62mm ND2-ND32 (1-5 Stop) Variable ND Filter and CPL Circular Polarizing Filter 2 in 1 for Camera Lens No X Spot Weather Sealed

It is a variable ND filter and polarizer.
The ND is 5 steps, there are double, 10 steps (ND1000, 1024 to be exact).
The polarizing filter eliminates reflections of light on surfaces, cars, water, glass, and also reinforces the colors of the sky, leaves, asphalt, etc... (for more info search the internet)

Personally, I use it for video, so as not to lose depth of field by closing the diaphragm (f9 onwards, now I can go to f2.3 without burning the frames due to excess light). It's been a while since I took it off my 35mm, I'm delighted.

The filter is made of metal and glass, presented in a hard plastic case for storage. The protection and anti-reflection layers of a greenish color are appreciated and you can put your finger on it, which holds up quite well without staining.
The lever modifies the density of the filter, and the other ring moves the polarizing filter. You have to pay attention to this because it is possible that you inadvertently move both.

In the images you can see the filter attached to an adapter, (step-up 49mm to 67mm) this is so because I have 67 and 49 filters, my advice is to buy large filters and then "step-up" adapters.

About image quality. Well, excellent: there are no dominants, no chromatic aberration, no loss of definition or the terrible X of Gradual ND filters.
I have a very expensive polarizing filter and I hardly notice the difference over this one.

As a negative point, although I already said it, be careful when manipulating one of the rings so as not to move the opposite.

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I purchased one of these filters to try it out because I was tired of stacking a fixed ND & a CPL filter.
I fell in love with the results & bought 4 more in various filter thread sizes so that all my lenses had one of these CPL+VND filters available without the need for a step up ring.
100% worth the investment for both photo & video of automobiles or really anything that would benefit from having this level of control over both your ND & CPL at the same time.
I use one of these filters for LITERALLY every single outdoor daytime shot not, EVERY SINGLE ONE WITHOUT FAIL.
Can't say enough good things about these filters for my line of work!!!
& yes, I paid out of pocket for all the filters, not sponsored.

52mm ND2-ND32 (1-5 Stop) Variable ND Filter and CPL Circular Polarizing Filter 2 in 1 for Camera Lens. What can I say about it? Exceptional. Having the ability to simultaneously adjust the ND filter and polarization without swapping out filters is super convenient. Quick adjustments can make a big difference in whether you get that perfect shot or video pan in the moment. I have a Sony ZV-1 with a 52mm adapter for lens and it seamlessly and smoothly threads on without issue. Although my camera come with a build in ND filter. The K&F takes it even further by along more control of how much light my camera takes in. The polarization aspect of the K&F further expanses on the quality of the picture. Overall, I’m extremely happy with this product.

These aren't the absolute, top-of-the-market ND or CPL filters. However, the difference between this and the absolute high-end ($200+) would be minimal. What makes this filter unique is the fact that it consists of both an ND filter and a CPL filter encased into one.

Having that simplicity is worth the price. Having to screw two different filters on your camera lens can get finicky. You're sure to get your money's worth for this filter.

I'm curious to see what k&f conceptr does in the future. So far, they're doing fantastic. I would definitely recommend this if you want the best of both worlds.

A very handy variable neutral density filter.

The build quality of this filter is equal to any that I’ve ever seen. The turning ring is very smooth and there’s enough to get a grip on but it’s still surprisingly narrow so it doesn’t really interfere with your lens. It’s hardly thicker than a single stage filter. The precision machines threads are also smooth and it goes on without any issues whatsoever.

I am definitely impressed that they’re able to produce a filter of this quality at this price. If you’re looking for a variable ND ,this is a very viable option.

Works great especially for video. Thanks

Good packaging, works as described

The quality of material is really good, the filter made a lot of difference regarding picture quality and it's really worth it.

Perfect, no aberration, but slight vignetting, just mentioned on the corners at ND32

Works better than I had hoped. It works so well I bought another one for my other lens.