I am comparing this to the Bower digital PL. It is 1/2 the thickness and is easier to use as the turning part has ridges spaced around it so you get a good grip and can control the amount of polarizing. I tested it today and it looks to be completely color neutral and no color fringing like I have seen in others. Price is right and I can highly recommend it.

Everyone who shoots outside needs a polarizing filter in their bag. The build quality and optics on this one seem excellent so far, and the overall feel is comparable to that of a more expensive filter. Rotation is smooth and natural, and the 77mm fit perfectly on my Canon RF lens.

This one is better on overcast days.
I have several of K&F’s polarizing filters. I find they have made me a better photographer.
Recently it snowed. I wanted to take photos of the pristine snow. The sun came out and the glare was reflecting off the snow. This filter toned down the glare and produced much better shots.
I now never set out for the day without this filter and my black K&F filter.

Sizing was correct and threads allowed easy install. sturdy construction.

A product that looks great in construction, nice sharp lens and CPL working great.
The slim construction then does not make the filter look mounted. Great!

Maybe it's a bit expensive, there are even cheaper ones, I trusted the positive reviews, I used it for landscapes with cloudy skies and you notice the difference in the photos, it's a very useful filter that you always need have for landscaping and with post-production you do not replace it.excellent recommended filter

What I liked the most is the low loss of illumination and the great effectiveness of polarization “remember 45 degrees from the sun”. And the least of all is that it is too hard to turn or used to others, I imagine with the use the turn will become smoother.

This is the first lens filter I’ve ever used. I’ve always read/heard that a good filter can make a significant difference, but I never ended up getting one until now. This polarizing filter is very nice! It’s easy to see the quality construction of glass and metal. In my pictures, you can see that the filter is attached to my camera, but I was also able to attach my lens hood directly to the front of the filter. It has front receiving threads in addition to the rear threads. A really nice feature is that the front of this filter freely rotates. This now allows me to easily rotate the tulip hood to the best position without any risk of the filter or hood loosening. I couldn’t do this when the hood was connected directly to the camera. Does the filter make any difference though? I’m pleased to say that it works very well! I often take pictures through a window, and it's very common for the picture to have a certain “haze” to them that wasn’t there if I took the same picture outside. I took a picture through the window with this filter in place, and I was pleasantly surprised to see a picture that looked like I had taken it outside. I don’t know exactly how this works, but it does. Just like polarized sunglasses, this filter “controls” the light in a way that improves what you see. I’m impressed!

These are well made filters, the ring is very small so they won't cause any vignetting even on fairly wide angle lenses. These threaded onto my lens smoothly and stayed on securely. These circular polarizers reduce the light only a little, and once they are screwed on there is an outer ring that lets you rotate the polarizer to get the best effect.

You can use these to reduce reflections from things like water, glasses and windows. Because it reduces reflections, you can see down into water making it look clearer and cleaner. It also helps deliver a clearer sky image when taking photos outside.

This is the "D" series filter, they also have a "K" series. I'm not sure the exact difference between the two as K&F's own website doesn't really explain it. As near as I can tell the "D" series ones (this one) are a slightly more expensive design with more layers of coating, including water/oil repellant coatings on both sides. They describe these as "waterproof".

Worked well with my ND filter.