[Aluminum] The K&F Concept Nano-X Filters are well made. I've purchased two 67 mm and one 77 mm and all three fit my lenses perfectly. Optically they have no practical effect on image resolution or light transmission and produce no added glare. These are well-made, reasonably priced filters with exceptional optical performance. It's amazing how much multi-coating technology has improved in the last decade and K & F seems to be fully competitive with the best filters available anywhere.

[Aluminum] I purchased a Nikon 500mm f5.6 and this filter to protect it. This filter does not interfere with the lens hood and the lens cap snaps into it fine. I liked the high light transmissiveness for the price.

[Aluminum] A filter like this is a MUST HAVE if you want to level up how your images (for photography and video) look in broad, intense daylight in one fell swoop.

They reduce the overall amount of light coming in the camera so you can stop down for a beautiful optically blurred out background and heavily reduce intense sunlight reflections, virtually adding dynamic range in daylight. I knew this would help my shots but my jaw dropped when a got the footage back from testing locations for a project, with and without. (attached photos are screen grabs of video. Shot on Sony A74, Sigma 24-70 f2.8) *Note: This is my first ND filter and first polarizer.

My testing has found a slight cyan cast in the area where sunlight can hit the lens where shadows can be seen, it looks almost dreamy and I kind of like it, but not perfectly color preserving. With Nano-X Pro, I have not encountered any dark X pattern no mater how I adjusted it, which is far better than most Variable ND + Circular Polarizer filters on the market. The included pouch is made of materials that feel great in the hand and its pull tab that makes the filter rise out of the pouch is a very nice touch that makes me wish K&F Concept included this pouch with more filters and also sold separately. I want other filters in these things! (Wile they do sell other pouches. They do not sell the ones included with these filters.)

If you are on the fence and don't have a ND or polarizer, just get it. It took a while for Polar Pro to finally release something like this, and the price of this one STILL undercuts it. If you are a videographer/photographer, image quality is super important and this is a fantastic tool to help you properly expose your shots. There is a reason why Directors of Photography have built in ND filters on their wish list for their cinema cameras and this is why, it makes their job so much easier and allows them to focus on building the look that they want.

[5.7 x 5 x 1.7"] I am a film photographer and I bought this for my Pentax f/1.4 50mm lens to shoot long exposures of waterfalls. For such a low price I was prepared for problems but all of my images were beautiful and consistent, no difference in picture quality at different exposure times and different lighting conditions. The fact it is waterproof was greatly appreciated since the spray radius off some of the falls was quite impressive. Overall very pleased especially for the price, I would def buy from this brand again.
Good to note: I primarily shoot black and white, and the only color shots I took with this filter were at night, so I can't really speak to how it might affect colors. What I did shoot looked accurate and I don't see any discoloration.

[Aluminum] If you're looking to try long exposure on a budget, this is a very solid buy.

I bought this for a first attempt at long exposure waterfalls and I am immensely pleased, especially with the price point. I shoot black & white so I can't comment on any possible color aberrations, but all of my shots are clean and sharp. It took getting sprayed by waterfalls in the middle of winter very well, cleans easily and threads smoothly. Best paired with 100 speed film on bright sunny days, it only took me down to 1-2 seconds with 400 speed.

[5.7 x 5 x 1.7"] Works great with Leica D-Lux 8

[0.465 lb] Well made, does exactly what an ND filter should.

[0.465 lb] That K&F Concept filter is really excellent stuff, in the range with famous Hoya filters for amateurs. Filter for 21. century photo-, film- and video-enthusiasts!

[Aluminum] I got fed up with threaded filters jammed together, such as when combining a CPL with an ND. Magnetic filters also save me precious time when preparing a shot in rapidly changing light.


I looked into all the magnetic systems available and chose K&F on the basis of selection and cost. Optical quality is right up there with threaded filters for which I'd paid much more. I am using K&F magnetic in 49, 52, 67, 77 and 82 mm sizes.


K&F has two magnetic adapter base rings. This model is an open ring. The other selection is a base ring fitted with a protective U.V. filter (rear side threaded, front magnetic flange). When in adverse conditions I switch to that, but for most use I have only these open rings on my lens, adding my CPL and NDs as desired.

[5.7 x 5 x 1.7"] Bought specifically to use with my GF lenses for the Fuji GFX 50r. Truly does give a more filmic look right to the RAW files. Great for back light and creating natural lens flare. Skin texture is lovely as well.