ZWONB7NMD36

ZWO-NB7NMD36

ZWO

This 36mm round ZWO Narrowband HA, SII, OIII Filter Set can help your observation and photography of spectacular emission nebulae. The filters passes hydrogen-alpha light at 656nm, sodium II at 672nm, and oxygen III at 500nm, resulting in photos with high contrast. The filters also reduce artificial light like streetlights and natural but unwanted light caused by neutral oxygen emission in the earth's atmosphere. Each filter is 2mm thick and 0.03nm.