spectral curve
The main emission lines of fog: H-ß486.1nm OIII 495.9nm OIII 500.7nm H-α656.3nm
The main emission lines of artificial light pollution: Hg 435.8nm 546.1nm 577nm 578.1nm
Na 598nm 589.6nm 615.4nm 616.1nm
--95% transmission of the main emission lines of the fog and 0.1% transmission of the off-band, especially the main emission lines of artificial light pollution; ideal for observing in cities and suburban areas