Astronomik
Astronomik CCD and visual interference filters are produced in Germany using high-quality manufacturing standards and mathematical precision. The coatings on all of these filters, including Oxygen III (OIII), H-Beta, H-Alpha, UHC, SII, IR-Cutoff, CLS, and RGB, are amazingly hard. They are almost impossible to scratch, and are completely sealed and insensitive to moisture. Because of these outstanding characteristics, Astronomik offers a 5-year warranty on all of their filters.
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