bought this filter for my 50mm Canon 1.8 (49mm diameter). I decided to buy it to protect the lens from scratches and dust and to have a higher contrast in the photos. The purchased filter fully copes with these tasks, in addition, the materials are resistant and the price is very competitive compared to filters from other brands. I recommend buying.

The K&F Concept 49mm Circular Polarizing Filter with Filter Cap Optical Glass Ultra Thin Polarizing CPL Polarizer Filter with 24 Multilayer Coatings for Camera Lens (D Series) is well made and feels like good quality. It's a great product for the money.

At 49mm, the filter is perfectly adapted to the Fujifilm X100 V/VI (assuming you have a suitable one, of course). It seemed to me to be of very good quality and comes with a strap and a protective cap, which will come in handy since the original lens cap of these cameras does not fit a filter. We will not use a polarizing filter under any circumstances, but for the sky, macro or portrait shots, it can give interesting results. porte-filtre adapté At 49mm, the filter is perfectly adapted to the Fujifilm X100 V/VI (assuming you have a suitable one, of course). It seemed to me to be of very good quality and comes with a strap and a protective cap, which will come in handy since the original lens cap of these cameras does not fit a filter. We will not use a polarizing filter under any circumstances, but for the sky, macro or portrait shots, it can give interesting results.

I've been using many K&F filters in the past and I have no issue with their filter.
This one is also perfect for 49mm lens. UV filter I use is to protect the lens, and this does good job.
No image distortion has been noticed.
Highly recommend for good lens protection.

The K&F Concept 49mm MC UV Lens Protection Filter is well made and easy to use. Feels lightweight but great quality. It’s a great product.

The K&F Concept Nano-X True Color ND Filter 49mm Polarizing Filter&ND2-ND32 arrived quickly.

It is very neatly and safely packaged.

The filter is of very good quality. Very high quality materials. Great workmanship.
The settings can be adjusted continuously using the small red handle on the edge.

With its 49mm, it fits exactly on my kit lens. If you have lenses with a larger diameter, you should choose a correspondingly larger filter.
I still have to practice using the filter correctly. But I am already very impressed.

The 49mm ND filter came in a typical filter case along with three pieces of microfiber cloth.

The filter looks well made. Clear markings on the filter and so easy to rotate and set it to the desired setting. It is easy to mount the filter onto the lens and remove it. The lens cap fits over the filter just fine.

I shot quite a few images, the light gathered by the lens is reduced as the filter ring is rotated to a higher stop. Happy with the results for occasional use. I can use this filter for long exposure to get say motion blur. My initial review with some shots of the trees showing the light reduction got rejected and so not including them this time.

I bought these filters for my Nikon 49mm, and the result is really excellent. First of all, I found the packaging really well done, quality product. As for the filters, the system that holds them together is very reliable, protects the glass well and allows good portability in our photo travels. Personally, I found the lens really excellent as the quality and the final result. I recommend it to everyone from beginners to professionals because the performance is really great.