K&F has always been known as a company that produces fairly inexpensive gear that performs "good enough" for most non-professional situations. With this filter, it appears K&F is going after the professional shooters.

The optical quality of this filter is fantastic. I had zero glaring issues when using this outside which is something I usually run into with budget filters. There was very little color cast even when using at the higher strengths. It comes with just a fantastic high quality case.

I hope to see more filters like this from K&F. I am a big fan of really high quality gear which it seems K&F is starting to produce now.

K&F has always been known as a company that produces fairly inexpensive gear that performs "good enough" for most non-professional situations. With this filter, it appears K&F is going after the professional shooters.

The optical quality of this filter is fantastic. I had zero glaring issues when using this outside which is something I usually run into with budget filters. There was very little color cast even when using at the higher strengths. It comes with just a fantastic high quality case.

I hope to see more filters like this from K&F. I am a big fan of really high quality gear which it seems K&F is starting to produce now.

The K&F Concept 77mm Circular Polarizers Filter Super Slim with 36 Multi-Layer Coatings, High Definition Circular Polarizing Filter (CPL) Camera Lens Filter (Nano-X PRO Series):

Is one of the finest quality filters I've used. Everything about this is premium. From the packaging to the filter wallet to the product itself is top notch. It has a brass powder-coated frame and high quality, crystal clear optics. A filter I don't feel too bad putting in front of my best glass. The threads are precisely machined and screw in and out very smoothly. The CP rotation feels impossibly, buttery smooth. Like its hydraulic but it's not, it's just a ridiculously smooth action. Like a high quality potentiometer. The knurling feels very nice, and over all the whole thing feels really great in the hand. As far as the polarization effect it works as it should and as expected, and with crystal clear optics. The included filter wallet is made from suede and heavy denim, with a pull ribbon to retrieve the filter with out stick your fingers down the pouch. The whole thing is rather lux. The packaging itself is a very classy, thick black box, with gold accents. the box also turns into a picture frame. The package also contains a microfiber cloth. Overall this is a very deluxe filter. It is a bit pricey, however the quality meets the price for sure. You get what you pay for sometimes and this is one of those times. You don't want to buy top quality lenses, costing thousands of dollars, and put a cheap filter on it. This is the type of filter you can feel good using on your best lenses. Precision machining and great quality glass.

This filter and its packaging exudes quality. But of course, it all comes down to the filter itself, regardless of how nice the packaging and presentation, and this filter didn't disappoint.

I tried it out on my Nikkor 24-85 on a Nikion D800 for a few basic comparison test shots (see my pictures). The polarizer is easy to turn and feels fluid. Dialing in the right spot is pretty easy. I noticed no degrading in the image quality, attesting to its glass and coating quality.

It comes in a really nice case with a wrist strap. The box can even be converted into a picture frame... pretty clever. It also comes with a vacuum packed lens cloth, which I haven't opened yet, so I can't say how nice it is. Overall, it seems like a very high quality filter for their new flagship Nano-X PRO Series.

This filter and its packaging exudes quality. But of course, it all comes down to the filter itself, regardless of how nice the packaging and presentation, and this filter didn't disappoint.

I tried it out on my Nikkor 24-85 on a Nikion D800 for a few basic comparison test shots (see my pictures). The polarizer is easy to turn and feels fluid. Dialing in the right spot is pretty easy. I noticed no degrading in the image quality, attesting to its glass and coating quality.

It comes in a really nice case with a wrist strap. The box can even be converted into a picture frame... pretty clever. It also comes with a vacuum packed lens cloth, which I haven't opened yet, so I can't say how nice it is. Overall, it seems like a very high quality filter for their new flagship Nano-X PRO Series.

K&F keeps offering some amazing quality in both build and image reproduction. This filter does what it's supposed to and it also doesn't distort the image or color. No surprises here. What you see is what you get in an amazing package to carry it from place. Great CPL here.

K&F keeps offering some amazing quality in both build and image reproduction. This filter does what it's supposed to and it also doesn't distort the image or color. No surprises here. What you see is what you get in an amazing package to carry it from place. Great CPL here.

Yeah you pay for it, but I’ve seen filters a lot more expensive that didn’t look as nice or work as well.

After testing this I’ve seen absolutely no optical distortion whatsoever. It is a beautiful polarizing filter that is precision made as you can get. The threads are very easy to screw into the lens and the ring turns with buttery smoothness. This allows you to get any sort of Grady action you want to you in terms of polarization. This mechanism, the simple, is incredibly precise.

The glass is absolutely perfectly flat as much as I’m able to measure it. And even using the laser test I saw no distortion whatsoever.

This is supposed to have some kind of nano coating that makes it scratch resistant and also shed water much easier. I really hope not to test this.

Every filter by this company has been first class all the way. Absolutely professional quality in this one is no different. I have a $300 German made polarizer and I don’t think you can tell the difference. I also have some other expensive ones that are not nearly as good as this.

As for the German one, they look identical and they feel identical. And that’s at half the price. This company makes some first class stuff. I won’t have a reservation ever buying a K&F filter.

Yeah you pay for it, but I’ve seen filters a lot more expensive that didn’t look as nice or work as well.

After testing this I’ve seen absolutely no optical distortion whatsoever. It is a beautiful polarizing filter that is precision made as you can get. The threads are very easy to screw into the lens and the ring turns with buttery smoothness. This allows you to get any sort of Grady action you want to you in terms of polarization. This mechanism, the simple, is incredibly precise.

The glass is absolutely perfectly flat as much as I’m able to measure it. And even using the laser test I saw no distortion whatsoever.

This is supposed to have some kind of nano coating that makes it scratch resistant and also shed water much easier. I really hope not to test this.

