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Protector

Many photographers use a UV filter as means of protection in front of their expensive lenses, when a true protector would be a better choice. Surely a high quality UV filter will do the protective job, especially when it is of the Hoya HD kind. But many filters of other brands are no UV filters. They often do filter out colors of the spectrum (except for the UV range sometimes), so they induce a color haze. And quite some of them also show a bad transmission. Just think of it: you buy a very expensive lens with a stunning transmission (apertures up to f/1.4 and then you screw a filter on that stops 10 to 15% of the light. You'd be disqualifying your lens that way.
We advise: use a dedicated protection filter, a true protector, when your sole intention is to protect your lens.

No filter

Because that is what a protector is: it is no filter. It does not filter any light. It does not do anything with the light. Well, near to nothing. Hoya's HD protector shows zero colorization, is completely neutral and allow's 99,4% of the light to pass through. So it is made of the best optical glass and double sided polished. Its resolution, the ability to reproduce the smalles details apart from one another, is equally high. It doesn't filter anything, it just protects.