UHC filter is perfect for observation of faint and low-contrast deep-sky objects, significantly reduces light pollution and increase contrast. This filter could cause a halo, if you turn down the exposure it does go away or weakens up enough not to notice.Gain new enlightenment into the night sky by making your darks darker and your blacks blacker. This filter is a necessary component of any well stocked filter collection. With it, one can find both wonder and splendor in the darkness amid the paradox of the night and the logic of the light.