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John,
I have had this review for several months but could not release any information on it as it had not previously gone to print. Phil rated the Baader UHC-S as inferior to the Astronomics UHC, Lumicon UHC, Orion Ultrablock, Televue Narrowband, Meade Narrowband and he rated the DGM Optics NPB filter is the best narrowband filter of all and it is quite inexpensive. I suggest you read a copy of the review prior to dropping your hard earned, particularly if visual astronomy is the main intended purpose.
CS-John B
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