Also I want to emphasize that and can only recommend this filter! The build quality is very, very good! Visual impairment or loss of sharpness I can not see ... the supplied transport box is of the highest quality, but the filter has been supplied with a light layer of dust. With a microfiber cloth to the filter is however absolutely no problem spotlessly clean.
The only thing I do not think so beautiful, that the original lens cap my Canon is no longer fit without play on the filter, because the thread of the outside seems a little shorter ... although that's whining at a high level, but a bit disturb it hold me already.
My next HOYA filter for another lens is in any case already ordered ... I think, even if you "only" provides the filter for lens protection, it is worth it for the optical quality but a few euros to take into their own hands.