I am selling selected items from my late Dads Astro telescope/ photographycollection.This is completely unused Grab yourself a bargain BRAND NEW AND UNOPENED 1¼” Baader H-Beta CCD-filter 8,5nm with 1¼” (28,5mm) filter threadFor focal ratios between f10 and f2.8H-Beta-CCD-narrowband-filters can also be used for visual observations! (A high-quality alternative to the old Lumicon-H-Beta-Filters)Anti reflection coating, fineoptically polished
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