Ingrandisci Codice articolo: 8H00NV
The Astronomik [S II] filter is a super-narrow band filter for astro photography. The filter lets only the light of the single ionized sulfur ([S II]) pass.
![The Astronomik [S II] filter is a super-narrow band filter for astro photography. The filter lets only the light of the single ionized sulfur ([S II]) pass. [EN]](https://www.teleskop-express.it/img/cms/astronomik-8h00nv-sii-6nm-ccd-31-mm-rund-1000.jpg "The Astronomik [S II] filter is a super-narrow band filter for astro photography. The filter lets only the light of the single ionized sulfur ([S II]) pass. [EN]")
♦ 97% transmission of the [S II] line
♦ 90 % guaranteed transmission at 672 nm [[S II] line]
♦ 96 % typical transmission at 672 nm [[S II] line]
♦ FWHM 6 nm
♦ Blocks UV and IR completely, necessary for digital photography
♦ Main operational use: planetary nebulae & supernova remnants
♦ Parfocal with other Astronomik filters
♦ No moisture-sensitivity, no aging, and totally scratch-proof
♦ Substrate optically polished
♦ 10 years warranty by manufacturer
♦ Connection: round filter 31 mm, unmounted, protective ring
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