I have been a B+W filter customer for years. I like their products but way too expensive.

I recently switched to K&F because of their price/performance ratio.

Their Black Diffusion filter is the one I got recently. Overall, I like this filter. It gives my photos a cinematic look. Yes. This filter will degrade the sharpness a bit, which is the purpose of this filter. The color will be a bit washout and soft.

The frame is very thin, but the textured design makes it easy to remove the filter from my lens.

As for the quality, please check my photos and you can judge for yourself if this is the right filter for you.

I have tried, and own, different grades of black diffusion filter. I think for its subtle effect, this 1/8 filter is my favorite. The smooth look, and highlight diffusion that you get with these filters, is either an acquired taste, or a specific characteristic that you're looking for in your shots. I personally don't use them all the time, but it is nice to bloom the highlights in certain scenarios. The 1/8 filter is very subtle in the daylight, but I found excels at night. You can of course, use it with decent effect during the usual golden hours, as the intensity of the highlights then, may be more visibly changed by this filter, photographically. In the daytime, with the sun right above you, it's hard to notice much of a difference. For video, it does an interesting effect, and may be something that you can apply to specific scenes, or just to unsharpened some of the digitized look from most cameras. Quality of the filter is very nice, made of good materials, and with nice coatings. It comes well packaged, in your standard plastic case, as well as included sealed microfibre cloths. It is affordably priced, and performs very nicely, for that price range. It doesn't in any way appear cheap to me, and like mentioned before, I do like the subtlety of this gradient. It's certainly good for the camera bag, and would be interesting to try with some golden hour portraiture. For video, I'd say it's limited to dreamlike sequences, and better suited for golden hour, and night time. All in all, I'm very pleased, and if you're looking for a 1/8 black diffusion filter, this one is a good choice.

Works as expected. Cleaning cloth is a nice bonus. Probably a niche item for some, I'd say it depends on taste to whether it works for your needs. Sometimes it's neat, other times I don't care for it but it's another tool in your bag to experiment with.

WHAT’S INCLUDED:
-K&F Black Diffusion Filter
-3 Cleaning Clothes

PRODUCT:
This Lens is a ½ Black Diffusion Filter. So your mist effect will be a lot greater than say your ⅛ filter for example.

The quality seems nice and you get 3 individually packaged cleaning cloths.

The frame itself is pretty thin as this is part of their Nano K Series, so the overall footprint is slim.

Unfortunately, I ordered the wrong size. I needed to order 58 and Instead, I ordered 55. Which is my fault. However, I still tried to test this filter by rigging it up on ONE of my cameras. I won't share those test photos since it's not completely accurate as I’m not using any kind of adapter to fit the lens properly, however, I was able to get enough of the desired mist effect that this kind of filter produces and it looks great. This kind of filter works exceptionally well for outdoor portraits, although some people are now using them on themselves when they are making Vlogs, and other YT videos, to soften up their skin and looks..etc

Just don’t be like me and make sure you get the correct size you need for your camera, and this will probably be a good option for you.

In terms of filters, it feels like K&F is making some good ones. This is a nice filter, and well made. The effect on this one is fairly strong, but if it's the effect you're looking for, then this is a good filter to get it. The diffusion is nice and soft, and the materials all feel good. It threads nicely on a lens, and feels like it should hold up well in the future.

The K&F Concept 77mm Black Diffusion filter is well constructed in a metal frame with knurled edges and screws easily on my Sony FE 24-105 lens. I have been using K&F black diffusion when I shoot daytime events. The diffusion softens the harsh sunlight slightly and serves as a contrast to photos shot with phones.

The 1/8 and 1/4 filters are too subtle to see. The 1/2 filter adds a nice glow. The full diffusion is pretty intense and should be used in special circumstances, like trying to mimic old Hollywood portraits shot through nylon stockings. The filter looks great in black and white photos.

I find when using the filter be careful with extreme rear source lights or harsh side-angled light - because the glow can be unnatural.

used this 52mm filter on my old classic Canon EF 50mm 2.5 Compact Macro lens to take the picture of the faux candle. I used flash with standard priority and exposure set to 1/30 second at f/16, ISO 1600. The filter came packed inside a sealed plastic bag sleeve inside a reusable plastic case for storage. The filter is machined to be well threaded and it fit perfectly onto a clear filter I have permanently affixed to my lens. The edge of the filter has grooves for an easy-on/off grip. Because it uses Black Diffusion, dialing up or down the "black" or even the "clarity" setting when opening a raw file in Photoshop can render a dramatic variability of the diffusion effect. The 18 Multi-Layer Coatings can help reduce glare from flash highlights on shiny surfaces such as glass or shiny metal. The filter gives a soft diffuse effect on the subject which is also effected by the light source used. This is a nice filter to have when you want to add some diffusion, softness or reduction of glare in photos or video. It can add an element of drama or a cinematic quality. The filter came with 3 sealed microfiber cloths to help keep it clean.

This is another quality filter from K&F Concept.
The diffusion strength 1 means the effect of blooming is very noticeable even during day time, and very strong glow for light sources at night.

It’s a good way to make your films unique and creative. With a little bit of color adjustment, the filter helps create a magical feel to the footage.

Overall I use it to create dramatic effects for some video production scenes, as well as for personal photos and videos.

This is a very nice camera filter from a reputable company. It is made of high quality optical glass with nanometer, multi-coating layers of ultra-thin and ultra-light materials. The frame is very light and small compared to the other filters I have for my camera. This is a special effects filter primarily for portraits to soften the details of your subject. This is a 1/4 diffusion/mist filter and the changes from a normal, non-filtered lens, are minimal. K&F makes this same filter in lesser and greater strengths (i.e., 1/8, 1/2). So you have to decide what diffusion level you want for your specific studio shoot/setting. I thought 1/4 was a good place to start experimenting with this type of effect. This filter also included 3 nice sized microfiber cleaning cloths. (It would have been nice if there were in a resealable/reusable bag though.) The price is very good considering you are getting a high-quality, multi-coated glass filter from a good company. In my different experimental shots, I think this filter has a lot of potential for portraits and still-life. I'm also wanting to try it out on macro shots.

For me, this is an absolute winner in terms of value for money. The filter does its job excellently, and the videos turn out great.

I have the filter on the Sony ZV-E1 with the Sony 24-105mm lens, and both the lens cap and the lens hood attach without any problems.

Filter for photos: 8/10
Filter for videos: 11/10