In principle the thing does the job. However bothers me that you can not attach the lens cap when the lens hood is mounted (at least not at the Panasonic 20mm / F1.7). I have dozens of lenses along with lens hoods owned in my life, but this is the first one in which you can attach the lens cap when not installed yet when flipped mounted lens hood. Some one has indeed the lens hood with a bayonet or clamping vice versa set up to attach the cover, but even that does not go with this. With the Lens Cap the thing flying around loose in your pocket. Absolute botch - if the return is not nearly as expensive as the article would be, would that thing back!