Spectral Curve.
The main emission lines of the fog: OIII (496 nm and 500 nm), H-beta (486 nm), NII (654 nm and 658 nm), H-alpha (656 nm), SII (672 nm).
The main emission lines of artificial light pollution: Na (589 nm), Hg (435 nm and 578 nm).
95% transmission of the main fog emission lines.
0.1% off-band transmission, especially the main emission lines of artificial light pollution.
The filter is designed to improve contrast and detail for visual and photographic purposes in places where light to moderate light pollution occurs like in cities.