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Baader's New 3.5nm Narrowband Enforced H-alpha Filters These three sizes of 3.5nm Enforced-Narrowband filters upen up the extremely narrow 3.5nm H-alpha world. This enforced contrast provides more signal of the faintest nebula detail. Manufacturing such ultra-narrow filters requires extreme coating homogeneity and very high Center Wavelenth Precision, which these filters have been designed for. The intial production has centered on the most important sizes: 2"/50.8mm Round, and 50x50 Square - other sizes to follow.