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I recently purchased a 2" DGM Optics NPB filter for use with my C11 and 41mm Panoptic, and at this stage I am very impressed. I have only had limited time with it, but for example, Tarantula takes on a 3D appearance and is almost photo like. I cannot wait to see M42 with the filter in place!
Not sure how the others compare, but looking at a couple of reviews on Cloudy Nights, it seems the two to have is the DGM NPB and the Lumicon OIII.
Hope this helps,
Cheers,
Daniel
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