Complete in its own two-tone faux-leather case with locking magnetic lid, K&F are stepping up their game with their Nano-X line of filters.

This circular polarizer combined with a variable density filter (up to five stops) is built to the highest optical and mechanical standards. It's a first class filter with 28 layers of multi-coating to reduce flare and protect the surface. You won't be disappointed.

K&F are renowned for producing high quality photographic filters and the True Color variable ND (“VND”) with a strength of 2 – 32 (i.e. 1 – 5 stops) filter is no different.

I ordered the K&F VND for video work rather than stills photography where having the 1 – 5 stops is perfect for keeping the 180 degree shutter rule when I am out shooting run and gun style. The K&F VND filter negates the need to having to mess around with having to swop out several filters which is ideal for my shooting style.

The build quality of the K&F VND is superb. It is made from top quality materials that are well machined and nicely finished. The rotating mechanism is tight enough to stay in place and avoid being moved by accidental knocks but not so tight it is difficult to rotate. In addition, the rotating mechanism is really smooth, which is needed for neat transitions.

The K&F VND has a protruding tab, rather than the conventional serrated edges, which makes adjusting this filter super quick and easy. This tab means I can focus on the screen and what I am doing rather than fumbling around trying to change the setting.

In my experience all filters affect the image quality to some degree and the K&F VND is no different. The reduction in image quality is minimal when using the K&F VND for video work and it is barely noticeable, even when using the filter at the strongest 5 stop setting. One thing I will say about the K&F VND is that there are no colour casts, at any setting, so the “True color” in the product description is accurate.

At £71.99 (at the time of review) the K&F True Color VND filter isn’t cheap, and is actually priced at the higher end of the market. This is to be expected and I think it is always worth to dig a bit deeper for quality filters to maintain the best image quality rather than use cheaper and inferior filters that are going to affect the image quality and potentially render the footage unusable. Using the K&F VND I can shoot with the confidence the image quality of my footage is going to be virtually as good as using no filters at all.

Overall, the K&F True Color VND is an excellent filter and one I highly recommend for capturing video footage. It is tough and durable. It is well made and has a smooth action. The protruding tab makes changing settings quick, efficient and fuss free. Okay, it’s on the expensive side but it is definitely worth the extra and very good value for money.

Disclaimer: I am privileged enough to be part of the Amazon Vine program and as such I have the opportunity request products that I would find useful/potentially buy to road test in exchange for an honest review. I am not paid for this and all of my reviews are unbiased and based on my own experience.

This is a really well-made filter and does a great job as a variable ND filter. The manufacturer provides a strong warranty and I'm happy with the purchase.

Now, about the packaging. There's a lot of it and it can't be inexpensive. The unit comes in a very nice box. I hated tossing it away. In the box is a leather case, also well-crafted. I'd have to think that this adds a dollar or two or three to the total price. I would have been happy with a lint free microfiber bag. I would protect the filter and fit better in my case. Maybe reduce the price a bit.

Great combination of my most used filters. I do a lot of automotive works, and having a good circular polarizer is a must for cutting down on paint glare, and the ND is great for getting the shutter to slow down for panning shots.
This filter is well made with clean optics, and it screws on and off nicely.
Easy to adjust and has a good range of ND.
I take this filter everywhere now, and it's my new favorite!

I love gear that enables me to cut down on the amount of stuff that I have to bring. This filter features both ND and CPL. The knob on the side of the filter can conveniently swap between stops. The glass looks, feels and performs exceptionally. So far I'm loving the results I'm getting from it.

I've compared this nd filter along side another camera with no filter and when you bring the nd filter to the max, you can see a slight color shift. White balance ends up being a little different between the two cameras, but it's not a huge deal. Easy fix in post. Other than the color shift, the operation of the tool is easy to use. The orange tabs are easy to find and move when you want to adjust the VND. If you want to adjust the CP then you just twist the whole thing. These filters are really nice to reduce filter stacking and will cause less distortions and vignetting because there's less things in front of the lens. If you need a VND and CP in one, then this is a good filter in a decent price range.

This review is for the 2-in-1 True Color ND variable and CPL polarizing filter from K&F Concept's X series (Nano-X).

The advantage of combining dual functions of ND and CPL is the ability to quickly adjust both amount of light and polarization, usually a challenging situation faced outdoors near lakes, pools, or reflecting glass surfaces like high rise windows. The variable ND has 5 stops (ND 32, 16, 8, 4, 2) and rotates infinitely. K&F promises no "X" cross on images. The construction is AGC optical glass with 28 multi-layer plus titanium coating to reduce glare but produce true color with no yellowing.

The 77mm circular filter is lightweight and machined extremely well with an interesting orange tab on each side of the circle for fast adjustments. You grab either tab that is convenient, they both adjust the ND stops.

I was able to easily twist this onto the front of a step-up ring that I have on my Sony alpha 5100.
It's an older camera but the pictures have always been great when using the right combinations of lens and filter. I can confirm that this truly delivers the easiest experience for quickly getting a high quality image by adjusting for light and polarization in one filter.

With the proper assortment of step-up rings, your investment in this filter can pay off by using it on multiple devices you may own. To protect your investment, it comes in a nice faux leather case. This is an outstanding ND + CPL combo for quality images in many outdoor situations and the sliding tab makes adjustment so easy.

The ideal of combining these two commonly used filters into one is genius. I really like all of their filters, but the convenience of this is fantastic. Works great on my 24-70. I don't see any color shift or image degradation. Adjustments operate very smoothly. This one is always in my bag now when I go out to do landscape photography.

I've had two other variable NDs, and this one is an improvement. There is a bit of a color cast, but it's so minor that it's not bothering me, and it's relatively easy to fix in post if needed. I've not yet seen the common blue X in any images where i would have expected it. Big plus there.

One thing i would appreciate for any of the rotating ones like this is a brass thread. Sometimes filters get overtightened and a filter wrench is needed to remove them. Brass usually avoids that happening, surely realistic with the price of these. They are not priced as cheap filters.

K&F has another great product here with this variable ND and CPL filter combination. For most situations, I prefer a combo filter like this one just for the sheer convenience of it when I'm just trying to get good shots in the moment and not wanting to fiddle with separate filters. The finger tabs on the ND filter make it really easy to adjust and the filter stays in place one you get it set without having to worry about it moving around on you. The filter comes with a quality soft case that protects it well for when it gets tossed back into your camera bag. Overall, I'm very pleased with it.