The SVBONY ultra high contrast filter UHC telescope filter is designed to improve the image contrast of nebulae and other deep-sky objects. UHC filters or light pollution reduction filters are designed to selectively reduce the transmission of certain wavelengths of light;especially those produced by artificial light. Due to its ability to produce exceptionally sharp and clear images;this filter is considered one of the most popular astronomy accessories; it can be used not only for celestial observations but also for astrophotography.