Very good Polarizer

After much research I have struggled through to purchase this polarizing filter. The decisive factors were the one hand, the numerous good reviews, as well as the favorable price.
As Hoya offers two variants of the polarizing filter, I chose because of the allegedly higher light transmittance and, as it obviously is the newer product, for the HD version.
The filter was shipped in a standard plastic bag, be shipped to the apparently all filters of various diameters ... not really nice and also not very practical, but the packaging serves its purpose.
First, I want to mention that I'm using the polarizing filter with my Nikkor 18-105. The thread I accurately processed and settled both attach easily, and remove. The condition is that you do not overtighten palmed. Due to the slim version of the knurled screws for is really very thin. But with a little feeling there is no problem. The filter can be for the pole-effect simply twisting and sliding bearings between the two disks running properly like clockwork. Even the original lens cap, as well as the sun visor can be used properly. With a bit of tact and not too thick fingers can twist even with a patch panel nor the pole-glass.
The effect of polarization is clearly noticeable. The blue of the sky and the green of the plants affects richer and darker. Clouds stand out dramatically and plastic from the background. Also, the reflectance-reducing effect, which I have tried in my patio door, is working properly.
In the shortest focal length of 18mm (27mm KB) I could not notice any appreciable vignetting as a hobby photographer. Unwanted reflections were of course due to the possibility the sun visor to use a non-issue. Color casts or market changes, I have not noticed.
As I said, I'm only an amateur photographer with a little knowledge in photo editing and for this purpose this filter is in terms of the price / performance ratio unbeatable.