
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