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Improved visual solar observing
You're 100% right about Ha observing; to see surface granulations and proms you need either a PST or one of the Solarmax (sm40/60 plus blocking filter).
If you'd asked me a year ago - does a secondary Ha filter imrpove the visible surface detail I would have said no, but recently I've seen some excellent images which show significant surface detail when a narrowband Ha filter is used in conjunction with a front aperture solar filter ( Baader/ Sola screen etc) It seems to definately increase the contrast.....
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