Fast delivery, typical CPL packaging in a plastic box, nothing special until then.

Very good anti-reflective coating without loss of sharpness with the CPL 55mm diameter D-series. I've always lacked that little bit of sharpness, even that was remedied by, among other things, more contrasting images.
The picture uploaded here shows in 100% Cropp left without filter and right with filter, I was talking about the sharpness image, taken with Sony a7ii and kit lens on 65mm with 1/100 f5.6 ISO 800.
The second picture shows left without reflection and right with reflection.
I don't want to test whether it is scratch-resistant.

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".

In any case, well made filters that do the job.

I acquired this 82mm Circular adjusting Polarizer Filter for use on both my Sigme 24-70 f/2.8 E mount as well as my Canon 24-70 f/2.8L II lenses. It's simply a perfect polarizer for these highly versatile zooms.

The lens is extremely well-made and circular action is smooth as silk when attached to the lens. High-level multi-coating assures detail in photos and videos without artifacts or hazing, and maintains outstanding focus accuracy.

Polarizing filters have multiple uses, including deepening color enhancements of sky and landscapes, especially in bright conditions. Additionally, the circular adjustments can be used to shoot through windows clearly without reflection, as well as taking pictures or video through water. For example, this filter can be used to take perfect pictures of Koi (Japanese Colorful Carp) in a pond without having light bounce-back from the water surface. There are other uses as well.

To operate, it only takes pointing a camera at the subject and turning the outer level of the filter until the desired effect is seen through the viewfinder...or on a display screen. Easy peasy.

I own a number of K&F filters of different types including UV, ND and Diffusers. I have come to trust the company's products. This one is a superb value at the price as compared to much more expensive Polarizer filters like those from B+W and Hoya, while providing virtually equivalent performance. Awesome!

It's an unequivocal high FIVE STARS from me, along with my honest and very hearty recommendation. Up your photography and vlogging! Get this!

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I just came back from vacation where I used this CP frequently since we were at the beach and near water all the time. Previously I got another K&F UV/protection filter and was impressed by the quality, so I decided to get this CP filter as well before our trip. It arrived just in time and just like another one I have - it is definitely a great value for the quality you are getting. Usually I shop used market for photo accessories and good quality CP filters of this size (B+W, etc.) cost more sometimes, unless you are lucky to get one in new condition in this price range. This filter seems to be very well made, good quality glass and coating, and I did not notice any artifacts while pixel-peeping on my Sony 7R III using Tamron 28-75mm f2.8 lens with this filter. Definitely recommend checking out this CPL if you are in the market.

I do mostly landscape and "street" photography. I don't use a lot of filters, but I sometimes use neutral density (ND) and graduated neutral density filters for special situation.

However, I often use a polarizer in bright sunlight. It can help tame unwanted reflections, and it is particularly useful for increasing saturation and contrast in skies.

This filter threads smoothly onto my 77mm Nikon SLR lenses. The outer filter ring rotates smoothly. (You need to orient the filter to get the best results.)

Like any polarizer I've used, this one reduces the light reaching the camera sensor. This one reduces incoming light by about a stop-and-a-half.

Mechanical and optical quality are good as far as I can discern.

This vendor offers wide variety of filters. Pricing seems very reasonable

I ordered this polarizing filter for use on my Sigma 30 mm F1.4 DC DN Contemporary lens (my prime lens, not included); polarizing filters eliminate non-metallic reflections, thus enhancing scene detail and contrast. This is a superior quality polarizing filter whose polarizing action is easily verified by rotation while viewing an LCD monitor through the filter. The filter incorporates multiple coatings to prevent distracting optical reflections appearing within photographs. The filter machining is excellent: the threads attach cleanly; the filter rotates smoothly when lens-mounted. And the foam-lined filter plastic sturdy container effectively protects the filter while it sits in a camera bag.

The filter is very well packaged and makes a high-quality impression. I've only been able to test it so far. It is easy to screw onto the lens and is easy to operate.

I really love K&F concept's filters - they just work... every time. This CPL is both affordable and made with great quality glass. There's no vignetting on my 18-140mm lens. And most importantly there's no color shift like you get with other CPL filters. The threads match up with my camera's lens, and the adjustment ring provides just enough resistance to make adjustments smooth and convenient. This is an excellent polarizer, you won't regret this purchase.

I still shoot landscapes with a DSLR, and one of the 5 filters I use most often is a circular polarizer (CPL) because it helps to filter out the scattered light rays that cause glare on water, windows, and wet leaves, and that wash out the sky's normal blue tint.

There's not really a lot to say about a filter, though--does it do its job? Yes.
Does it do its job well? Yes.
Does it do its job well enough to be worth the purchase price? Absolutely yes--selling one or two prints taken with this filter will cover its purchase cost in profit.
Does it make it easy to take landscape shots that will sell? Skill plays a large part in that, but this filter does help to limit a few sources of the glare that can (not always) ruin landscape shots. It's also good in light tents and other situations where you have multiple strong light sources from different directions.

It's multi-coated glass, so they've paid pretty careful attention to limiting how much light this filter allows to bounce around, and to making it pretty much point-and-shoot once it's installed on your lens, even if you're still using the green box (full-auto mode) on your camera. This is my 4th CPL filter in different lens diameters; I've never had one be so great or so bad that I had strong feelings about it either way.

I have other K&F's and they have served well. Picked this up to go on my nifty 50, a "required" lens for the "serious". I use it on occasion, but not the best for birds and other wildlife. I expect it will help in the bright sun for flowers and such, but this time of year there is neither.

I was fortunate enough to have had the foresight to have a polarizer on my lens when photographing the geysers at Yellowstone NP. The difference was stunning. Since then I have always done my best to have a CPL for each lens, or at least one that could use a suitable adapter.

The quality is sufficient for an occasional use lens, and the price is right for such. Recommended.