Aunque tengo un filtro de esta misma marca que hace su función correctamente, no permite modificar la luz y el contraste. Este filtro sí lo permite, aunque sutilmente, permite girar suavemente la lente una vez acoplado y modificar en luz, contraste y color la percepción de la imagen. No es un cambio con mucha variación, pero permite retocar levemente la intensidad con que se capta una imagen.
Se le podía poner un punto negativo por el precio, pero, en mi opinión, es una valoración personal y relativa.
La calidad es muy buena y cumple perfectamente su cometido.

If you're used to cheap $10 filters just to protect your lens the price is eye watering for sure.

But this is a quality filter from top to bottom. I normally ignore packaging aesthetics but thats the first thing that stood out. I thought there was a watch inside. From box to the filter pouch - Quality. They even threw in a cleaning cloth. Normally youre on your own with that.

As for thr filter itself, doing a side by side with my cheap filters there a noticrable difference in detail. The filter itself is textured and grooved to reduce need for a filter wrench. The glass even spins inside of the ring so you dont overtighten. The 67 thread covers a wide range of lenses I have but Ill be using this for landscapes. One small knock on this is that theres not much depth to the filter so my lens cap doesnt securely settle in and ultimatley can bump off.

Still one of the best filters out there.

I started photography back in the film days, when digital post processing was not an option. Consequently, filters were a must. I have always had circular polarizers available for all of my landscape and outdoor work
glass. The K & F Concepts CP is relatively expensive, but why buy high end lenses and skimp on the filters?
The packaging and presentation is befitting the high quality glass enclosed. This filter is simply the best quality polarizer I have used to date. I highly recommend this item, it is worth the price, and you will not be disappointed.

Transparency notice:
The product was made available to me free of charge as an evaluation sample, free of any influence or expectations. My review is based solely on my personal assessment and experience of using the product.

Review:
For quick readers, I'll preface my review, below I'll explain the details of my decision making, my impressions of the product.

I only make a minimal deduction of points and award 5 stars, i.e. 5 stars rounded up.

My only criticism is that the filter rotates slightly too slowly, i.e. its operation when it is screwed onto the lens, but I hope that will subside a bit over time. No, the turn isn't slow, but it's a bit tough, I expect a slightly smoother movement here.

Workmanship:
The slim frame is of very good quality, precisely processed and painted. I like slim filters, they build up less high on the lens and therefore do not limit its viewing angle, especially with a strong wide angle.

Slim filters can have the disadvantage of being more difficult to handle, as the grip ring is very thin. It is helpful here if it is handy and that is exactly what the K&F filter is.

I can grasp the filter very well and see no problem even with wet fingers.

The glass in the filter is of very high quality, optical glass, very precisely processed and absolutely flat, and has also been coated several times.

First, pick up the filter and look through it, preferably against strong contrasts and straight lines, such as a façade.

Here you can see that you don't see any glitches. I don't notice any distortion, the image is absolutely flat, over the entire surface of the filter, and I don't see any color distortions, I'm very satisfied.

It looks no different when I screw the filter onto my lens, but here is another aspect, possible reflections, but that is exactly what a polarization filter is supposed to eliminate.

In terms of image effect, this is absolutely undisputed, whether on a water surface or on windows, reflections are suppressed very well, as expected. But there is another aspect and that is the reflections on and behind the filter towards the lens when backlight comes in at an acute angle due to small punctual light sources. I don't see any reflections here, which speaks for the very good coating and glass quality of the filter.

I am very pleasantly surprised by the packaging of the filter and that starts with the attractive outer packaging in a high-quality slipcase.

It contains a flip case with magnetic closure, it is very decorative and practical, much higher quality and more elegant than the commonly used plastic boxes.

Conclusion: The K&F polarizing filter is not
a bargain at just under €150, but it is inexpensive in the sense of the word and is clearly placed in the premium segment. The processing quality itself is just as impeccable as the optical imaging performance on the lens. The included case is very attractive.

Only the somewhat slow adjustment of the orientation minimally disturbs the overall impression, so I subtract half a star for this. In the overall impression, this only plays a subordinate role and leads me to an almost unrestricted purchase recommendation.

Thank you so much for your attention when reading my review. If you'd like, feel free to give me some feedback, I'd be happy to hear from you.

I recently purchased the K&F Concept 67mm Circular Polarizers Filter Super Slim with 36 Multi-Layer Coatings and I'm so impressed. It's amazing how much of a difference this filter makes to my photos - in terms of clarity, sharpness and colour vibrancy. It's super slim, yet incredibly strong and durable. I love the 36 multi-layer coatings which give me amazing results every time. The images are crystal clear, thanks to the high definition coating. The colors come out vibrant and the polarizing effects are stunning.

Got this to improve the image quality when I am out and about in the evenings taking pictures by the coast here in Newport Beach, CA. The filter was really easy to install onto my Canon EF 70-200 2.8 L lens, and it is very easy to maintain. The pictures came out stunning, especially from the water. I am in love with this lens filter, which is my new daily driver. Worth.

I've been a fan of K&F Concept for a long time and have a lot of filters. Especially in the beginning, the cheap products were a real boon for my wallet. I simply couldn't afford expensive polarizing filters, ND filters, or adapters. However, they impressively demonstrate that K&F Concept can also be absolutely high-quality with this filter series.

I can report that just unpacking the filters is a real pleasure. Although this doesn't count directly into the review, it immediately gives off a completely different feeling than with the brand's other product series. It continues with a very attractive and haptically convincing case, which allows the filter to be removed via a tab.

But now on to the filter itself. I already have several polarizing filters in use, but none of these filters really convinced me as much as the Nano-X PRO. The workmanship is simply excellent, the weight is comfortable in the hand and the thread is fun - when screwing on and even unscrewing again. Most people will be familiar with it, cheap filters like to stay in place. The optical performance, which is ultimately important, is great. Reflections are skilfully filtered and there is also no distortion of the actual image. The look that is created is simply great. When you do some magic in post-processing, photos of cars simply look amazing, a completely different level. I can therefore make my recommendation without hesitation.

The filter is packaged in a small design object. The bag is well thought out from front to back and is just as well designed. But: a lint-free hard case would be much better. Unfortunately that was nothing.

A filter is always a compromise. I put a layer between the object (light) and the lens. As a result, quality is inevitably lost. In this case, the loss is very low, which speaks for the very good quality of the glass. The reflection of the surfaces is visibly reduced.

The ambitious price matches the performance of the filter. However, I don't use the filter bag, but use a hard plastic box - as always.

I'm really no expert when it comes to filters, but of the dozen or so I own this is far and away the highest quality. You can feel the build quality the moment you screw it to the lens. It's incredibly lightweight but doesn't feel at all flimsy, and the threading allows for super smooth application and removal.

I use polarizing filters more than any other as I live in a country that has near constant sunshine, so I've had plenty of chances to test this filter since I received it. The results have been just as good as I'd expect given the price. This thing beats the pants off my cheaper filters.

As soon as you unpack it, you notice that this filter is of very high quality, as it comes in high-quality hard cardboard packaging. A very stylish and practical case is also included. The filter itself also looks super high-quality, scratch-resistant and works wonderfully!
It is very easy to screw onto the lens and also rotate it, although this is a bit difficult. But that doesn't mean it slipping either!
The price is quite high, but anyone who is willing to pay that much will have an absolute top product!