SVBONY SV260 multi-bandpass filter is a 5-bandpass broadband pass light pollution filter. Equipped with OD4 cut-off depth and over 90% peak transmittance, the filter is designed to isolate 6-level light pollution and make light wave transmission maximum to enhance deep-sky details and improve the visibility of deep-sky objects. OD4 cut-off depth filters out the unnecessary light produced by artificial lighting including mercury vapor lamps, both high & low-pressure sodium vapor lights, and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). More than 90% peak transmittance reduces the light loss and delivers images of broadband-emitting objects, such as galaxies, reflection nebulae, and globular clusters, with minimal color cast. The SV260 filter effectively brings you a better shooting experience when starfield shooting and deep-sky photography. SVBONY SV555 professional astronomical photography lens is designed for deep-sky photography. Petzval objective lens structure includes a triplet lens and ED offering a clear image without aperture blocking. 44mm full frame has a wide field of view and provides a clearer image. EAF kit and fine adjustment make it convenient to shoot. F22 to F4.5 variable aperture meets different use needs. For photography users, SV555 will be a better choice to use.