I’m honestly blown away by this 1/4 Black Diffusion & Circular Polarizing 2-in-1 Filter! This instantly makes your footage look more cinematic and professional without a complicated setup.

The 1/4 black diffusion effect is absolutely beautiful. It softens harsh digital sharpness just enough to give highlights a gentle glow and smooth out skin tones, creating that dreamy “pro mist” cinematic look you see in films. It takes the edge off modern lenses while still keeping plenty of detail.

What really makes this filter stand out is the built-in circular polarizer. Being able to rotate the filter to reduce glare and reflections on water, glass, and shiny surfaces is very useful. Colors are richer, skies look deeper, and everything pops more naturally. Having both diffusion and polarization in a single filter is a huge convenience and saves space in my camera bag.

The build quality feels solid and professional, and the filter threads on smoothly to my lens. The glass is clear, well-coated, and doesn’t introduce any strange color shifts or loss of image quality.

Overall, this filter is a fantastic tool for photographers and filmmakers who want that polished cinematic style straight out of the camera. If you're shooting portraits, landscapes, video content, or creative projects, this filter adds a beautiful finishing touch. I’m genuinely impressed and would absolutely recommend it!

This lens filter is awesome! As a 2-in-1, you might expect it to be bad at one thing or mediocre at both things, but no - this works as both a CPL filter perfectly and as a 1/4-strength mist filter perfectly. All is good! It's super convenient if you have a heap of lens filters to cycle through, as you don't have to swap or mix-and-match so many while doing your shoot. Just pop on the one lens filter, get multiple things happening. Easy stuff, brilliant product. I'm very happy with this lens filter!

I primarily handle indoor product photography and high-end video, but I took this 77mm unit out for a professional shoot on a bright, sunny day near a lake. Dealing with snowy banks and harsh water reflections is a classic nightmare for exposure and contrast management, especially when trying to maintain a professional, critical eye. This filter functions by combining a true color CPL with a 1/4 black diffusion. having both in a single frame is a significant workflow improvement over the traditional stacking method.

The optical quality of the Japanese AGC glass is impressive for the price point. I used this on my LUMIX S 24-105mm and was specifically looking for the yellow or green shifts that often plague cheaper variable or stacked filters. Even with a fixed white balance, the color accuracy remained neutral, which significantly reduces the time spent on corrective grading in post. While AI powered editing tools are becoming incredibly powerful at faking depth and bloom, they still cannot perfectly replicate the way a physical CPL cuts through non-metallic glare or manages high frequency highlights at the source. Capturing that organic roll off in the highlights saves me from having to un-clip highlights digitally, which never looks quite as natural.

From a build perspective, the 28-layer nano-coating makes a genuine difference when you are in the field. It resists fingerprints and water spots well enough that a quick wipe with a cloth actually clears the glass instead of just smearing the oils around. This is essential when handling gear frequently in changing environments. The frame is thin, but you have to be mindful of vignetting. On my 24mm wide end, I noticed a slight darkening in the extreme corners, which is the inevitable trade-off of a dual purpose filter ring.

In this era of having to move massive video files, efficiency is everything. Getting the polarization right in-camera means I’m not fighting with impossible reflections in DaVinci or Lightroom later. The 1/4 diffusion strength is just enough to take the digital edge off modern high resolution sensors without making the footage look like a low budget dream sequence. For a professional work where you need to manage harsh outdoor contrast while maintaining a specific aesthetic, this piece of glass is a highly efficient tool that holds its own against brands twice the price.

I've been quite happy with this combination CPL and Black diffusion filter from K&F. It's well made and comes with a nice dedicated hard case for it as well. The 67mm filter thread is great since it's compatible with many F2.8 zooms (e.g. the Tamron f2.8 holy trinity on Sony and Nikon). The 2 in 1 design saves you having to stack filters and potentially introduce glare or reductions in image quality on your lens. The Black diffusion filters are really popular these days and does a good job helping to soften your image for a more pleasing, vintage/filmic look. I find the 1/4 grading on the K&F filters a good amount of diffusion and bloom without being overly dramatic or noticeable. I had no issues with odd reflections, color casting or glare with this. The CPL on this works well and does a good job at cutting out reflections, e.g. when shooting on the waterfront or other any high reflective surfaces like cars. This isn't cheap by any stretch but when you compared it to other options on the market this is actually very well priced. 100% would recommend!

