A very nice filter indeed. I don't have competing brands of uhc filters to compare with. In contrast to Deep Sky, Sky Glow and O-III filters this one does in fact have best performance with my smaller aperature scopes as advertised. Really takes care of light pollution from Yakima sky and neighborhood outdoor lighting. Lagoon Nebula was barely resolved without any filters. Installed this UHC filter in eyepiece and looked again. SHAZAAM! What a view!! I am happy with Astronomik UHC filters performance and would give a thumbs up to them for a very good product that does what they publish. Very dark sky background and planetaries really jump out with nice tight stars. A quality German product for sure. I will use this one quite a bit.