The Black-Mist filter makes the image a bit softer and more “flowing”. This is particularly noticeable when it comes to bokeh (background blur) and incidence of light. This makes the bokeh appear a bit softer.

However, this effect is rather subtle. The 1/4 filter is not excessively strong. Especially in focus, the sharpness remains quite high, but that's not a bad thing either.

There is nothing wrong with the K&F filter in terms of quality. The filter does what it should and is good to use as a creative tool.

Well made filter. I got the 1/4 filter in 72mm size. Great for portraits....gives a softer edge and a slight glow on the highlights.

This is subjective, but I wouldn't go any stronger on the filter strength, and in fact, you might want to consider the 1/8 strength filter. Too strong a filter like this makes your photos were taken at an '80s Glamor Shot booth at the mall...

This has become my favorite filter to use! I photograph a lot of athletes, and often put lights behind them, and with this filter, I'm able to make those lights bloom out, instead of being too sharp and harsh. Big fan!! Great quality and feel too - will be getting more of these in other filter sizes.

I have a few black mist type diffusers, including the more expensive K&F Nano-X, and even more expensive Tiffen. I bought this Nano-K series version half expecting to return it but thought it worth testing out given the much lower cost. Construction-wise it is as solid and well made as the Nano-X using the same finely machined “aircraft grade” aluminum. Screw thread is precise and smooth. K&F give very little useful information about the the actual differences between their filter series, except that the Nano-K is meant to be “basic level” compared to the supposedly more professional Nano-X and Nano-X Pro series. If you read the manufacturer’s small print, they are all made from optical grade glass from Japan, have advanced multi-coating and resistant to moisture and mold. So what about the effects performance? Again, I was prepared for disappointment. All brands of this type of black diffusion filter have subtle differences, as is well covered by numerous YouTube videos. The Tiffen for example tends to give slightly less intense diffusion for a given rating (i.e., 1/4 vs. 1/8 etc.) than the Nano-X, but both are equally good a preserving the blacks and fine detail in the mids, which is why we like them. When compared to the Nano-X, I can see no visible difference whatsoever in the image produced by the Nano-K. This was tested on a Canon C100 Mk-2 with a variety of lenses and conditions. For this reason, my advice would be, given the choice between the Nano-X and Nano-K, without hesitation get the latter. A side note: the Nano-K series appears to have been originally marketed in Germany, evident from Google searches and the small print on the packaging, i.e., GmBH, as place of origin. My conspiracy theory is that these were initially targeted for a European demographic and price expectations. Anyway, the bottom line is that here in Canada/USA they are a phenomenal bargain and not to be missed while available.

Modern cameras with good optics produce crisp, sharp photos. You can see every detail here.
No crease, scar, or impurity remains hidden here.

Especially when you want to photograph portraits, this wealth of detail is not always wanted. Unless you want to highlight the wrinkles, etc. as an artistic device.

But if you simply want to create beautiful portraits, this filter can be used. It mitigates precisely these weaknesses, if you can say so, and produces wonderfully soft - though not blurry - results. The contrast is also reduced, which simply creates more beautiful photos from hard and cold light.

The filter I have has a strength of 1/4 and is therefore the second weakest. All the effects mentioned above are therefore present, but not so strong that it appears artificial and perhaps even kittish.

Sure, you can now say that such effects can also be done in post-processing, but this filter saves you a lot of work and has a more analog workflow that I personally really like.

In any case, the filter has already proven itself and is more than worth its - low - price. Especially since there are three good cleaning cloths as a nice bonus.

I can't identify any negative points, so I can give it the full five stars here.

I received the K&F Concept Nano-K series Black-Mist 1/4 filter free of charge for testing. The product was delivered quickly and was securely packaged in a standard retail box.
The filter is well padded in a sturdy plastic box. 3 shrink-wrapped cleaning cloths are included. The filter makes a good visual impression and delivers the promised results in the image. The thread is smooth and fits perfectly. In today's fully digital age, filters have gone out of fashion, as most effects can be added digitally afterwards. For analog photographers or people who don't like to digitally edit images, this filter is highly recommended. The filter strength ¼ results in rather unobtrusive subtle results. The manufacturer describes the filter effect very appropriately. With appropriate step-up adapters, the filter can also be used on smaller lenses. Good filter. Nice effect. Good workmanship Reasonable value for money. 5 stars

The K&F Concept 72mm Black Diffusion 1/4 Filter Mist Cinematic Effect Filter with 18 Multi-Layer Coatings for Video/Vlog/Portrait Photography (K-Series)

This is a 1/4 stop black diffusion filter that lowers contrast and makes highlights glow. It’s not quite a soft focus filter, it does give the overall image a softer, dreamier and glowey effect. K&F filters are very well made and very well engineered. I have been using several of their filters recently and I rate them among some of the best in the business. These black diffusion effects are pleasing and subtle at least with the 1/4 and 1/8 stop filters. The effect gets more extreme with the 1/2 and 1 stop models. These are great for wedding, glamor and portraits, or anything you want to have a soft diffused glow to the image. Equally effective for video and photos. A fun effect to play with for added drama and vibe. Works best with scenes with lots of background highlights, or very backlit scenes. Modern lenses and sensors are so sharp that sometimes you just want a softer vibe, this is a good tool in the tool box for an instant dreamy and dramatic quality.

his K&F Concept filter screwed on smoothly to my lens, without any of the harsh turning sounds other filters made that I have tried. This filter is rather unique in my collection.

I own a lot of UV filters, but this is a diffusion filter. It produces a noticeable glow around light sources. It is a 1/4 strength filter and did produce more of a glow than another brand's 1/8 filter that I tried.

The filter itself feels thick and substantial.

You can really see the diffusion coating on the glass.

Overall, I am happy with this filter and it did what it is supposed to do. It produces a glow that is a bit

I've mainly shot landscapes, architecture and still-life images but in the past year have begun doing more people and night shooting. This lens, at 1/2 mist creates a very mild glow and softness to images without sacrificing detail. I've added a touch of glow to some people and macro flower images in post processing, but using a filter to get the effect in-camera produces a much more subtle and natural look.

The filter itself is extremely well made, attaches to my lens smoothly and easily and is just as easily removed. Optically, it's spot on and produces no distortion or unwanted artifacts.

K&F filters are every bit as good as the significantly more expensive German filters I've purchased and this is now my go-to brand.

The filters from K&F Concept are rated here. The filters are used together with three cleaning cloths for objective lenses or filters.
The filter fits my Sony Alpha 6400 with 3.5-5.6/18-135mm lens. With a little sensitivity, the filter can be easily screwed onto the lens and then sticks firmly.
The main purpose of the filter is that the light has significantly softer transitions and edges than without it.
However, this is the lowest level, so the differences are really only minimal.
In principle, the packaging is not quite as practical, as the filter must be repeatedly wrapped in the plastic film and then in the plastic packaging.