[Pre Order - allow extra time] Alpine Astronomical Baader H-beta Narrowband Filter (1.25" Eyepiece Filter) 5.5nm FWHM, Ideal from f/10 to f/3.5, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges
[Pre Order - allow extra time] Alpine Astronomical Baader H-beta Narrowband Filter (1.25" Eyepiece Filter) 5.5nm FWHM, Ideal from f/10 to f/3.5, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges