[Pre Order - allow extra time] Alpine Astronomical Baader S-II Narrowband Filter (2" Eyepiece Filter Filter) 6.5nm 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 S-II Narrowband Filter (2" Eyepiece Filter Filter) 6.5nm FWHM, Ideal from f/10 to f/3.5, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges