Another finely crafted filter from Hoya, one of the most well established manufacturers of these items on the market.
The Pro1 polarising filter fits tight'n'clean directly onto the lens or onto another filter - I have UV daylight Hoyas permanently fitted to my 18-55mm and 55-200mm lenses, both to do what they supposed to do, and to protect the front elements of the lenses themselves.
Happy about the 55-200mm, because the elements don't turn externally when zooming or focussing, but the front element of the 18-55mm Nikkor does to focus, and has very little resistance when in manual mode, so I was concerned that getting the desired effect by turning the two-element Hoya polariser would make a mess of an otherwise carefully framed and focussed shot.
Not so: although the filter has some friction built in for holding its setting, its precision means it turns smoothly with fractionally less resistance than the lens ring, and the two work well together, although a practised touch will be needed, at least on my setup.
As it only arrived today - a mere few days after placing my order: well done, Amazon and Camera King - I haven't had time to get back properly into using this type of filter, but there are plenty of rivers, canals and other opportunities nearby to see what it can do. A similar (Hoya) version worked well with my old 35mm SLR.
This version isn't cheap, but you get what you pay for. Because of the sheer quality of manufacture, slim profile and almost addictive, tactile precision, it has to merit a five star score.
Another note:...and the 67mm version recently purchased for my new 18-105mm Nikkor is just as good. Nice crisp action - the 18-105's focus ring only telescopes to achieve focus, rather than rotates as well, but again, the minimal friction of the polariser is a delight to use. Another 5-star vote for the Hoya.