The K&F Concept filter fully surprises photographers: it is an exceptional device that will complement every photographer’s collection of accessories. It has granted me the ability to shoot using different colors of mist which was not possible before, to being able to control the exposure properly and many more. It is quite remarkable that ND, CPL and diffusion layers are combined in one filter which makes it very convenient and versatile. The build quality is good and the need for multi-coating technology for the bright color reproduction and minimizing the effects of glare and reflections is proved correct in this case. What I like most about it is that I do not have to use different filter options, in order to transform from one function to another. This filter does not disappoint anytime, whether used when taking landscapes or photos while holding the phone in portrait mode. For a beginner and even for a professional photographer It will be a perfect fit to their camera equipment, I wouldn’t have any hesitation to purchase one.

Fits my Canon 24-105L without any issues (although you won't be able to put on the hood with this on). Filter is well built, designed, and packaged. Comes with a leather case.
Filter itself also has a knob to help with dialing in the setting.
Does a great job in bright environments where you are at risk for washout from excessive lighting.
Overall, very happy with this filter from K&F.

From the moment you open the packaging, you know you've got a quality piece. I usually don't keep filter cases, but even the leather case is nice. I have a few other K&F filters, but this one just feels better. It's so nice to have a little adjustable knob to dial in the stops. Excellent piece of glass.

Quality products to buy with your eyes closed. An all-in-one that's easy to use. It features a polarizer and a variable ND filter that allows for all types of shots, from long exposures to HDR landscapes.
Used with a SONY RX100VII, it's the perfect combo for travel.
The only criticism would be the adjustment tab that sticks out, gets caught, and gets in the way in the storage case, but it's practical for adjusting exposure settings. So, there's a compromise to be made; it's up to you.

Camera lens filter, variable Natural Density, CPL and Black Mist. Helps balance sky-ground exposure, reduce reflections and soften images, ideal for landscape photography. Excellent quality guaranteed by optical glass with multiple coatings, anti-scratch, anti-dust and waterproof. Comes with a leather case for storage/transport and cleaning cloth. Be careful to choose the right diameter for your lens!

A very interesting filter, especially for its versatility. It takes up three of the space required by a standard filter. You can change whichever you prefer and adjust the light output using a lever on the side. Like all the filters I have from this brand, it's excellent value for money. I liked it. A good product.

A very practical 3-in-1 filter for photographers. The variable ND transition is smooth, the CPL reduces reflections well, and the Black-Mist effect softens the image for a more professional look. The optical quality is excellent, with no loss of sharpness. A must-have for any passionate photographer

PROS: this diffusion/nd filter is a nice addition for mt camera, excellent fr outdoor usage, fit my lens perfectly, it provides a nice smooth diffusion effect while filtering the sunlight well with the built in ND, and keeps the colours looking true to life. It also turns smoothly to adjust the ND. And i saw no X pattern at any stops.

CONS: its very expensive

Overall I would highly recommend this product to others

Filter of good workmanship and elegant and professional packaging, in addition to arriving inside a rigid cardboard box it has an elegant rigid imitation leather case to be able to carry the filter with you even when you can't or don't want to carry all the equipment, being thin it fits easily in your bag.
What I find missing are instructions for use, because it is not a given that everyone knows how to use it, or at least from the instructions I generally discover extra functions that I was not aware of and that could be useful.
The filter is applied simply by screwing it onto the main lens, in the case of my Nikon D3300 I can also cover it with the original cap without problems, while I have read in other reviews that this is not the case for all cameras.

Polarized filters help to soften contrasts especially when shooting in full light, for example at the seaside on a sunny day, but also at sunset. The fact that it is waterproof allows me to use it without fear especially on these occasions.
The adjustments are made through the side ring, but I still have to get the hang of it, because I'm sure that with use I will be able to make it perform better and better.
When switching between one filter and another the color change is not evident, but on the photos the result is obviously noticeable.
With the CPL filter instead you will work on the greater saturation of the colors and the reduction of haze and noise, reduce reflections and make the images sharper.
Obviously it is not a super cheap product, but the quality is undisputed and it is a tool that can easily give a more professional look to the photos.

The only hesitation I had in ordering this was deciding on which size but elected for 67mm which fits both my phone cage and a selection of my Fuji lenses.
As with most, if not all, K&F products, fit and finish are perfect and performance is as to be expected with zero visible aberration.
Some vignetting can be seen when using the Variable ND unless one is very precise, but this is fixable in post and a known issue with Variable ND as opposed to set stop ND filters

How I Rate

- ***** Don’t think, just buy it!
- **** Nothing to complain about, I’d spend my own money on this.
- *** Does what it should but there may be better alternatives
- ** Problems or issues encountered that outweigh any benefits.
- * Run for the door!

Whilst I do sometimes include photos and videos in my reviews, due to time constraints this will only be when I feel that doing so would serve a purpose in demonstrating how an aspect of the product works or fails.

I only order Items that I or my family have a genuine use for and as such you can be sure that they are tested in real world warts and all situations.

Whilst I did receive this item for free through the Amazon Vine program this has in no way influenced my review.