Every filter by this company has been first class all the way. Absolutely professional quality in this one is no different. I have a $300 German made polarizer and I don’t think you can tell the difference. I also have some other expensive ones that are not nearly as good as this.

As for the German one, they look identical and they feel identical. And that’s at half the price. This company makes some first class stuff. I won’t have a reservation ever buying a K&F filter.

First off, I'm a fan of K&F's products, I try to use them as much as I can during photo sessions, since they just give good consistent results.

However, the ONE complaint I've always had, is that K&F's product line was quite limited to low to mid range products. Don't get me wrong, they are amazing for what they are.. and I LOVE having them on location. But, as with any product I use in the field, they're often NOT the same products I will used in a fully controlled environment. In a perfect world, I would be able to take all of my studio gear on location, and not have to worry about potential damage to my gear.

To that end, K&F's mid-range type of filters and equipment have worked extremely well..

However.. I've always wondered.. what if my preferred manufacturers actually produced higher end gear.. would the results be as good? Better? What might I be missing, by taking certain types of gear, over others?

When I saw that K&F was producing a 'Nano' sort of lineup, a while ago, I was excited.. but also somewhat concerned... I already had my high end filters that I would use on special occasions, and for studio work... would K&F be able to actually meet that quality? If so.. could I stop buying gear from manufacturers that I didn't want to use, due to their awful customer support practices?

When I saw this filter pop up on my recommended feed.. my curiosity got the better of me, and I had to order it.

I grabbed the 82mm version, since my primary workhorse lenses are 82mm. Sigma 24-70mm f/2.8 DG DN Art, is commonly my 'Go To', though having rented and used a Tamron 35-150mm f/2-2.8 Di III, a few times, now.. and having it on my wish list.. both use 82mm filters.

After using it for a couple of sessions, now... both studio and on location, I have some initial short term thoughts:

Exposure change is minimal. - This is a big deal, since so many 'cost effective' polarizers will often drastically impact exposure. I've seen some filter change the EV by as much as a full stop. At that point, a CPL is operating more like a slight ND filter, and is not really optimal if all you're wanting is glare reduction. This one, I would say reduced the EV by roughly 1/8th of a stop when installed.

Color shift also seems to be minimal, if there is any at all - CPLs are also often plagued with the problem of changing the color of a scene, when they're applied, and in the case of variable polarizers, you may even experience a color shift while adjusting the amount of filtering being applied. This isn't ideal, as it just means you're going to have to do more color adjustment in post. Now, that said, keep in mind, the way a variable CPL works, if that if you reduce the glare from a source that is producing a color cast, you WILL have some color shift. This is just the nature of light.. similar to using a gold colored reflector for a subject illumination. If you remove the gold color from the reflector, there WILL be a color change. This is not the same as a filter created color shift.

Distortion seems to be non-existent - This is ANOTHER problem that so many filters (in general) have, and can often be so slight, as to not be seen until you're working with your files (RAW or otherwise) in post. I've seen a large number of filters absolutely ruin photos in the past, so it's something I tend to be VERY twitchy about. This filter seems to have no distortion at all. I'm EXTREMELY happy for that.

Quality & build - This filter has 2 parts to it. When I say that, I don't mean there's 2 physical parts that you have to attach... just that there is the static mount, that attaches to the end of the lens, and the adjustable portion that floats and rotates on the end. The static mount is actually a bit on the small side, which means if you are going to be attaching this to your lens, with any bit of snugness, you may want to use a filter tool for it.

NOTE: This filter does NOT have a forward facing threaded mount. If you use a lens hood that attached via the filter threads, it WILL NOT WORK with this filter. Additionally, the lack of a forward thread also means you cannot stack this filter with others, OR you will want to use it as your last filter in the stack. I know.. there is some photographer out there, right now, reading this, who is screaming that you shouldn't stack filters, ever.. but you saying that, doesn't change the fact that there ARE those that do. If you DO still want to use the CPL as a middle filter, you're going to need to get some external mount adapters to do so.

Case - The case the filter comes in, is actually a nice little leather and denim case, with a pull string on the side, that will push the filter out for you. My only gripe with this case, as with so many others, is that it'd be nice if the case had a small insert for a label. When carrying around a kit of filters, and you're operating in lower light conditions, it's often a pain to read the edges of the filters to determine which one you're grabbing. Adding a small label pouch would be an awesome addition.

Un-important - The packaging of the filter is quite nice, having a sturdy foam framed box, and including a microfiber cloth is a nice touch. The fact that the box turns into a 'picture frame' is gimmicky, and borderline insulting, as if the average person buying this were a child, who may become super excited over using a dense foam-board package as a photo frame. It's a $180 lens filter... the person buying this isn't going to spend that, and then not buy a decent frame for any photos they produce. This sort of marketing gimmick might work for those individuals buying a $20 CPL for their instagram photos.. but this filter is clearly aimed at the higher end photographer.

So.. that brings us to the big question.. how are the results? Honestly, I can't find a reason to complain at all. Colors come through as expected, no distortion, and absolutely no image reduction. The smaller mount point on the front lens element keeps flaring down to a minimal, and produces nice, crisp fantastic images.

The variable polarization works as expected, but I would have liked to see it spread a bit more evenly around the lens. Right now, when I turn the adjustment ring, there seems to be an awful lot of lack of polarization for a good amount of the filter, before the polarization kicks in, quickly.. a more gradual approach would have been preferred, BUT, that's nothing different from the current high end CPL I'd been using, either.


That said, so far I'm immensely happy with the results I'm seeing with this CPL, and I'm cautiously optimistic that my long term experience will keep me comfortable with this CPL... time will tell, but for now, I'm cautiously recommending it, even at its current price.