1.25” telescope filter is a multi-band pass filter transmitting a high percentage of light in the visual spectrum; the filter enhances contrast when observing brighter objects including the moon and planets. Suppresses skyglow from artificial lighting and background glow reflected from moonrise. 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.