Just about every lense accessory I've purchased in the last year or two has been from K&F.
Black Diffusion 1/8 - 1/4 - 1
Mist
Variable ND's
UV Filter
CPL Filters
GoPro ND's
DJI ND's
20+ Cleaning Kits

All have been top notch, Now i wouldn't know what the difference between this, and a filter thats like 10 times the ask, but these all work perfectly for me.

This lense I would describe as a very Hollywood Noire like look, Its a very heavy look. @ 1 vs the quarter and eighth
I like the texture on the filter, makes it so you dont have to fight to get the filter off

Overall everything i've bought from K&F has been perfect, and done exactly what it says for me at my experience level

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.

This filter adds a bit of Halation effect to your footage. So if that's what you're looking for this is the item!

Bueno si quieres darle un estilo diferente, tengo que ser sincero es mucho 1/4 pero da un efecto de sueño, tengo el mismo en 1/8 y de maravilla para el día y la noche.

It is much subtle compared to K&F Nano X 1/4 but it beats Nano X on colour cast as it doesn’t have one! This is the current filter I use alongside with my VND. Bare in mind mist effect isn’t as strong as Nano X series Recommended.

Honestly, the effect from this filter can be done variably with the drag of a slider in post-production without losing the original sharpness. However, if you want this exact diffusion for your work, it's hard not to recommend this one for the price.

See the photos for a couple of bright-sunlight examples. They are JPGs directly from a Sony A7RIV (via a kit lens) without any extra processing.

Very subtle effect that I feel can be done in post, I don't hate it and I can see the merit but I don't think I'll be reaching for it often.

High quality feel and fit perfectly on the 40MM Canon pancake lens. Cap fits over it nicely as well. on top of that. Nice little hardy foam lined carry case as well for storage. I like playing with different practical effects and filters but not my favorite. Soft subtle diffusion effect, classic/retro look. Maybe if you want to do soft soft retro style photos it'll have a spot in your kit.

Since the advent of digital photography, I haven't been a big filter guy... I use circular polarizers and neutral density filters to create the image - then move to software in the computer to apply the desired effects.

When given the opportunity to try K&F's Black Mist Filter - I jumped at it, as a good filter of this type can save a lot of time in post-processing - particularly when used for video.

A black mist type filter is designed to push highlights while preserving the shadows - and the effect is to create a dreamy, hazy kind of look without destroying the contrast of the image. Portrait photographers use these types of filters to help eliminate the excessively sharp image quality of modern digital photographs - and do so without making the image appear out-of-focus.

Another attribute is that it can help improve the bokeh (out-of-focus areas) so that a lower quality lens can have smoother, creamier bokeh.

The first thing I noticed was that the threads of the filter were extremely precise in fitting my step-up ring. The filter screwed on the ring with the smoothness you would expect from a high-end filter.

I took a few selfies while finding different lighting to experiment with - and I was surprised at how well it held good focus while creating the desired look. I can see myself using this in a variety of filming circumstances. All in all I'm very pleased with this filter and would recommend it to anyone looking to add to their arsenal of photography tools.

I have used 1/4 and 1/8 filters but I have never seen the 1 before. If you are familiar with the look that a mist filter provides then imagine that look greatly amplified. This filter creates a dreamy like look and gives a creamy smooth appearance to the skin. It blurs background lights a good bit. It’s like adding a lot of haze to the environment you are shooting in without sacrificing all of the detail and depth.

This effect can be too much for certain situations and taste and should be used with intention. This will definitely enhance your creativity in your work.

The effect from using a black diffusion filter can be quite beautiful in the right circumstances. This filter provides that at a great price without sacrificing built quality.