SVBONY SV220 2 Inches Dual-Band Filter

SVBONY 7nm dual band filter is designed to drastically reduce the effect of light pollution. The 7nm bandwidth means it strongly isolates
the nebulae's emissions into H-Alpha (red) and OIII (green-blue) from anything else. It blocks light pollution, maximizes the signal from 
nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high- and low-pressure sodium vapor 
lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere.

Dual Narrow Bandwidth H-Alpha/O-III 7nm Narrowband Filter Properly Designed For astrophotography of emission nebulae, planetary 
nebulae and supernova remnants. The high transmission and sharp cut-off greatly enhances the contrast of image and brings out the 
most detailed information of those deep-sky objects.  

The 7nm dual-band filter allows OIII (500.7nm) and H-Alpha (656.3nm) nebula emission lines to be highly transparent, strongly isolates 
the nebulae's emissions into H-Alpha (red) and OIII (green-blue), and drastically reduces the effect of light pollution.

You can enjoy the fun of nebula shooting at anytime and anywhere in light pollution city or under a full moon. You don't have to to travel 
through mountains and rivers for your photography, and your traffic fuel and time are also saved.