Been a big K&F Concept fan, ever since getting my first tripod by them, years ago. And they seem to be stepping it up a notch, over time. For one, their packaging is beautiful, on their filters and accessories, along with the little protective carry bags for them. It's like opening a box of fine jewelry, and enhances the Buyer's Experience. I like to call it, "Power In The Packaging". Very few manufacturers seem to understand that concept, and K&F gets it. Worse still, are those who give you fancy packaging, to dress up a crappy product. But you won't find that here. The quality matches. And, it's magic.
Still trying to figure out how the heck it does that, the adjustment mechanics, how it fades from clear to black. And, the way it knocks off the bright white reflections and smooths everything over, is amazing. Been in the process of rearranging my studio, and putting it all together, so I haven't produced any content with it yet, but I've tested it on some of my cameras and adapters/lens gadgets, and looked at the monitor, sat there mesmerized, adjusting it back and forth, just looking at it, and I'm in love. Can't wait to get it all set up, and put this and my other K&F filters and contraptions to work!

having two filters put together in one is absolutely brilliant! and like all the other K&F concept equipment I have, the quality of this filter is also brilliant, and top notch! This is the first "combo" type filter i have ever had and it is so dang nice to use. I tend to shoot Black and White film mostly, and this filter has been extremely useful for mid day bright sunlight shooting. There is one twist ring that dials in the ND filter, and then another ring that you twist for the polarizing. And the filter is still narrow and streamlined, it is not super thick and clunky to use. I have nothing at all negative to say about this filter, it is really well built, and is easy to use and has one of the nicest protective cases i have ever seen.

I love this variable ND filter. I'm using with a Canon R6 and a Canon RF 35mm F1.8 lens. Fit and finish is impeccable and and it's easy to rotate due to the tabs set at 180 degrees on the filter. Most importantly, I'm not detecting an cross-hatching, which is a common phenomenon on variable ND filters. Also, the lens cap fits securely on the filter, but you can't use a lens hood when using the filter. That isn't a big deal to me, but it's worth noting. This filter has stayed on the lens since I received it. Couldn't be happier - highly recommended. 5 stars.

K&F knocked it out of the park with this variable ND filter. The construction is solid and the adjustment action is smooth on the filter, I have not had any issues, at all, with it. This filter is well worth the cost if you are looking for a new ND filter.

Having a variable ND filter is nice on a sunny day as you can make a lot of little adjustments when trying to get shots without having to constantly be swapping filters. There is a bit of a learning curve for these, but once you get the hang of it, it can really change up the way you shoot. Most of the tutorials for these show you how you can get those smooth shots of waterfalls, however you can use these on pretty much anything and with this being adjustable, it replaces about five to ten regular ND filters.

Great product at a great price.

If you've ever tried to stack an ND filter and a circular polarizer, you know that it is a giant pain and usually results in a dramatic dip in image quality.

A useful workaround is to stack a normal and inverted polarizer on your lens to try to cross polarize the light coming in. It can work well, but can also be more of a pain to deal with than it is worth.

This dual filter is an amazing combo of the two most commonly used filters - the ND and the circular polarizer. Through some sort of witchcraft, they've found a way to combine both filters into one easy to use design. You can do the circular polarize and ND filter to get those beautiful images.

There is no distortion or X pattern. Color shift is minor and is on par with other high end ND filters.

I like the textured rings and heavy knob for adjustments.

I wish there was a way to have no ND filter as an option - so I could leave it on the lens all the time as a circular polarizer and then apply the ND as needed. It's not a huge deal, but would still be an awesome feature.

Great value!

Downsizing is something I've been doing during these past few months. Everything from getting rid of complicated camera setups to clearing clutter from my bedroom on a daily basis, this is just another step.

I used to carry both CPL and ND filters, however now I find that unnecessary with accessories like this that come out. To be honest, I don't find it very convenient to carry around two filters, screw and unscrew them.

i did purchase the 82mm, which is certainly larger than needed, but with step up rings that issue is eliminated.

Overall, I absolutely recommend this because it's both a great ND filter and a great CPL filter. You don't have to compromise just because it's a combo filter!

I love this filter. The CPL is accessed with the large ring, and the ND is accessed with the orange tabs. Finally, someone made it easy. The ND range is bracketed, of course. The CPL rotates all the way around. It also comes with a nice (leather-ish) case to protect it. Great design.

In short, it works very well and is a good price (currently $86). Highly recommended. It is very versatile and arguably can replace several filters in your bag.

I believe they basically layer two CPL filter over each other. By doing this, you effectively get a CPL and a variable ND4-ND64 (2-6 stops) filter in one.

The operation is smooth, solid, and natural. The CPL is operated as usual by twisting the filter. The ND effect is separately operated using the orange tabs. Very easy to adjust both on the fly. The ND filter has stop markings, which helps with precision. Be sure the filter is securely attached to the lens because the filter operation is quite firm and adjusting the CPL/ND might loosen the filter from the lens if it is not secure. I appreciate the "gear teeth" grip on the filter itself for attaching to a lens. It makes it really easy grip the lens to both get it snug on the lens and also remove from the lens.

The build quality feels very good and solid. It comes in a nice looking pouch, although I would have preferred a more airtight container.

Image quality is very good. Vignetting is within normal and acceptable ranges, and it is much better than stacking two separate CPL filters or using separate CPL/ND filters.

I'm just an enthusiast, not a professional. That said, I think this is a terrific filter to keep in the bag because of the overall quality and versatility.

Not many variable ND and CPL combined filters on the market. Both VND and CPL needs to turn the filters to adjust. Sometimes you just need ND or CPL. But you still need to make sure the other function is not in the way. Also image quality degradation is a potential problem due to more layers of glasses. But it is very convenient that I can take photos of waterfall in a low shutter speed without the glare from the water. So I am prepared to take the hit on image quality while enjoying the convenience. It turns out quite acceptable. I don't see any color cast or vignetting. The rotation resistance is good on both functions.

The other feature catches my eyes is the case. It comes with a very nice leather case. You slip the filter into the case. Then, you pull an orange ribbon on the side to pull the filter out of the case. Very innovative.

Overall, this is a good quality filter from filter itself, case, to packaging. The price is quite competitive, too. You may want to give it a try.

I am obsessed with this filter. The fact that it’s an all in one just got me. I use it on my 50mm lens on my Canon R6 and my pictures turn out so crisp! I love that I don’t have to unscrew it to put a different one on — just twist and you’re good! Very impressed with this.