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Hi Molly..
I bought these Colour Filters about 5 years ago, at that stage they were $40.00 each. (12) all up...The Hydrogen Alpha was around $130 to $150 can't quite remember, had this for 1 year...Hydrogen Beta was around the same price i think, i have had this for around 6 months. all filters are in excellent condition. Please remember that all of these filters have threds on "both" sides, good for stacking on to each other. lloydysun....
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