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An SM40/BF5 or a SM60/BF10 front etalon filter would work well on the Genesis.
I have the SM60, but mount it on the ED80 with a DMK41 camera for solar imaging.
Remember that it is possible to modify the PST to use a larger aperture telescope ie 80mm -200mm - Costs money.... but a very, very safe and effective way of getting fantastic Ha views/images at reasonable cost.
(I have a write-up available on Modding PST scopes (6Mb) - PM your email address for a copy)
Ken
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