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As a visual filter I think it is very good and I enjoy using this on my diagonal for general viewing. I think it may help reduce light pollution slightly. I too have a NA140 vixen refractor. The filter doesn't correct enough for photographic. A UHCS or contrast booster eliminates more violet fringing but gives more colour cast for visual (ie contrast booster). That said I don't find the contrast booster too objectionable with its cast. The semi-apo adds nice contrast to Mars and planets like Jupiter, although as yet my NA140 hasn't lived up as well in the planetary space and probably needs more severe filtering. I'm yet to try the Baader 495 discussed above and am waiting to see how the contrast booster goes on Jupiter. Keep in mind my scope is f5.8 I think that in a f10 the semi apo may be enough.
Regards
David
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