This Astronomik SII CCD Filter 6nm is suitable for photographing SII regions from artificially polluted areas as well as places with dark skies. The contrasts between objects that glow in the light of the sulfur line at 672nm and the sky background are greatly enhanced.
The 6nm SII-CCD filter dramatically increases the contrast between hydrogen fog and the sky background.
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This product has multiple variants. The options may be chosen on the product page