The idea of ​​combining a circular polarizer with a Black Mist diffusion filter arose from the need to speed up the field workflow, especially when working with highly sharp and modern optics. Current sensors, when paired with high-end lenses, often produce images that are too "digital" and clinical; therefore, I was looking for a single tool capable of managing reflections on glossy surfaces while simultaneously giving highlights a more organic and mellow character.

Mounting it on a Sony 35mm f/1.4 GM lens, you immediately notice how the nanotechnology coating makes a difference in flare management. Even when aiming at lateral light sources, ghosting is minimized thanks to the extremely low reflectivity, which in practice translates into deep blacks and preserved local contrast. The transition between the polarized and non-polarized zones is seamless, without the abrupt chromatic shifts that often plague mid-range filters. I wonder if at even longer focal lengths, like a 16mm ultra-wide angle, a slight hint of mechanical vignetting might appear at the outer edges, but on the 67mm diameter tested, the profile remains sufficiently subtle.

In practice, the 1/4 Black Mist component acts subtly but effectively: it doesn't destroy fine detail, but creates a soft halo around highlights that makes the image decidedly more pleasing and less "sharp." It's an almost tactile sensation, the one you get on faces or architectural textures hit by direct sunlight.

The True Color technology seems to live up to its promises. By shifting the polarization axis, I didn't notice the yellow or green shift typical of traditional CPLs; whites remain neutral, and the sky maintains a natural saturation. The mechanical construction is precise, and the ring turns with just the right amount of resistance, allowing for micrometric adjustments without accidental movement. The glass surface is extremely water-repellent: during use, a few drops of condensation rolled off without leaving streaks, a technical detail that saves sessions in unstable weather.

It's not just an accessory, but a true light modifier that shifts part of the creative process from post-production directly to the shooting stage, allowing you to immediately visualize a finished aesthetic.

When taking photos outdoors, depending on the time of day, you can get reflections that look strange in the photos. To minimize this, a polarizing (or CPL) filter is often used. It reduces these effects, and there will also be a slight color shift depending on the angle of the light and the angle of the filter.

I bought this filter in 52mm, which fits many of my older Nikon lenses—lenses that often lack the coatings found in modern lenses.

I find the colors more pleasing with it!

Free yourself from the physical constraints of stacking two filters]
When shooting portraits or snapshot videos, there are many situations where you'll want to use both a black mist filter to softly diffuse light and a CPL filter to remove unwanted reflections.
Previously, I struggled with vignetting at the wide-angle end when stacking two filters, but since getting my hands on this product, I've been completely freed from the limitations of my angle of view.
Even when attached to wide-angle lenses like 16mm and 24mm,
I can capture expansive landscapes without any black shadows at the corners.

[Cinematic rendering with reduced color cast]

It maintains natural skin tones, living up to its True Color name, without the unnatural yellow cast often found in inexpensive multi-purpose filters.
The CPL controls the intense reflections from a car windshield, while the exquisitely concentrated 1/4 black mist effect creates soft highlights like something straight out of a movie.
It's amazing that you can achieve this level of rendering for less than the cost of a single genuine filter.

[The Fate of an Integrated, Inseparable Filter and Operational Guidelines]

However, the 2-in-1 design also poses a fatal weakness: the effects cannot be separated.

The built-in CPL mechanism reduces the light output by 1 to 1.5 stops when attached.

When you want to enjoy the black mist effect purely, such as in night photography,

this creates a dilemma: the entire image becomes unnecessarily dark.

As a versatile filter that can be used in any environment, it only achieves 50% of its expected value.

We strongly recommend keeping a separate nighttime mist filter in your camera bag and using it exclusively as a dedicated piece of equipment for daytime cinematic photography.