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Joined: Mon Oct 12, 2009 8:27 pm Posts: 370 Location: Adlington
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Ross, These should be approximately the same scale. I used a bandwidth of 6 and 7. The wider ones are really for wide-angle lenses. When you go narrower than 6 then you lose out on NII emission which is very close. The filter should be referred to as an h-alpha + (NII) and I think Phil's images actually quoted that. Narrower than 6 starts to get seriously expensive rather than just plain expensive.
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