This K&F Concept black diffusion filter creates a very, very cool dreamy effect while still keeping the picture in sharp focus. I'm using it with my Fuji X-T100, and I am super happy with the results. The filter screws on perfect (no issues with the body of it filter) and doesn't create any vignette-ing even when used over my UV filter.

The images I'm taking with the filter are nice and clear, but with the dreamy, slightly grainy film-like effect that mist filters like this are supposed to give. I love that I can get the effect without applying filters when editing. The filter also sort of gives a softer effect to faces, so it is great for portraits. I'm using the 1/4 filter, so the effect is gentle. The greater the number of the filter the greater the effect produced.

This filter is not one that I used to regularly carry in my bag, as I assumed it functioned primarily as a mix between an ND filter and a soft filter. But, given the chance to use it for a few days, I realized I was wrong! The 1/4 black diffusion filter (there's also a stronger 1/2 filter) is mostly used for its softening effect on faces, where it can reduce the appearance of wrinkles and blemishes. In that role, it works, although perhaps a bit too much for some photos. I shoot outside landscapes and architectural shots more than portraits, where the filter reduces glare and reflections. It's also good for throwing backgrounds out of focus more than the camera itself manages. The effect, at first glance, are subtle but they are visible in a side-by-side comparison. Mostly, there's a "glow" effect to shots that is quite appealing. The quality of the filter is high, and I use it now almost as a default on my primary 85mm and 105mm lenses. Nice filter.

I have only started buying K&F filters in the last 3 years, but there is absolutely nothing negative to say about them. I love the filters from K&F.

This type of specialty filter is a bit pricey so I usually buy the size that fits my largest lens. That jacks the price up even more, but I use adapters to enable using them on smaller lenses.

Really nice quality filter, comparable to more expensive brands. Has that black pro mist look. Softens things and gives lights a bit of glow. The he 1/4 does enough but id be curious to play with the stronger versions too.

Well made and adds a very subtle change to your photos and video that make them feel more real. Adds a light smoothness and maintains sharpness well.
Great product sold in with a solid protective hard case.

Finally a filter that gives softness to my images without neglecting the details. It also corrects small imperfections on close-ups without detracting from image quality.

I really wasn't sure of what to expect from this filter. I mean, I know what it should have done technically but I have been fooled before with poor quality results and not knowing this brand I was prepared to be let down but I certainly have not been. This filter provides a beautifully softening effect that does not so much outright blur but rather seems to maintain a decent focus while creating a very soft hint of haze. It is very delicate and is a really nice tool to have in a portrait photographer's arsenal. It also has a nice effect on candle and sharp points of lights, creating a softened hue or aura around the light source. It looks a little "dreamy", if that helps to paint the picture.

I used this filter with my primary Nikon portrait lens and I intend to continue shooting with it to learn more about it but to this point, it has been a rather exciting discovery.

I will say that, although secure enough, I do find that this filter does not fit my lense threads as precisely as I am more accustom to. Something seems off but they are not binding, so I will leave well enough alone.

I am very impressed with this filter and think it fairly priced.

Definitely recommended.

I bought this filter to remove the sharpness and the too digital look that today's cameras have. The quality of this Black Pro Mist from KeF is excellent, the result is identical to the more expensive filters from Nisi.

The effect it gives is mainly marked when we frame light sources, creates the halo of light around the main source, whether it is the sun or an artificial light.

Great for giving a vintage and particular touch to your photos / videos

As most K&F products, the build quality of this filter is quite nice. The threads are smooth, filter ring is powder coated and then optics... well, hard to say they're clear or anything since they're a diffusion/soft filter, but the picture quality is still quite good. More on that later.

The filter comes in a circular filter case that is one of the neatest filter cases I've seen! If they don't sell those as products yet, they honestly could! There are raised partial circles that allow you to place all sized filters in the case, unlike most with a foam cutout (which, admittedly offers more padding). It would be nice for the filter case to have a small sticker on it to indicate what is basically on the box--"NANO series 52mm MRC Black Diffusion 1/4" in my case. In fact the outer box has that listed a few different times, including twice on the sticker label... one on the case would be even better.

The optics look like a clear glass with a bunch of small grey dirt specks. That is the intended design. The effect it creates is a soft diffuse glow; a bloom effect. The contrast is lowered when using this black diffusion filter and overall it looks like a similar effect to a soft filter. The sharpness at the point of focus isn't too affected though, so it can still be used in portraiture as well as in other creative photography. Light sources will bloom when looking through this filter. I find the 1/4 strength to still be quite useful while the 1/2 an 1 may be more niche.

I got this to use with my Fuji xf 35mmf1.4 (55mm thread) I love the vintage look I can achieve with it. Think smoky barroom, portraits behind a candle, any photo where you might want a little extra glow from the lights. I have a much more expensive 72mm pro mist filter, but this one gives me just the look I want when combined with the magic of the xf 35 1.4. Recommended