ZWSII7NMD2

SII7NMD2

ZWO

This 2" ZWO 7nm Narrowband S-II Filter can help your observation and photography of spectacular emission nebulae. The filter passes ionized sulfur light at 672nm, resulting in photos with high contrast. The filter also reduces artificial light like streetlights and natural but unwanted light caused by neutral oxygen emission in the earth's atmosphere. The filter's cell is 5mm thick plus 2.5mm of M48 x 0.75 male thread. The glass filter itself is 1.85mm thick.