77mm 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.

**If it has been useful to you, remember to vote positively in this way we will be helping each other.** :)

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.

Fast shipping filter working well, just the clp ring is sometimes hard to notice if it's on or of since there is no marking .

I purchased this filter after multiple times researching, and I am very happy with this filter. This one contains both Variable ND+CPL, which make it so easy and convenient to use, so I don’t have to switch back and forth between the 2 filters.I have only been able to play with these a few times so far but I am satisfied with them at this time. I ordered to use it on my Sony A6500 with the Rokinon wide angle lens 12mm F2.0. I have not noticed the problems more experienced photographers mention about why not to buy inexpensive filters. Before I use this filter, I noticed somewhat dull and differently exposed areas in my image (usually an underexposed foreground or an overexposed sky). By using this to shoot outdoors, it allowed me to capture vivid, realistic and surreal images and saved me lots of time from having to painstakingly post-process your photos afterward.The pictures I have taken have been nice and clear (aside from the ones that were my own fault!). These K&F ND+CPL filters are regarded as some of the best filters for landscape and travel photography as they reduce the dynamic range in high-contrast images, thus enabling me to capture more realistic and dramatic sceneries. I think they are great for learning how to use them and what effects you can get with them. Also, they protect the lens which is nice.

I use the filter on a Tokina 12-24mm wide angle and on a Canon 18-135mm here with step up ring.
The polarizing filter does what it should but with the ND filter is from 50% a "darkening" to the middle of the image. A strong black shadow becomes visible. This notorious "X" shadow in the image is but with the variable filters, in this price category, tolerable....
I have single ND screw-on filters for the above lenses up to ND 1000, there I do not have these problems.
The filter comes in a padded plastic transport box, this is perfectly suitable for safe transport.

Translated with www.DeepL.com/Translator (free version)

I took these test shots at the beach late afternoon on a very sunny day. I can see that the filter/polarizer took away any glare coming off the water, my dog's eyes are so clear with color! Very happy with my purchase.

Bought this for my 35mm f2 which I am using on a Canon RP. I wanted it for slowing down the shutter speed for waterfalls I'll visit this summer, as well as deepening the blue in skies. It works as advertised. Nice metal build quality that feels well made. I like the stiffness on the variable ND part. It stays where I set it, and so far it's working great at reducing the light coming into the camera, allowing me to use longer shutter speeds to get the flowing water effect I was after. I usually use the polarizing part of the filter on the lowest ND setting. I'm adding two photos that I think show the polarizing effect pretty clearly. There is some colour difference between using the filter vs not as well as at different filter settings (rotations). I think this is pretty standard, at least I've observed it in the polarizing filters I've used in the past. I've been satisfied dealing with colour shifting using WB and calibration adjustments on raw files in Lightroom. I don't see any degradation in sharpness. I'm pretty picky and do view files at 100%. Very glad I purchased this filter combo. Great value for the money! I'll also add that I accidentally used it once over a thin UV filter and was glad to not see any vignetting.

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 are great, they certainly work the feel premium and durable the cpl and nd combinations make this a serious bang for the money. The colors you get are great and the cpl works good. There are a few buggy things like for example if you wanted to chang the nd you would have to hold it to make sure you dont move the whole thing. That is one of my biggest frustrations about this.
besides that great combo i use it all the times for ,y wedding video and its been cluth

Since I started doing long exposures , my variable ND filter of choice was Vivitar. It's worked great over the years but I was in need of a new filter.Since I also own a K&F Concept tripod, and they've treated me well, I decided to give this filter a try. What could be cooler than an ND filter and a circular polarizer in one?! And I'm glad that I did!This filter works incredibly well. With my old ND filter, I had to stack a separate circular polarizer on top which would lead to vignetting on my widest shots. With the K&F Concept 2-in-1 filter, that no longer appears to be a concern at 18mm. At 10mm, I've noticed a very slight vignetting which is almost unnoticeable. But, it's definitely a huge improvement over filter stacking.While it may require 2 hands, this filter is very easy to adjust. It also feels well built and sturdy.All in all, this filter was well worth the money invested.