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.

As a rule, I do not write reviews that simply repeat the product page verbiage. That’s for you to read before you decide to buy. I am also getting away from what, where, when, who, and how of gizmos. I assume that if you are buying a gizmo, you know what it does and then decide if you can use it – for whatever.

For me, ND and CPL filters are mandatory for landscape photography in so far as they can accomplish what post-processing cannot. This pairing offers the best of both worlds in a single filter without introducing aberrations or vignetting except with wide-angle lenses. With my Nikkor AF-S FX lenses, I will get very slight vignetting with this combo or other stacked filters at f/4, 16mm; it disappears at 21mm. The vignetting is so slight that, if desired, post-processing readily eliminates it so there is no need to stop down.

I have used filters with film photography for decades without experiencing any of the alleged deleterious aberrations/effects. For me, digital photography is no exception. In fact, most photographers and authors agree that there is no data to suggest that filters introduce aberrations except for, possibly, ghosting. I have a few K&F filters and have never been disappointed. In other words, relax and have fun creating with this combo.

To some conflicting reviews.

Cannot use lens shade/cap – or – the lens cap fits fine. (Depends on . . ..)

Color shift – or no color shift. (Looks like one instance of underexposure to me.)

No stops between ND options – or – nice that there are no stops between ND options. (Food vs. poison)

So, a filter combo to afford one the ability to adjust/correct exposure in a variety of situations - for me, landscape photography. If you are a regular user of ND and CPL filters, then this combo might make your efforts a bit easier.

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.

I own many K&F filters. Every single one of them is well made and fit my lens like a glove. They are all made of quality materials. The optics on this lens are premium and worth every penny. Another great filter to add to my collection. If you don't have a ND/CPL, I highly recommend trying this one out. It does not disappoint.

The presentation of this filter is very good.

I find it an essential accessory for sunny days.

It has a regulation with values ​​from 1-5.

It is for a 67 lens, in my case I am going to put it on my 85 F1.8 Sony and on my 18-70 F4.

It is easy to install, since it is only threaded.

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.

A filter like you rarely find.
Careful quality with a very well-made box worthy of a jeweler.
The adjustment is done smoothly, the filter offers a wide range of adjustments.
For my part it is mounted on a 28-80L f2.8.
Extremely satisfied with the result.
Friendship, Laurent"