SV226 filter drawer adopts integrated CNC molding and anti-light leaking design. It can compatible with 1.25"&2" specifications filters on the market. Strong magnetic attraction, prevent the filter from falling off. Advanced CNC integrated molding processing, strong and sturdy. SVBONY SV220 7nm SII&OIII dual narrowband filter is engineered for astrophotography, allows One-Shot Color cameras to capture rich, detailed narrowband images in a single exposure, without the need for combining multiple filters. High transmission and sharp cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects. Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.