Price / performance is very good. The filter works really well with my Sony A7 siii and 27-70 Sigma lens!

A 1/4 Black Mist filter with 82mm diameter is supplied. This is run on a Nikon D750 and a Nikon Z6II on a 24-70mm 2.8f G2. The filter basically fits on the lens, but cannot be screwed on smoothly. When screwing it on, it jams more often than other filters such as those made by Rollei, Gobe or URTH.

The filter itself arrives in protected packaging in pristine condition.
The strength 1/4 not quite as glowy/misty as the 1/2.

The Black Mist effect can be used variably. It works best with neon tubes or other bright lights. Really good for portrait shoots (in a parking garage, in the evening), for example. Certainly also a special effect, which is achieved by the filter. The "Black Mist" filter creates a kind of fog softener effect. I'll also use the filter at a sundowner during a portrait shoot and see what kind of pictures I can achieve there.

Apart from the not so outstanding filter thread, the filter can certainly be used well for experimental photography. Not everyone likes this effect; therefore, be careful when using the filter.

I like to use filters on my Samyang 85mm lens. Such a mist, i.e. fog filter, can provide a dreamy look. This is exactly what the product from K&F Concept does. The filter can be screwed onto my lens without any problems and also makes a high-quality impression. Especially with warm light sources, I like the look of the picture with the filter very much.
I can't see a real disadvantage. But since there are also filters with higher quality storage options, I "only" award 4 stars.

The filter performance with the reported strength of 1/4 creates subtle and just perceptible "embellishments" of the motif. Filters with a strength of 1/2 or 1/1 cause a clearer effect. The effect itself is very clear and realistic with the available filter levels in the product illustrations. Definitely recommended for occasional use in order to directly change the image effect and message accordingly. Of course, this also works for still images during post-processing. Therefore, the filter is probably intended more for videography, where a corresponding result is not so authentic or can only be produced with effort in post-processing.

As a target group, I imagine wedding photographers who, with the soft effect (it is advertised as "dreamy" to match the occasion), directly achieve an acceptable result without complex post-processing in e.g. B. Photoshop, Lightroom or similar image processing.

Nature and portrait photographers could also enjoy the filter to achieve a corresponding look.

With a Pentax K-70 and a Pentax-DA 16-85 1:3.5-5.6 ED DC WR, I tested the filter on 4 different subjects and under 3 usual exposure situations, and I confirm the advertised filter effect.. As a

result the bright areas are especially softened, while the focus remains unchanged.
In slightly darker recording situations, it becomes apparent that e.g. B. a candle flame gets a glow, while the other image elements are only slightly softer or displayed with less contrast.
Glittering backlighting in water drops is also softened pleasantly, while the shadows look a bit brighter. A depth of field that is already effective is softened more finely overall.

I imagine taking pictures in the twilight or with nocturnal lighting comfortably with the filter.

The filter causes no visible color cast, no image distortion and can be used for the intended purpose without hesitation.

The only criticism is that the lens loses some of its sharpness when the filter is attached, but this is only clearly visible when the 100% view is enlarged.
So if you don't take photos professionally and demand the corresponding fee for your work, but occasionally use the snap box for the fun of it, this filter should be sufficient for inexpensive experimentation.

Of course, anyone who knows and uses the Black Mist effect appreciates it.
The coating makes a high-quality impression and, as it should, does not negatively affect the image quality. The processing is also convincing, the thread seems stable and well made, with a lens with an 82 mm thread (Sigma 85 1.4) the filter holds perfectly.
The 1/4 variant has the best combination of the everyday effect that still looks natural and not too strong.

The filter is supplied in a plastic box. The part consists of metal (frame) and glass. The workmanship is very good. The specifications of the filter are written on the frame.
The effect of the filter is rather subtle and looks nice.
The filter also physically protects the lens from damage.
The price of the filter is still ok and recommendable!

Very simple and classic packaging for photographic filters.
If you're reading this review, you probably already know what this filter is for, so I'll let you know about its quality right away.
The filter consists of a very solid aluminum ring and the glass part is also very solid, waterproof and scratch-resistant.
A little tip if you're just getting into the world of filters is to take the size of your larger lens and then buy filter adapters so you can use them with smaller diameter lenses.

The supplied diffuser filter arrives well packed in a small box undamaged. The processing is clean and it is used to soften the light a bit.

I have to say, compared to expensive branded products, the filter does a good job and seems like a really cheap alternative.

Screwing in was easy and the filter holds without wobbling. As with most filters, you have to experiment a little in which circumstances it should be used, depending on the light it can be that the image is otherwise oversaturated.
But once you get the hang of it, you get a very nice effect, such as a warmer, atmospheric atmosphere or softer skin in portraits.

I am satisfied with the filter and would recommend it. It does its job and is a cheap alternative for every hobby photographer.