SV220 dual band filter can reduce the light pollution; enhance the contrast when imaging nebulae
For deep sky photography; use the dual-band filter to enable deep-sky photography in light-polluted cities or under a full moon
Evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching;as well as stability on CWL (central wavelength) no deviation affected by temperature change
Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass band and Optical density of off-band
90% transmission of main nebula emission lines;such as Ha 656nm;OIII 496nm;500nm;SII672nm and H-beta 486nm
Description
This filter is a necessary component of any well stocked filter collection. With it, one can find both wonder and splendor in the darkness amid the paradox of the night and the logic of the light. Made of quality materials, lightweight, durable for years of use. SVBONY city light suppression broadband filter is designed to improve the visibility of various deep sky objects.