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I use my OIII filter primarily to view and confirm Planetary Nebs, use a regular Neb filter for other nebs. Main use is to confirm PNs, it dims everything else but the PN stays bright, that confirms what I am looking at then mostly examine at high mag without any filter.
Very useful filter!
Last edited by barx1963; 25-01-2010 at 10:19 PM.
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