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.

These pictures were both shot with an 1.4 aperture in the middle of the day at a shutter speed of 400. Normally to use F1.4 during the day I essentially have to max out my shutter speed just to get something semi usable. And even then the exposure is usually blown out. But with my shutter speed not even half way maxed out I’ve got a completely usable photo that with room to further fine tune if needed. Plus I have the added benefit of having a polarizer lens so I won’t have to worry about reflections in that harsh lighting! Honestly get it. There’s no real reason not to.

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.

The K&F Concept 67mm Variable Fader ND2-ND32 ND Filter and CPL Circular Polarizing is a highly versatile, high-quality filter that offers a number of useful features for photographers.

The first thing that stands out about this filter is its ability to adjust the density of the light entering the camera, thanks to its variable range from ND2 to ND32. This allows you to control the amount of light reaching the sensor, which is especially useful in high-brightness situations, such as outdoor photography or in bright lighting conditions. By adjusting the density, you can achieve longer exposures, making it easier to capture effects such as water movement or blur in landscape photographs.

In addition to the neutral density filter function, this product also includes a circular polarizing filter (CPL). The CPL filter helps eliminate unwanted reflections and improves colors and contrast in images. It's especially useful when photographing landscapes, where it can enhance the blue tones of the sky, reduce reflections in water, and highlight cloud details.

In terms of build quality, the K&F Concept filter is made with high-quality optical glass, providing excellent clarity and sharpness in images. The smooth adjustment ring makes it easy to control the density precisely and effortlessly, allowing for quick adjustments while shooting.

It's important to note that, as a variable filter, there may be a slight degradation in image quality at the denser ends of the range. However, overall, this filter offers solid performance and satisfactory results.

Shot on iPhone 15pro, not edited. Rotated through the stops and cpl. Overall it’s a nice touch to enhance your photos.

I’ve been wanting to buy an VND filter for a while but with so many brands…. I couldn’t decide. I finally made the jump with the K&F thanks to the low price point. I thought, “ant this price I’m not losing annything. Besides I can return it if I don’t like it. let me tell you that I couldn’t be happier. The built in Polarizer gives beautiful colors as you can see in my shots above. It hardly ever leaves my lens. I bought it for my RF 50mm f1.8 and now Im going to get one for all of my lenses.

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.

It’s great to have polarized and ND in the same filter, tint it’s a little yellow but the glass quality it’s great, the coating rejects liquids very efficiently even test it filming a car video with rain and the quality of the image was really good

I’ve been using this CPL/Density filter for about a month and it is amazing. I do Inventory Photos for a few Dealerships and it does great in harsh light and balancing/removing reflections.
As far as using it on Landscapes and Portraits, it really helps with toning down highlights to give some better control in the editing and deepens some other areas of color that you often lose.
Only down side is, that I’m unable to use my lens hood for “bump protection” because you can’t use the CPL with hood. Currently using this filter on a Tamron 24-70 G2

I have owned a few filters before, having to switch them out for high stops. They will play an effect on color and image quality but with this one I don’t see a big effect on either and I don’t have to change out to get a longer exposure photo. Love it