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.

Hello everyone, as a Vine tester, I had the opportunity to try the K&F Concept 58mm ND2-32 variable, CPL polarizing, and 1/4 Black-mist filter. This filter is a true 3-in-1, combining a 1/4 black diffusion filter, a circular polarizing filter (CPL), and a variable neutral density filter (ND2-32). This is a considerable advantage because it eliminates the need to handle multiple filters, making it much easier to use.
Not having the chance to enjoy a beautiful sunny day for this test, I had to resort to studio lighting. I used a 16mm lens with a f/1.2 aperture and a very low ISO to best assess the quality of the light filtration. Obviously, a test in direct sunlight would have been ideal to push the filter to its limits, but the conditions weren't right for it. Despite these limitations, I was able to appreciate the filter's high-quality construction. It's made of high-quality optical glass with a 28-layer Nano-X coating, making it dust and water resistant. Its CNC-machined aircraft-grade aluminum frame provides good friction for easy installation and removal. Controlling the ND value is easy thanks to a small handle, and the frame ring allows for CPL adjustment. Furthermore, the frame structure limits black cross phenomena, especially with lenses larger than 35mm.
This filter promises to reduce post-production work thanks to its precise control of light entry and the elimination of reflections. It offers a range of 1 to 5 f-stops (0.3 to 1.5 stops).
The price of this filter may seem high, but it's average for this type of product. The main drawback, in my opinion, is the inability to attach a lens hood. This can be a deterrent for some, especially outdoors.
In conclusion, I'm a passionate enthusiast and always on the lookout for innovative products. This K&F Concept filter seems promising, although testing in real-world natural light conditions is necessary to fully assess its potential. Its build quality and versatility make it an interesting tool.