SVBONY SV220 Light Pollution Filter Dual Narrowband Filter Telescope Filter Narrow Band Filter 6nm Filter for CMOS Astronomical Camera

7nm dual narrowband filter. is designed to significantly reduce the effects of light pollution. The high transmittance and sharp cutoff significantly improves contrast and provides the most detailed information when imaging emission nebulae, planetary nebulae, and supernova remnants. The 7nm bandwidth means a strong separation of the nebula's emission into H-alpha (red) and OIII (green-blue). You can enjoy deep space photography even in cities. You can enjoy deep sky photography anytime and anywhere, even in the city. The dual-band filter helps astronomy enthusiasts take deep sky photos in urban areas with severe light pollution or under a full moon. It is possible to lower the threshold for creating astronomical works. The use of dual-band filters can simplify post-processing for users and reduce tedious work. Compared to traditional monochrome deep space photography, there is no need for additional accessories or complex post-processing. The dual-band filter allows you to capture a large, full-color image with a single exposure. Ideal filter for use with DSLRs, One Shot Color (OSC), monochrome CCD and CMOS cameras, and astronomical telescopes with focal ratios of F5 or higher. 1.SV220 is an interference filter that transmits wavelengths around OIII (500.7nm) and Hα (656.3nm) and cuts other wavelengths. 2. Strong light pollution cutting effect, useful for high-contrast nebula photography such as narrowband photography. 3. Suitable for photographing emission nebulae, planetary nebulae, and supernova remnants. The narrow bandwidth makes the SV220 the perfect filter for astrophotography in areas with high light pollution, such as urban areas.