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i think the biggest problem youll have is getting the benefit of a narrowband filter with 70mm aperature- even though the filters dim everything they do make the neb stand out slightly more- but i think they work best with 8" aperature or better- if LP is the problem, i never seen a real LP filter myself- although the baader NEO does a pretty good job of increasing constrast in LP skies, also this filter does a great job in bringing out planetary constrast- john
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