Have the filter bought mainly as a lens protector. It fulfills this purpose. The build quality is ok - it can be screwed normal and screw down again - the processing has a neat appearance. However, but visual impairments are present, which I also as a professional not find so disturbing that the filter for snapping comes down. I also have other (admittedly more expensive filters), where me is not so extremely conspicuous. Maybe I caught only a bad copy? I'll keep it anyway, because as I said it screw him just as a refuge for one of my lenses.