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.

Great product! Better build quality than my Tiffen, and no nasty color cast.

These is my 2nd variable ND from K&F. The quality it's good as Tiffen and others manufacturers. Instead of have a lot of ND of different sizes it's better have a variable ND for my photography work and save same money.

The only CONS it's the protective case that came with the ND. It's nice but too big.

I bought this ND filter kit as I had good experience with K&F (the tripod is brilliant) and was looking for a system that would work with all my lenses. Firstly the quality of packaging and storage is extremely high, the glass comes in its own case keeping it clean and safe. Second, it's very easy to set up and use (a bit fiddly if your hand is cold) and third, the image quality is great, there's no color cast (the colors you see in the images above are my edit, not the error. ) of the ND filter) and it allowed me to blur the water and clouds in the middle of the day.

This K&F black diffusion filter is a great kit. It reduces contrast, makes blacks slightly grayer, and provides a soft bloom around highlights. This 1/8 filter is the weakest, but it still makes a noticeable difference to the look of the images you take with it. . I was able to test it side by side with a Tiffen Black Pro Mist filter, and the results from each filter are extremely similar to the point where I don't really see a difference in the image, and I certainly couldn't say that the one or the other is better than the other. Both frames are made from aluminum alloy, and I think any aluminum frame can benefit from a little grease, even if it's just grease from the skin of your fingers that you rub on the nets. More expensive filters have brass frames which tend to be much smoother and don't stick. The K&F filter has approximately 1.25" deep machined grooves on each side of the filter, which provides excellent grip for your fingers when screwing/unscrewing the filter. One aspect in which K&F is the clear winner is that the K&F filter housing is far superior to the Tiffen housing; the Tiffen case is a square case in which the filter is loose on a piece of polystyrene, while the K&F case is superbly designed to hold the filter in place very securely thanks to a clever system of rubber grooves which can accommodate different sizes of filters. There is a filter thread at the front so you can stack another 77mm filter on top. Overall I find this to be an excellent quality filter that is roughly on par with the quality of Tiffen filters. It's a useful tool to have in a camera kit and well worth investing in.

The ND filter is really good for the price, mine is 49mm and fits without any issue

I have both a tiffen vari ND and this one. And I like this one even better! My tiff filter has a slight bluish tint and it doesn't even turn too far. I also like that it has a hard stop and therefore doesn't have any x patterns. Quite the opposite of meeting.