I've only tested inexpensive filters in the lower price range. I haven't encountered any problems with these filters in the lower focal length range up to 70mm. I've been able to test them myself up to 200mm and get excellent image quality with this filter. I would definitely recommend it.

Spent the remainder of the day yesterday shooting with this cpl filter optimizing both reflections and removal of the aforementioned. This is high quality kit, buy it! You won't be disappointed

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.

It fits perfectly, the rotation is smooth and easy to adjust. The imaging performance is excellent.

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.

Picture quality remains unchanged. Be careful on fitting this to your lens - slight finger tightness / torque only or there is difficulty in unscrewing - and keep undoing and 're tightening' to avoid stiction. On my next fitment, I may try a minute drop of vaseline applied with a cocktail stick to the filter thread to gauge any improvement. Recommended, but be aware. Thank you.

This filter is beautifully made, and I'm very pleased with the clarity, but I did notice a very slight color cast, which makes images shot with it slightly warmer than without. I don't think I would have noticed it if I hadn't done a very careful comparison for testing purposes, and it's nothing that can't be corrected when processing your images. Unlike color filters, the effect of a polarizer isn't easily achieved in editing due to the ability to enhance or suppress reflections, so this type of filter still has its place in digital photography, at least for now. TIP: If you need to use a filter on multiple lenses with different filter diameters, simply buy the filter with the maximum diameter you need and then use it with step-up rings on lenses with smaller diameters. This is much cheaper than buying a filter for each lens diameter.

I've been a fan of K&F Concept for a long time and own many filters. Especially in the beginning, the affordable products were a real blessing for my wallet. I simply couldn't afford expensive polarizing filters, ND filters, or adapters. However, K&F Concept impressively demonstrates with this filter series that they can also produce absolutely high-quality products. I can report that just unpacking the filters is a real joy. While this doesn't directly count towards the rating, it immediately conveys a completely different feeling than with the brand's other product series. The case also features a very attractive and tactilely designed case, which allows you to remove the filter via a flap. But now to the filter itself. I've used several polarizing filters before, but none of them have impressed me as much as the Nano-X PRO. The workmanship is simply top-notch, the weight feels solid in the hand, and the thread is a joy to use—when screwing it on and even when unscrewing it again. Most people will be familiar with this: cheap filters tend to stay put. The optical performance, which is ultimately what matters, is superb. Reflections are skillfully filtered, and beyond that, there's no distortion of the actual image. The resulting look is simply superb. When a little magic is added in post-processing, photos of cars look simply amazing, on a completely different level. I can therefore recommend it without hesitation.

The filter is packaged in a small designer object. The bag is well thought out from start to finish and just as well designed. However, a lint-free hard case would be much better. Unfortunately, that wasn't possible. A filter is always a compromise. I place a layer between the object (light) and the lens. This inevitably results in a loss of quality. In this case, the loss is very minimal, which speaks for the very high quality of the glass. The reflections on the surfaces are visibly reduced. The ambitious price matches the filter's performance. However, I don't use the filter bag, instead I use a hard plastic box—as I always have.