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Well, theres other problems with NB. The filters aint cheap (possibly more than an ED80 ;-), and you need a camera that has the frequency response. A cheapy unmodified DSRL wont do. Also, much longer exposures are required than RGB, which means hand guiding, although not impossible, will be mighty tiresome. What cam are you planning to use?, why are you so keen on NB?. An ED80 would do the job I think. I dont know what imaging experience you have, but if not much, youd be well advised to try RGB 1st.
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