[Glass] Really loving this variable ND filter and how much it has expanded my opportunities for photos out on the ocean!

[Solid ND] 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!

[Solid ND] I was very surprised at the results of this filter. I wasn't expecting much based on it's price (sale price especially), but when I tested it, I noticed virtually zero difference in sharpness. I also didn't notice much of a color shift either when using it. Definitely worth the money!

[Solid ND] 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] No complaints yet.

[Glass] Works great nice quality heavy duty it seems

[Glass] Good quality glass and also very pleasing leather case.

[0.195 lb] Set your camera shutter speed, f stop, iso, and then whenever there's too much light just turn the Nano-X Pro Variable ND Filter and your picture will never be overexposed anymore!

[Solid ND] I purchased this in 86mm, it's one of the few that comes in that large a size. Solidly built, super dense, beautiful, smooth rotation polarizer, although a bit rough on the treads when screwing on to lens. Solid locking plastic case. Works perfectly. My biggest gripe is that due to pandemic supply issues it took 6 weeks to arrive from China, where K&F is made. Well worth the price when compared to multiple polarizers.

[Solid ND] 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.