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It's basically a green filter which passes a narrower range of wavelengths than a normal green eyepiece filter. I can see it making a difference with an achromat or semi-apo refractor, but if you're using the reflector in your signature it's probably not worth spending money on. You could try an ordinary green eyepiece filter - I find the image too bright in 4" scopes and the green filter tones it down a bit.
If you decide to buy the continuum filter Andrews has it for $114.
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